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Publisher: John Wiley and Sons   (Total: 1577 journals)

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Showing 1 - 200 of 1577 Journals sorted alphabetically
Abacus     Hybrid Journal   (Followers: 12, SJR: 0.48, h-index: 22)
About Campus     Hybrid Journal   (Followers: 5)
Academic Emergency Medicine     Hybrid Journal   (Followers: 64, SJR: 1.385, h-index: 91)
Accounting & Finance     Hybrid Journal   (Followers: 46, SJR: 0.547, h-index: 30)
ACEP NOW     Free   (Followers: 1)
Acta Anaesthesiologica Scandinavica     Hybrid Journal   (Followers: 49, SJR: 1.02, h-index: 88)
Acta Archaeologica     Hybrid Journal   (Followers: 148, SJR: 0.101, h-index: 9)
Acta Geologica Sinica (English Edition)     Hybrid Journal   (Followers: 3, SJR: 0.552, h-index: 41)
Acta Neurologica Scandinavica     Hybrid Journal   (Followers: 5, SJR: 1.203, h-index: 74)
Acta Obstetricia et Gynecologica Scandinavica     Hybrid Journal   (Followers: 15, SJR: 1.197, h-index: 81)
Acta Ophthalmologica     Hybrid Journal   (Followers: 5, SJR: 0.112, h-index: 1)
Acta Paediatrica     Hybrid Journal   (Followers: 56, SJR: 0.794, h-index: 88)
Acta Physiologica     Hybrid Journal   (Followers: 6, SJR: 1.69, h-index: 88)
Acta Polymerica     Hybrid Journal   (Followers: 9)
Acta Psychiatrica Scandinavica     Hybrid Journal   (Followers: 35, SJR: 2.518, h-index: 113)
Acta Zoologica     Hybrid Journal   (Followers: 6, SJR: 0.459, h-index: 29)
Acute Medicine & Surgery     Hybrid Journal   (Followers: 3)
Addiction     Hybrid Journal   (Followers: 35, SJR: 2.086, h-index: 143)
Addiction Biology     Hybrid Journal   (Followers: 13, SJR: 2.091, h-index: 57)
Adultspan J.     Hybrid Journal   (SJR: 0.127, h-index: 4)
Advanced Energy Materials     Hybrid Journal   (Followers: 26, SJR: 6.411, h-index: 86)
Advanced Engineering Materials     Hybrid Journal   (Followers: 26, SJR: 0.81, h-index: 81)
Advanced Functional Materials     Hybrid Journal   (Followers: 50, SJR: 5.21, h-index: 203)
Advanced Healthcare Materials     Hybrid Journal   (Followers: 13, SJR: 0.232, h-index: 7)
Advanced Materials     Hybrid Journal   (Followers: 255, SJR: 9.021, h-index: 345)
Advanced Materials Interfaces     Hybrid Journal   (Followers: 6, SJR: 1.177, h-index: 10)
Advanced Optical Materials     Hybrid Journal   (Followers: 5, SJR: 2.488, h-index: 21)
Advanced Science     Open Access   (Followers: 5)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17, SJR: 2.729, h-index: 121)
Advances in Polymer Technology     Hybrid Journal   (Followers: 13, SJR: 0.344, h-index: 31)
Africa Confidential     Hybrid Journal   (Followers: 19)
Africa Research Bulletin: Economic, Financial and Technical Series     Hybrid Journal   (Followers: 12)
Africa Research Bulletin: Political, Social and Cultural Series     Hybrid Journal   (Followers: 9)
African Development Review     Hybrid Journal   (Followers: 35, SJR: 0.275, h-index: 17)
African J. of Ecology     Hybrid Journal   (Followers: 15, SJR: 0.477, h-index: 39)
Aggressive Behavior     Hybrid Journal   (Followers: 15, SJR: 1.391, h-index: 66)
Aging Cell     Open Access   (Followers: 10, SJR: 4.374, h-index: 95)
Agribusiness : an Intl. J.     Hybrid Journal   (Followers: 6, SJR: 0.627, h-index: 14)
Agricultural and Forest Entomology     Hybrid Journal   (Followers: 14, SJR: 0.925, h-index: 43)
Agricultural Economics     Hybrid Journal   (Followers: 45, SJR: 1.099, h-index: 51)
AIChE J.     Hybrid Journal   (Followers: 30, SJR: 1.122, h-index: 120)
Alcoholism and Drug Abuse Weekly     Hybrid Journal   (Followers: 7)
Alcoholism Clinical and Experimental Research     Hybrid Journal   (Followers: 7, SJR: 1.416, h-index: 125)
Alimentary Pharmacology & Therapeutics     Hybrid Journal   (Followers: 34, SJR: 2.833, h-index: 138)
Alimentary Pharmacology & Therapeutics Symposium Series     Hybrid Journal   (Followers: 3)
Allergy     Hybrid Journal   (Followers: 50, SJR: 3.048, h-index: 129)
Alternatives to the High Cost of Litigation     Hybrid Journal   (Followers: 3)
American Anthropologist     Hybrid Journal   (Followers: 135, SJR: 0.951, h-index: 61)
American Business Law J.     Hybrid Journal   (Followers: 24, SJR: 0.205, h-index: 17)
American Ethnologist     Hybrid Journal   (Followers: 89, SJR: 2.325, h-index: 51)
American J. of Economics and Sociology     Hybrid Journal   (Followers: 27, SJR: 0.211, h-index: 26)
American J. of Hematology     Hybrid Journal   (Followers: 33, SJR: 1.761, h-index: 77)
American J. of Human Biology     Hybrid Journal   (Followers: 12, SJR: 1.018, h-index: 58)
American J. of Industrial Medicine     Hybrid Journal   (Followers: 16, SJR: 0.993, h-index: 85)
American J. of Medical Genetics Part A     Hybrid Journal   (Followers: 16, SJR: 1.115, h-index: 61)
American J. of Medical Genetics Part B: Neuropsychiatric Genetics     Hybrid Journal   (Followers: 4, SJR: 1.771, h-index: 107)
American J. of Medical Genetics Part C: Seminars in Medical Genetics     Partially Free   (Followers: 6, SJR: 2.315, h-index: 79)
American J. of Physical Anthropology     Hybrid Journal   (Followers: 37, SJR: 1.41, h-index: 88)
American J. of Political Science     Hybrid Journal   (Followers: 262, SJR: 5.101, h-index: 114)
American J. of Primatology     Hybrid Journal   (Followers: 15, SJR: 1.197, h-index: 63)
American J. of Reproductive Immunology     Hybrid Journal   (Followers: 3, SJR: 1.347, h-index: 75)
American J. of Transplantation     Hybrid Journal   (Followers: 17, SJR: 2.792, h-index: 140)
American J. on Addictions     Hybrid Journal   (Followers: 9, SJR: 0.843, h-index: 57)
Anaesthesia     Hybrid Journal   (Followers: 125, SJR: 1.404, h-index: 88)
Analyses of Social Issues and Public Policy     Hybrid Journal   (Followers: 10, SJR: 0.397, h-index: 18)
Analytic Philosophy     Hybrid Journal   (Followers: 16)
Anatomia, Histologia, Embryologia: J. of Veterinary Medicine Series C     Hybrid Journal   (Followers: 3, SJR: 0.295, h-index: 27)
Anatomical Sciences Education     Hybrid Journal   (Followers: 1, SJR: 0.633, h-index: 24)
Andrologia     Hybrid Journal   (Followers: 2, SJR: 0.528, h-index: 45)
Andrology     Hybrid Journal   (Followers: 2, SJR: 0.979, h-index: 14)
Angewandte Chemie     Hybrid Journal   (Followers: 219)
Angewandte Chemie Intl. Edition     Hybrid Journal   (Followers: 212, SJR: 6.229, h-index: 397)
Animal Conservation     Hybrid Journal   (Followers: 37, SJR: 1.576, h-index: 62)
Animal Genetics     Hybrid Journal   (Followers: 9, SJR: 0.957, h-index: 67)
Animal Science J.     Hybrid Journal   (Followers: 6, SJR: 0.569, h-index: 24)
Annalen der Physik     Hybrid Journal   (Followers: 5, SJR: 1.46, h-index: 40)
Annals of Anthropological Practice     Partially Free   (Followers: 2, SJR: 0.187, h-index: 5)
Annals of Applied Biology     Hybrid Journal   (Followers: 7, SJR: 0.816, h-index: 56)
Annals of Clinical and Translational Neurology     Open Access   (Followers: 1)
Annals of Human Genetics     Hybrid Journal   (Followers: 9, SJR: 1.191, h-index: 67)
Annals of Neurology     Hybrid Journal   (Followers: 48, SJR: 5.584, h-index: 241)
Annals of Noninvasive Electrocardiology     Hybrid Journal   (Followers: 2, SJR: 0.531, h-index: 38)
Annals of Public and Cooperative Economics     Hybrid Journal   (Followers: 9, SJR: 0.336, h-index: 23)
Annals of the New York Academy of Sciences     Hybrid Journal   (Followers: 5, SJR: 2.389, h-index: 189)
Annual Bulletin of Historical Literature     Hybrid Journal   (Followers: 13)
Annual Review of Information Science and Technology     Hybrid Journal   (Followers: 14)
Anthropology & Education Quarterly     Hybrid Journal   (Followers: 24, SJR: 0.72, h-index: 31)
Anthropology & Humanism     Hybrid Journal   (Followers: 17, SJR: 0.137, h-index: 3)
Anthropology News     Hybrid Journal   (Followers: 15)
Anthropology of Consciousness     Hybrid Journal   (Followers: 11, SJR: 0.172, h-index: 5)
Anthropology of Work Review     Hybrid Journal   (Followers: 11, SJR: 0.256, h-index: 5)
Anthropology Today     Hybrid Journal   (Followers: 91, SJR: 0.545, h-index: 15)
Antipode     Hybrid Journal   (Followers: 47, SJR: 2.212, h-index: 69)
Anz J. of Surgery     Hybrid Journal   (Followers: 7, SJR: 0.432, h-index: 59)
Anzeiger für Schädlingskunde     Hybrid Journal   (Followers: 1)
Apmis     Hybrid Journal   (Followers: 1, SJR: 0.855, h-index: 73)
Applied Cognitive Psychology     Hybrid Journal   (Followers: 68, SJR: 0.754, h-index: 69)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7, SJR: 0.632, h-index: 58)
Applied Psychology     Hybrid Journal   (Followers: 152, SJR: 1.023, h-index: 64)
Applied Psychology: Health and Well-Being     Hybrid Journal   (Followers: 48, SJR: 0.868, h-index: 13)
Applied Stochastic Models in Business and Industry     Hybrid Journal   (Followers: 5, SJR: 0.613, h-index: 24)
Aquaculture Nutrition     Hybrid Journal   (Followers: 14, SJR: 1.025, h-index: 55)
Aquaculture Research     Hybrid Journal   (Followers: 31, SJR: 0.807, h-index: 60)
Aquatic Conservation Marine and Freshwater Ecosystems     Hybrid Journal   (Followers: 36, SJR: 1.047, h-index: 57)
Arabian Archaeology and Epigraphy     Hybrid Journal   (Followers: 11, SJR: 0.453, h-index: 11)
Archaeological Prospection     Hybrid Journal   (Followers: 12, SJR: 0.922, h-index: 21)
Archaeology in Oceania     Hybrid Journal   (Followers: 13, SJR: 0.745, h-index: 18)
Archaeometry     Hybrid Journal   (Followers: 27, SJR: 0.809, h-index: 48)
Archeological Papers of The American Anthropological Association     Hybrid Journal   (Followers: 15, SJR: 0.156, h-index: 2)
Architectural Design     Hybrid Journal   (Followers: 25, SJR: 0.261, h-index: 9)
Archiv der Pharmazie     Hybrid Journal   (Followers: 4, SJR: 0.628, h-index: 43)
Archives of Drug Information     Hybrid Journal   (Followers: 4)
Archives of Insect Biochemistry and Physiology     Hybrid Journal   (SJR: 0.768, h-index: 54)
Area     Hybrid Journal   (Followers: 12, SJR: 0.938, h-index: 57)
Art History     Hybrid Journal   (Followers: 229, SJR: 0.153, h-index: 13)
Arthritis & Rheumatology     Hybrid Journal   (Followers: 51, SJR: 1.984, h-index: 20)
Arthritis Care & Research     Hybrid Journal   (Followers: 27, SJR: 2.256, h-index: 114)
Artificial Organs     Hybrid Journal   (Followers: 1, SJR: 0.872, h-index: 60)
ASHE Higher Education Reports     Hybrid Journal   (Followers: 14)
Asia & the Pacific Policy Studies     Open Access   (Followers: 15)
Asia Pacific J. of Human Resources     Hybrid Journal   (Followers: 312, SJR: 0.494, h-index: 19)
Asia Pacific Viewpoint     Hybrid Journal   (Followers: 1, SJR: 0.616, h-index: 26)
Asia-Pacific J. of Chemical Engineering     Hybrid Journal   (Followers: 8, SJR: 0.345, h-index: 20)
Asia-pacific J. of Clinical Oncology     Hybrid Journal   (Followers: 6, SJR: 0.554, h-index: 14)
Asia-Pacific J. of Financial Studies     Hybrid Journal   (SJR: 0.241, h-index: 7)
Asia-Pacific Psychiatry     Hybrid Journal   (Followers: 4, SJR: 0.377, h-index: 7)
Asian Economic J.     Hybrid Journal   (Followers: 8, SJR: 0.234, h-index: 21)
Asian Economic Policy Review     Hybrid Journal   (Followers: 4, SJR: 0.196, h-index: 12)
Asian J. of Control     Hybrid Journal   (SJR: 0.862, h-index: 34)
Asian J. of Endoscopic Surgery     Hybrid Journal   (SJR: 0.394, h-index: 7)
Asian J. of Organic Chemistry     Hybrid Journal   (Followers: 4, SJR: 1.443, h-index: 19)
Asian J. of Social Psychology     Hybrid Journal   (Followers: 5, SJR: 0.665, h-index: 37)
Asian Politics and Policy     Hybrid Journal   (Followers: 12, SJR: 0.207, h-index: 7)
Asian Social Work and Policy Review     Hybrid Journal   (Followers: 5, SJR: 0.318, h-index: 5)
Asian-pacific Economic Literature     Hybrid Journal   (Followers: 5, SJR: 0.168, h-index: 15)
Assessment Update     Hybrid Journal   (Followers: 4)
Astronomische Nachrichten     Hybrid Journal   (Followers: 2, SJR: 0.701, h-index: 40)
Atmospheric Science Letters     Open Access   (Followers: 29, SJR: 1.332, h-index: 27)
Austral Ecology     Hybrid Journal   (Followers: 13, SJR: 1.095, h-index: 66)
Austral Entomology     Hybrid Journal   (Followers: 9, SJR: 0.524, h-index: 28)
Australasian J. of Dermatology     Hybrid Journal   (Followers: 8, SJR: 0.714, h-index: 40)
Australasian J. On Ageing     Hybrid Journal   (Followers: 7, SJR: 0.39, h-index: 22)
Australian & New Zealand J. of Statistics     Hybrid Journal   (Followers: 13, SJR: 0.275, h-index: 28)
Australian Accounting Review     Hybrid Journal   (Followers: 4, SJR: 0.709, h-index: 14)
Australian and New Zealand J. of Family Therapy (ANZJFT)     Hybrid Journal   (Followers: 3, SJR: 0.382, h-index: 12)
Australian and New Zealand J. of Obstetrics and Gynaecology     Hybrid Journal   (Followers: 44, SJR: 0.814, h-index: 49)
Australian and New Zealand J. of Public Health     Hybrid Journal   (Followers: 11, SJR: 0.82, h-index: 62)
Australian Dental J.     Hybrid Journal   (Followers: 7, SJR: 0.482, h-index: 46)
Australian Economic History Review     Hybrid Journal   (Followers: 4, SJR: 0.171, h-index: 12)
Australian Economic Papers     Hybrid Journal   (Followers: 27, SJR: 0.23, h-index: 9)
Australian Economic Review     Hybrid Journal   (Followers: 6, SJR: 0.357, h-index: 21)
Australian Endodontic J.     Hybrid Journal   (Followers: 3, SJR: 0.513, h-index: 24)
Australian J. of Agricultural and Resource Economics     Hybrid Journal   (Followers: 3, SJR: 0.765, h-index: 36)
Australian J. of Grape and Wine Research     Hybrid Journal   (Followers: 5, SJR: 0.879, h-index: 56)
Australian J. of Politics & History     Hybrid Journal   (Followers: 14, SJR: 0.203, h-index: 14)
Australian J. of Psychology     Hybrid Journal   (Followers: 18, SJR: 0.384, h-index: 30)
Australian J. of Public Administration     Hybrid Journal   (Followers: 401, SJR: 0.418, h-index: 29)
Australian J. of Rural Health     Hybrid Journal   (Followers: 4, SJR: 0.43, h-index: 34)
Australian Occupational Therapy J.     Hybrid Journal   (Followers: 69, SJR: 0.59, h-index: 29)
Australian Psychologist     Hybrid Journal   (Followers: 11, SJR: 0.331, h-index: 31)
Australian Veterinary J.     Hybrid Journal   (Followers: 19, SJR: 0.459, h-index: 45)
Autism Research     Hybrid Journal   (Followers: 31, SJR: 2.126, h-index: 39)
Autonomic & Autacoid Pharmacology     Hybrid Journal   (SJR: 0.371, h-index: 29)
Banks in Insurance Report     Hybrid Journal   (Followers: 1)
Basic & Clinical Pharmacology & Toxicology     Hybrid Journal   (Followers: 10, SJR: 0.539, h-index: 70)
Basic and Applied Pathology     Open Access   (Followers: 2, SJR: 0.113, h-index: 4)
Basin Research     Hybrid Journal   (Followers: 5, SJR: 1.54, h-index: 60)
Bauphysik     Hybrid Journal   (Followers: 2, SJR: 0.194, h-index: 5)
Bauregelliste A, Bauregelliste B Und Liste C     Hybrid Journal  
Bautechnik     Hybrid Journal   (Followers: 1, SJR: 0.321, h-index: 11)
Behavioral Interventions     Hybrid Journal   (Followers: 9, SJR: 0.297, h-index: 23)
Behavioral Sciences & the Law     Hybrid Journal   (Followers: 24, SJR: 0.736, h-index: 57)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 9, SJR: 0.11, h-index: 5)
Beton- und Stahlbetonbau     Hybrid Journal   (Followers: 2, SJR: 0.493, h-index: 14)
Biochemistry and Molecular Biology Education     Hybrid Journal   (Followers: 6, SJR: 0.311, h-index: 26)
Bioelectromagnetics     Hybrid Journal   (Followers: 1, SJR: 0.568, h-index: 64)
Bioengineering & Translational Medicine     Open Access  
BioEssays     Hybrid Journal   (Followers: 10, SJR: 3.104, h-index: 155)
Bioethics     Hybrid Journal   (Followers: 14, SJR: 0.686, h-index: 39)
Biofuels, Bioproducts and Biorefining     Hybrid Journal   (Followers: 1, SJR: 1.725, h-index: 56)
Biological J. of the Linnean Society     Hybrid Journal   (Followers: 16, SJR: 1.172, h-index: 90)
Biological Reviews     Hybrid Journal   (Followers: 3, SJR: 6.469, h-index: 114)
Biologie in Unserer Zeit (Biuz)     Hybrid Journal   (Followers: 42, SJR: 0.12, h-index: 1)
Biology of the Cell     Full-text available via subscription   (Followers: 9, SJR: 1.812, h-index: 69)
Biomedical Chromatography     Hybrid Journal   (Followers: 6, SJR: 0.572, h-index: 49)
Biometrical J.     Hybrid Journal   (Followers: 5, SJR: 0.784, h-index: 44)
Biometrics     Hybrid Journal   (Followers: 36, SJR: 1.906, h-index: 96)
Biopharmaceutics and Drug Disposition     Hybrid Journal   (Followers: 10, SJR: 0.715, h-index: 44)
Biopolymers     Hybrid Journal   (Followers: 18, SJR: 1.199, h-index: 104)
Biotechnology and Applied Biochemistry     Hybrid Journal   (Followers: 45, SJR: 0.415, h-index: 55)
Biotechnology and Bioengineering     Hybrid Journal   (Followers: 187, SJR: 1.633, h-index: 146)
Biotechnology J.     Hybrid Journal   (Followers: 14, SJR: 1.185, h-index: 51)
Biotechnology Progress     Hybrid Journal   (Followers: 39, SJR: 0.736, h-index: 101)
Biotropica     Hybrid Journal   (Followers: 19, SJR: 1.374, h-index: 71)
Bipolar Disorders     Hybrid Journal   (Followers: 9, SJR: 2.592, h-index: 100)
Birth     Hybrid Journal   (Followers: 37, SJR: 0.763, h-index: 64)
Birth Defects Research Part A : Clinical and Molecular Teratology     Hybrid Journal   (Followers: 2, SJR: 0.727, h-index: 77)
Birth Defects Research Part B: Developmental and Reproductive Toxicology     Hybrid Journal   (Followers: 5, SJR: 0.468, h-index: 47)
Birth Defects Research Part C : Embryo Today : Reviews     Hybrid Journal   (SJR: 1.513, h-index: 55)
BJOG : An Intl. J. of Obstetrics and Gynaecology     Partially Free   (Followers: 225, SJR: 2.083, h-index: 125)

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Journal Cover Acta Zoologica
  [SJR: 0.459]   [H-I: 29]   [6 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0001-7272 - ISSN (Online) 1463-6395
   Published by John Wiley and Sons Homepage  [1577 journals]
  • Phylogenetic Systematics: Haeckel to Hennig
    • Authors: Lennart Olsson; Georgy S. Levit, Uwe Hoßfeld
      PubDate: 2017-09-19T03:55:23.160403-05:
      DOI: 10.1111/azo.12221
       
  • A lotic-breeding salamander (Hynobius kimurae) modifies physiological and
           morphological traits during wintering
    • Authors: Masaichi Kakegawa; Masato Hasumi
      Abstract: Unlike other migratory salamanders, Hynobius kimurae moves to aquatic hibernacula during fall. Does submergence into water during fall induce changes in physiological and morphological traits' We investigated whether such changes occur in both sexes from the entrance into the water (November) to the exit from the water (May) in the laboratory. Mean duration of stay in the water was 21.7 weeks in males and 19.0 weeks in females. Spermiation began 13.8 weeks after the males entered the water. Sperm storage lasted for 6.3 weeks. Spawning occurred 18.3 weeks after the females entered the water. Cloacae swelled greatly soon after the sexes entered the water. In males after entering the water, tail shape changed from sticklike to finlike. Although physiological and morphological traits in other species change simultaneously in both the submergence into water and the onset of breeding activity only during spring, such changes occurred in individual H. kimurae firstly during fall (shortly after entering the water) and secondly during spring (shortly after awaking from hibernation). This difference suggests that these two-step changes during a prolonged period (fall–spring) are concentrated in a short period of aquatic-breeding activity during spring in other species with terrestrial hibernation and associated reproductive cycles.
      PubDate: 2017-09-15T03:45:31.934345-05:
      DOI: 10.1111/azo.12222
       
  • Hyaluronate likely contributes to the immunesuppression of the
           regenerating tail blastema in lizards: Implications for organ regeneration
           in amniotes
    • Authors: Lorenzo Alibardi
      Abstract: The regenerating tail blastema of lizards appears immunesuppressed, and the distribution of hyaluronate, a possible agent of immunesuppression, is evaluated. Transcriptome data show upregulation of genes stimulating hyaluronate production in the tail and limb blastemas. The distribution of hyaluronate in the tail and limb blastemas has been studied using alcian blue at pH 2.5 and 1.0 and by immunohistochemistry for hyaluronate receptors. Both tail and limb blastemas initially contain hyaluronate, but this glycosaminoglycan disappears in the scarring limb blastema at 25- to 30-day postamputation after intense inflammation. The regenerating tail tip moves distally during regeneration but conserves hyaluronate that is replaced by sulphated glycosaminoglycans and glycoproteins in proximal regions of the regenerating tail. Hyaluronate receptors are diffuse among blastema cells and ependyma of the tail, intense in wound epidermis but low to absent in the scarring limb. The electron microscope shows that an amorphous extracellular matrix likely containing hyaluronate surrounds mesenchymal cells, ependyma and wound epidermis in the tail but is scarce to absent in the limb, whereas collagen fibrils prevail. Extracellular matrix containing hyaluronate may shield blastema cells from circulating immune cells preventing deleterious immune reactions in the tail but not in the limb, a process leading to scarring.
      PubDate: 2017-09-07T23:32:16.144129-05:
      DOI: 10.1111/azo.12214
       
  • Functional morphology and neuronal innervation of the prothoracic defence
           gland in Timema
    • Authors: Konrad Stolz
      Abstract: Timema is the most basal genus of Phasmatodea and the sister group to the remaining stick and leaf-insects (Euphasmatodea). An autapomorphy of all phasmids is the paired prothoracic exocrine defence glands. In this study, the anatomy and innervation of the defence glands in Timema petita and Timema chumash are described and compared with the data on Euphasmatodea. In all phasmids, the glands consist of a cuticular epithelium, a secretory epithelium and muscular fibres that compress the lumen. In Timematodea, the muscular part of the gland is less developed than in Euphasmatodea and the ejection of the defence secretion depends on the dorsal longitudinal neck muscles. On the neuroanatomical level, Timema petita and Timema chumash lack neurons that are involved in the independent contraction of the gland in euphasmids. In both studied species of Timema, neck muscles play an active role in the gland function which is not observed in any other phasmid. Considering the basal position of this genus, this supports the hypothesis that in euphasmids, the muscular part of the gland evolved from the dorsal longitudinal neck muscles. Additionally, the same nerves that innervate the dorsal longitudinal neck muscles in all Polyneoptera also innervate the defence glands in phasmids.
      PubDate: 2017-09-04T00:56:04.695642-05:
      DOI: 10.1111/azo.12216
       
  • Description of the immature stages of two Mononychus species (Coleoptera:
           Curculionidae: Ceutorhynchinae) and a study of the host preferences of
           M. punctumalbum for Iris species in central Europe
    • Authors: Jiří Skuhrovec; Levent Gültekin, Magdalena Śmigala, Krystyna Winiarczyk, Agnieszka Dąbrowska, Rafał Gosik
      Abstract: Last larval instars and pupae of Mononychus punctumalbum (Herbst, 1784) and Mononychus schoenherri Kolenati, 1859 (Curculionidae, Ceutorhynchinae) are described in detail for the first time. No immatures of other species of this genus had previously been described. The immatures of Mononychus were compared with available data on immatures of all genera in the subfamily Ceutorhynchinae. Both the larvae and pupae of the two Mononychus species are very distinctive, having distinct characters from other genera in the subfamily Ceutorhynchinae. New bionomic data for M. punctumalbum concerning its host preferences for Iris species in central Europe can be used to verify literature data indicating the important role of the iris weevil in the dramatic decline in the plant's abundance in natural habitats as well as in gardens and other anthropogenic associations.
      PubDate: 2017-08-23T23:27:34.084327-05:
      DOI: 10.1111/azo.12213
       
  • Phenotypic differentiation analysis: A case study in hybridizing Çoruh
           trout (Salmo coruhensis), Rize trout (Salmo rizeensis) and brown trout
           (Salmo trutta fario)
    • Authors: Mehmet Kocabaş; Filiz Kutluyer, Nadir Başçinar
      Abstract: The aim of this study was to determine and compare the phenotypic variation in Çoruh trout (Salmo coruhensis), Rize trout (Salmo rizeensis), brown trout (Salmo trutta fario) and their native hybrids (S. rizeensis × S. t. fario; S. t. fario × S. coruhensis; S. rizeensis × S. coruhensis). The numbers and diameters of red and black spots were determined on operculum, fins and above and below the lateral line. The results from this study indicate that there were differences in spotting pattern, colour pattern or fin pigmentation traits between S. rizeensis, S. t. fario, S. coruhensis and their hybrids. Consequently, native S. rizeensis, S. t. fario and S. coruhensis were affected by interaction and phenotypic plastic aspects of traits in S. rizeensis were dominant in their hybrids (S. rizeensis × S. t. fario; S. rizeensis × S. coruhensis).
      PubDate: 2017-08-19T23:30:48.272242-05:
      DOI: 10.1111/azo.12211
       
  • Integument in Antarctic seals: A comparative study and its relation to
           extreme environments
    • Authors: Cecilia Mariana Krmpotic; Cleopatra Mara Loza, Javier Negrete, Alejo Carlos Scarano, Alfredo Armando Carlini, Alicia Guerrero, Claudio Gustavo Barbeito
      Abstract: Due to the semi-aquatic lifestyle of seals and the extreme climates they inhabit, their integumentary system has aroused the curiosity of several authors for more than a century. The aim of this contribution was to perform an exhaustive histological description of the integument Antarctic seals through different methodological approaches in a comparative framework. The species considered include the ice-obligate—Weddell (Leptonychotes weddellii) and leopard (Hydrurga leptonyx) seal—and the ice-tolerant, and southern elephant seal (Mirounga leonina). In addition, we attempted to link the histological features to their different lifestyles. All three species showed features related to their amphibious lifestyle (i.e., parakeratotic epidermis with abundant melanin granules, dermis with numerous arteriovenous anastomoses and a great amount of elastic fibres). In aquatic mammals, parakeratosis would decrease cellular replacement, the great amount of melanin is related to the high exposure to solar radiation, the presence of arteriovenous anastomoses is related to thermoregulatory mechanisms, and the presence of elastic fibres is due to variations of thickness in the adipose tissue that requires high elasticity of the dermis.
      PubDate: 2017-08-11T06:36:58.0578-05:00
      DOI: 10.1111/azo.12212
       
  • The moult cycle of the terrestrial isopod Armadillo officinalis Duméril,
           1816 (Crustacea: Isopoda: Oniscidea)
    • Authors: Giuseppe Montesanto; Sofia Cividini
      Abstract: The present work focuses on the moult cycle of Armadillo officinalis. For a 100-day period, 134 animals were observed and routinely examined with the aim of detecting distinctive morphological characters in the several stages and substages of the moult cycle and of disclosing their duration. Statistical tests and Poisson regression models with robust standard errors were used to investigate differences and relationships between moult and the size and gender of the animals. The appearance of the calcium carbonate deposits on the pereon sternites during the premoult stage was documented in detail, and three main substages were identified. The average duration of the premoult and of the biphasic ecdysis was about 12 and 1.5 days, respectively. This observation period, however, did not allow to establish a determined average duration of the intermoult stage, which was extremely variable. This stage lasted for 2 months or more in most of the cases observed, but about 1-month-long intermoult stages were also recorded. No statistically significant association was found between the number of moults and gender and size of the animals.
      PubDate: 2017-08-08T00:25:39.116134-05:
      DOI: 10.1111/azo.12210
       
  • Validation of a simple and well-suited chemical cleaning method for fish
           otoliths
    • Authors: Pierre S.P. Vandenbussche; Guillaume Spennato, Patrice Francour, Patricia M. Pierson
      Abstract: In marine biology, many research fields are based on use of fish otoliths. All the studies dealing with otoliths need as starting point a perfectly clean otolith. Dissection is difficult when working on small or highly jagged otoliths. A common problem is that during otolith preparation some fish tissue may remain stuck to it, even after a mechanical cleaning. Then, supplementary cleaning with chemicals is needed. Classical methods are known to possibly alter otolith's structure and/or composition. Here, we present a chemical cleaning method using only sodium hydroxide. We have validated the method on two different fish species, Oblada melanura and Dicentrarchus labrax. Observation and analyses of morphological measurements have confirmed significant suppression of residual tissues. We propose this method as a good alternative to previously published mono- or multichemical methods.
      PubDate: 2017-08-07T01:05:31.484626-05:
      DOI: 10.1111/azo.12209
       
  • Sense organs in Pycnogonida: A review
    • Authors: Tobias Lehmann; Martin Heß, Roland R. Melzer
      Abstract: The Pycnogonida or sea spiders are exclusively marine invertebrates, numbering about 1,300 described species worldwide. Given their remarkable position in phylogeny as basal chelicerates or even basal euarthropods, the structure of their sense organs can reveal important characters, which—in a comparative framework—provide arguments to phylogenetic discussions and help to develop scenarios of evolutionary transformations. This review summarizes current knowledge and presents new original data on the sense organs in pycnogonids, that is, the eyes, the lateral sense organs and the ciliary or sensillar sense organs. Except for the eyes, there are not many detailed studies available. The ultrastructure of the R-cells of the four eyes located on the ocular tubercle is described as “pseudoinverted”. The eyes are innervated to two visual neuropils located in the protocerebrum. The features of the lateral sense organ, also located on the ocular tubercle, are hitherto not conclusively resolved, a chemo- or thermoreceptive function is suggested. Finally, an overview of the various ciliary or sensillar sense organs distributed all over the body is given and the fine structure of branched setae is shown for the first time. The morphology of the sense organs of pycnogonids is compared with that of other arthropod taxa and assessed against the background of current theories of arthropod evolution.
      PubDate: 2017-07-21T23:42:58.783582-05:
      DOI: 10.1111/azo.12207
       
  • Diplectrum radiale (Quoy & Gaimard, 1824) (Serranidae): A rare case of
           simultaneous hermaphroditism in a teleost fish
    • Authors: Eudriano F. S. Costa; June F. Dias, Hilario Murua
      Abstract: This study generates, for the first time, information on the reproductive traits of the simultaneous hermaphrodite Diplectrum radiale. The specimens were captured bimonthly in two distinct ecosystems along the south-eastern Brazilian coast. The mature ovotestes were removed, preserved in formalin and examined using histological techniques. The results revealed indeterminate fecundity with asynchronous ovarian organization. All spermatogenesis occurs within cysts, and the spermatogonial distribution indicated an unrestricted testicular type. The testicular and ovarian tissues were separated from each other by different ducts, indicating no possibility of internal self-fertilization. The hydrated oocytes were stored in the accessory reproductive structure for at least 24 hr. The presence of atretic hydrated oocytes within this structure and the positive periodic acid–Schiff reaction of the villi-like projections revealed the function of the ovary sinus as absorbing unspawned oocytes. The relative batch fecundity ranged from 62 to 209 oocytes/g (126 ± 42) for specimens from the coast and from 52 to 203 oocytes/g (113 ± 57) for those sampled in the estuary. The potential batch fecundity was linearly related to size, weight, and the gonadosomatic and hepatosomatic indices, revealing that these parameters significantly affect the reproductive potential of D. radiale.
      PubDate: 2017-07-17T23:21:33.103569-05:
      DOI: 10.1111/azo.12206
       
  • Morphology and development of the male reproductive tract in Callinectes
           danae (Crustacea: Brachyura)
    • Authors: Renata A. Shinozaki-Mendes; Rosângela Lessa
      Abstract: The aim of this study was to characterize the morphology and function of each section of the reproductive system of male Callinectes danae, as well as the stages of reproductive development and their relation to secondary sexual characteristics. Development of their reproductive system begins after completion of the pubertal moult. The growth of the gonopodium showed negative allometry for both juveniles and adults. The reproductive system is divided into portions with different functions. There is a germinal zone in the testes containing spermatogonia, a zone of maturation containing spermatocytes, spermatids or spermatozoa, as well as a collecting duct, which carries spermatozoa to the vas deferens. There are two matrices in the anterior vas deferens that initiate the separation of spermatozoa groups, one composed of polysaccharide acids (matrix I) and another consisting of neutral polysaccharides (matrix II). In the median vas deferens, the matrix II forms an acellular capsule, which forms the spermatophores. In the posterior vas deferens, the matrices are accumulated, initially with a granular texture and are homogenous for the final portion. The ejaculatory duct and penis have muscle lining to expel the spermatophores at copulation. Even after copulation, males retain a stock of spermatophores, allowing copulation with other females.
      PubDate: 2017-07-09T23:06:13.991915-05:
      DOI: 10.1111/azo.12205
       
  • Genetic analysis of ciliates living on the groundwater amphipod Crangonyx
           islandicus (Amphipoda: Crangonyctidae)
    • Authors: Ragnhildur Gudmundsdóttir; Etienne Kornobis, Bjarni K. Kristjánsson, Snæbjörn Pálsson
      Abstract: Two endemic subterranean freshwater amphipod species have been discovered in groundwater of the volcanic active zone in Iceland, Crangonyx islandicus and Crymostygius thingvallensis. At least five different ciliate sequences were isolated from C. islandicus and the analysis of variation at the 18S ribosomal DNA gene suggests that they present previously unsequenced species, from the orders Apostomatida and Philasterida. Apostome ciliates are well known to be exuviotrophic epibionts on crustaceans. Analyses of ciliate epibionts from different groundwater amphipod species from North America and mainland Europe revealed distinct groups of ciliates and higher diversity on the epigean amphipod Crangonyx pseudogracilis. Analysis of geographic patterns of the most common ciliate within Iceland revealed population differentiation supporting limited current connectivity between the different groundwater systems. Our study reports an occurrence of previously undescribed ciliate species in a groundwater ecosystem characterized by low species diversity.
      PubDate: 2017-06-27T23:55:33.537439-05:
      DOI: 10.1111/azo.12204
       
  • Morphological and mitochondrial DNA variation revealed an undescribed
           lineage under the genus Sperata (Bagridae) in Bangladesh
    • Authors: Mohammed Mahbub Iqbal; M. M. Mahbub Alam, Muhammad Anamul Kabir, Snæbjörn Pálsson
      Abstract: Catfishes Sperata are popular, known for its taste and nutritional value, and are found naturally in wide variety of freshwaters in South Asia. The taxonomy of Sperata spp., sampled from Hakaluki Haor in Bangladesh, was re-evaluated based on morphological variation and DNA barcoding. The collective variation in morphometric characters and mitochondrial DNA revealed an undescribed old and well-separated lineage under the genus Sperata along with two previously known Sperata aor and Sperata seenghala in Bangladesh. Analyses of morphological traits suggested significant differentiation among Sperata species. The variation in mitochondrial DNA supported the distinct lineage and taxonomical discrimination. Sperata aor diverged earlier from the new lineage and Sperata seenghala with a divergence of 5.39 (CI: 3.91–7.19) Mya (PP > 90). Sperata seenghala and the new lineage shared a most recent common ancestry, which diverged from each other around 3.41 (CI: 2.24–4.62) Mya (PP > 90). Thus, the newly identified lineage could be a subspecies of S. seenghala or even a species under the genus Sperata. The information of the study will be useful for conservation, sustainable management and selective breeding of the putative species, including previously reported S. aor and S. seenghala in Bangladesh.
      PubDate: 2017-06-22T06:15:25.977555-05:
      DOI: 10.1111/azo.12203
       
  • Overlap Indices: Tools to quantify the amount of anatomical overlap among
           groups of incomplete terminal taxa in phylogenetic analyses
    • Authors: Emanuel Tschopp; Friedrich A. Tschopp, Octávio Mateus
      Abstract: Phylogenetic analyses of morphological data are often characterized by missing data due to incomplete operational taxonomic units, as in fossils. This incomplete knowledge derives from various reasons, including—in the case of fossils—the numerous filters an organism has to pass through during taphonomy, fossilization, weathering and collecting. Whereas several methods have been proposed to address issues raised by the inclusion of incomplete terminal taxa, until recently no tool existed to easily quantify the amount of anatomical overlap within a particular clade. The Overlap Indices provide such values and might prove useful for comparative cladistics. We herein describe these new indices and their applications in detail and provide an example file for their calculation. A case study of diplodocid sauropod dinosaurs shows how the Overlap Indices will help to explore and quantify, which one of a number of conflicting tree topologies is supported by more anatomical traits, which skeletal regions are underrepresented in a particular phylogenetic matrix, and which taxon would improve character state score completeness.
      PubDate: 2017-06-20T00:30:23.408614-05:
      DOI: 10.1111/azo.12202
       
  • Reproductive biology of Philodryas patagoniensis (Snakes: Dipsadidae) in
           south Brazil: Female reproductive cycle
    • Authors: Luiza Loebens; Claudio Augusto Rojas, Selma Maria Almeida-Santos, Sonia Zanini Cechin
      Abstract: In this study, we describe the female reproductive cycle of Philodryas patagoniensis in south Brazil, which was described through morpho-anatomical and histological analyses. The peak of secondary vitellogenesis occurred during winter–spring (July–December), ovulation in spring (October–December), mating and fertilization in spring–summer (October–February), oviposition in spring–autumn (October–May) and births from late spring to autumn (December–July). The diameter of vitellogenic follicles/eggs was larger in winter–spring than in other seasons. The diameter of the shell glands was also larger in winter–spring. In spite of the clear reproductive peak, gonads only showed reduced activity in the autumn. Therefore, at the individual level, females have a discontinuous cyclical reproduction; in the populational level, the reproductive cycle is seasonal semisynchronous. We support the hypothesis that P. patagoniensis have the ability to produce multiple clutches with long-term stored sperm. Sexual dimorphism in body size was evident, and females are significantly larger and heavier than males. Larger females were able to produce follicles and eggs in larger amount and size. The maternal body size was positively related to the reproductive effort and fecundity. To conclude, we deliberated about the proximal and distal causes that influence the reproductive traits and patterns of P. patagoniensis.
      PubDate: 2017-06-20T00:20:50.586172-05:
      DOI: 10.1111/azo.12200
       
  • Microridges in Cyprinus carpio scale epidermis
    • Authors: Joseph A. DePasquale
      Abstract: Actin-based microridges were evaluated in koi scale epidermis in situ. The fingerprint-patterned microridges covered the dorsal face of superficial layer cells and were overall similar to that described in many fishes. Several other microridge patterns were observed, however, ranging from loose or tightly packed ridges, fragmented ridges, a honeycomb ridge pattern and the presence of actin-rich puncta. Individual F-actin-stained microridges varied greatly in length, from a few to 30 μm or more, with a few single ridges extending the entire perimeter of a cell. Branched microridges, comprised of single ridges that appeared continuous with each other, extended to over 150 μm in some cases. The actin-binding proteins α-actinin and cortactin were distributed in a dot-like pattern along the length of individual ridges, consistent with bundled actin cores described in earlier studies. Antiphosphotyrosine antibody failed to detect this signal transduction-related amino acid modification in microridges unless tyrosine phosphatases were first inhibited, after which bright phosphotyrosine-rich dots were detected along the microridges.
      PubDate: 2017-06-18T23:57:02.89925-05:0
      DOI: 10.1111/azo.12201
       
  • Froghood: Postmetamorphic development of the rock river frog Thoropa
           miliaris (Spix, 1824) (Anura, Cycloramphidae)
    • Authors: Raoni Rebouças; Hélio Ricardo Silva, Delfi Sanuy
      Abstract: Thoropa miliaris is a frog species endemic to the Brazilian Atlantic Rainforest, inhabiting wet rocky habitats. Males of this species present nuptial excrescences, which are keratinized spines on the surface of some fingers and internal metacarpal tubercles. Although these spines are usually associated with male adulthood, no details of their development are available. To investigate the sequence of spines' appearance, we correlated the number of spines with size and age, which was estimated by skeletochronology. We studied individuals collected from Rio de Janeiro, Brazil. There was significant correlation between size of individuals and number of spines and between age and number of spines in the callosities. The first spines appeared in metacarpal–phalangeal articulation of finger II, when specimens were 1 year old. The estimated growth curve did not show stabilization at any age. We considered the degree of development of the nuptial excrescences as a proxy for sexual maturity and so individuals may already be sexually active by 1 year of age. Estimated longevity of T. miliaris is similar to that estimated for other tropical species of frogs. Although growth in anuran species is considered to be undetermined, in T. miliaris, it seems to fit either undetermined or determined models.
      PubDate: 2017-05-31T00:50:28.255085-05:
      DOI: 10.1111/azo.12199
       
  • Msx1-2 immunolocalization in the regenerating tail of a lizard but not in
           
    • Authors: Lorenzo Alibardi
      Abstract: The immunolocalization of the muscle segmental homoeobox protein Msx1-2 of 27–34 kDa in the regenerating tail blastema of a lizard shows prevalent localization in the apical ependyma of the regenerating spinal cord and less intense labelling in the wound epidermis, in the apical epidermal peg (AEP), and in the regenerating segmental muscles. The AEP is a micro-region of the regenerating epidermis located at the tail tip of the blastema, likely corresponding to the AEC of the amphibian blastema. No immunolabelling is present in the wound epidermis and scarring blastema of the limb at 18–21 days of regeneration, except for sparse repairing muscles. The presence of a proximal–distal gradient of Msx1-2 protein, generated from the apical ependyma, is suggested by the intensity of immunolabelling. The AEP and the ependyma are believed to induce and maintain tail regeneration, and this study suggests that Msx1-2 proteins are components of the signalling system that maintains active growth of the tail blastema. The lack of activation and production of Msx1-2 protein in the limb are likely due to the intense inflammatory reaction following amputation. This study confirms that, like during regeneration in fishes and amphibians, also the blastema of lizards utilizes common signalling pathways for maintaining regeneration.
      PubDate: 2017-05-20T02:25:40.440117-05:
      DOI: 10.1111/azo.12198
       
  • Morphology and ontogenetic changes in otoliths of the mesopelagic fishes
           Ceratoscopelus maderensis (Myctophidae), Vinciguerria attenuata and
           V. poweriae (Phosichthyidae) from the Strait of Messina (Mediterranean
           Sea)
    • Authors: Laith A. Jawad; Giuseppe Sabatino, Ana L. Ibáñez, Franco Andaloro, Pietro Battaglia
      Abstract: Fish otoliths morphology is an important aid in taxonomic, phylogenetic, palaeoichthyological and dietary studies. This study compares the morphology of the otoliths of the myctophid species, Ceratoscopelus maderensis, and two phosichthyid species, Vinciguerria attenuata and V. poweriae, collected from the Strait of Messina in the central Mediterranean Sea to identify the most appropriate taxonomical characters that separate these species. Ontogenetic changes in the otoliths of the studied fishes are evident. The sagitta of the juvenile C. maderensis is the most similar to the adult otoliths, while otoliths of the juvenile V. poweriae are the least similar to the adult otoliths. A discussion on possible geographical variations in otolith's morphology is provided by comparing our results with sagitta's images of C. maderensis, V. attenuata and V. poweriae in other studies.
      PubDate: 2017-05-20T02:25:33.269687-05:
      DOI: 10.1111/azo.12197
       
  • The specialisation of the third metacarpal and hand in arboreal frogs:
           Adaptation for arboreal habitat'
    • Authors: Ning-Xin Dang; Ji-Shan Wang, Jin Liang, De-Chun Jiang, Jun Liu, Li Wang, Jia-Tang Li
      Abstract: Skeletal morphology is directly associated with habitat characteristics. To investigate the arboreal adaptation, we studied the osteological morphology of the forelimbs and the third metacarpals of arboreal frogs (Rhacophoridae and Hylidae) and non-arboreal frogs (Bombinatoridae, Bufonidae, Megophryidae, Ranidae, and Microhylidae) using transparent specimens or X-rays of skeletons. Our results revealed that the bony knob on the third metacarpal, which formed by a dilated and elongated lateral articular cartilage (AL) through endochondral ossification, occurred only in species of Rhacophorinae. The results of the phylogenetic comparative methods and correlation analysis strongly supported the conclusion that the bony knob is a phylogenetic independent evolution trait and had a significant correlation with the arboreal habitat. Furthermore, anatomical observation showed that a muscle adhered to the bony knob. Therefore, we speculated that the bony knob might act as an enlarged attachment point for larger or more musculatures to help with grasping. In addition, the relative length of the hand showed a significant difference between arboreal and non-arboreal species (p = .007), suggesting that longer hands might be an arboreal adaptive trait. Overall, this study leads to a deeper understanding of the arboreal adaptation.
      PubDate: 2017-05-16T03:40:30.939121-05:
      DOI: 10.1111/azo.12196
       
  • Gametogenesis and reproductive dynamics of Rhinella schneideri (Anura:
           Bufonidae): Influence of environmental and anthropogenic factors
    • Authors: Michel Montezol; Mônica Cassel, Débora Silva, Adelina Ferreira, Mahmoud Mehanna
      Abstract: This is the characterisation of the reproductive dynamics of Rhinella schneideri in an urban area during two non-consecutive periods. Germ cells are similar to those of other anuran species, but some characteristics were more marked for R. schneideri, such as the morphological similarity of spermatogonia and oogonia, which may be related to their potential for development into both stem cell types. The presence of lampbrush chromosomes, the extensive variation in number and organisation of the nucleoli and the organisation of the nuclear cortex are also characteristic of this species. All of these features appear to work together, participating in the dynamic growth of the oocyte. In some specimens, previtellogenic oocytes were also observed in the seminiferous tubules, which may be related to anthropogenic changes induced in the study area. In the first study period, reproductive dynamics revealed synchrony between the sexes, with the preparation of the gonads from October to December and the reproductive season from October to January, coinciding with the rainy season. In the second period, reproductive synchrony was also observed, but gonad preparation occurred from February to June and the reproductive season was from August to November, before the rainy season. These changes in the reproductive cycle suggest that urbanisation affects the reproduction of this species.
      PubDate: 2017-05-05T05:12:26.575369-05:
      DOI: 10.1111/azo.12195
       
  • Morphology of the retina in deep-water fish Nezumia sclerorhynchus
           (Valenciennes, 1838) (Gadiformes: Macrouridae)
    • Authors: Magdalena García; Sabina Tomás, Maria Laura Robles, Alfonso Ramos, Yolanda Segovia
      Abstract: Using light microscopy, we examined the retina of benthopelagic fish Nezumia sclerorhynchus. Although the retina is typical of other vertebrates, having three nuclear and two synaptic layers, it presents some features associated with the animal's deep-sea habitat. A stratum argenteum containing iridescent crystals is located in the choroid. The pigment cell layer shows bulky cells filled with melanin granules but without the typical apical processes. The visual cells, consisting of a big population of rods, are arranged in several banks. No cones were observed. The outer segments are very long and cylindrical, and the inner segments are constituted by a small ellipsoid at the proximal end. The outer nuclear layer contains several rows of oval nuclei, and the spherules in the outer plexiform layer have less regular outlines than nuclei. The inner retina is characterized by very large horizontal cells, and presumable bipolar and amacrine cells separated by large spaces that are occupied by neuronal processes. Finally, the low density of ganglion cells produces a thin nerve fibre layer. The results of this study suggest that the retina of Nezumia sclerorhyncus exhibits high visual sensitivity and that vision is a sense that plays an important role in its behaviour.
      PubDate: 2017-05-05T04:43:51.966496-05:
      DOI: 10.1111/azo.12194
       
  • Lateral line scale types and review of their taxonomic distribution
    • Authors: Elena P. Voronina; Dianne R. Hughes
      Abstract: The trunk canal of fishes is contained within a series of lateral line (LL) scales. To categorise LL scale structural types, and determine their distribution, an analysis of original data was undertaken using light and scanning electron microscopy in combination with a literature survey from over 1,000 species representative of most orders of bony fishes. Our categorisation of LL scales is based on the relationship between the tube, or ossified trunk canal segment, and associated scale. Tubular-Scalar LL scales consist of a distinguishable tube and elasmoid scale in scale pockets. Four types occur only in species with elasmoid scales. Integrated LL scales do not develop in scale pockets, and their tube is enclosed or extended by a non-elasmoid scale or spines. Integrated 1 and 2 LL scales co-occur with ganoid and calcidermoid scales, and Integrated 3 LL scales occur when common scales are absent or elasmoid. Tubular LL scales are tubes only, occurring mainly in scaleless species or with calcidermoid and elasmoid scales. Non-Tubular LL scales are composed only of a scale, co-occurring mainly with cycloid scales. There is consistency of LL scale type in many orders, families and genera and the presence of different types within taxa can be meaningful.
      PubDate: 2017-04-22T03:01:04.865976-05:
      DOI: 10.1111/azo.12193
       
  • Two potential players in the evolutionary theatre: Do caddisflies mimic
           gastropods?
    • Authors: Benedikt Wiggering; Matthias Glaubrecht
      Abstract: Mimicry is one of the best examples of coevolution. For a mimetic system to function, the mimic has to equal its model. Due to this close dependence, mimetic systems promise deep insights into modes and means of evolution. Mimicry is known to occur in many taxa across different groups of organisms. However, while a plethora of mimetic systems exist, cross-phyla convergences have only rarely been reported in shelled gastropods. Our literature survey brought to light several mimetic systems including gastropods (as model or mimic), all of them in either a marine or a terrestrial setting. We here report on the first potential case of mimicry involving freshwater snails. We found larval cases of European Helicopsyche caddisfly to closely resemble Valvata gastropod shells in shape and size. In particular, stunning is the detailed similarity of features in these trichopteran cases to those characteristic for snail shells, for example, apex, aperture and umbilicus, hinting at a strong selection pressure to be involved. We discuss this unique case of mimicry that might hold unparalleled insight in mimetic relationships, taking into account alternative environmental factors and potential predatory dupes, in particular birds that might have successively caused the evolution of coiled cases in helicopsychid trichopterans.
      PubDate: 2017-03-31T07:05:44.587733-05:
      DOI: 10.1111/azo.12192
       
  • Morphology of the copulatory organ in Ortalis canicollis (Aves: Cracidae)
           and early evolution of the phallus in birds
    • Authors: Diego Matiussi Previatto; Gustavo Leite Gonçalves, Marcela Carvalho Ortiz, Carla Danielle Melo-Soares, Sérgio Roberto Posso
      Abstract: We studied the morphology of the copulatory organ of Ortalis canicollis and its evolution in birds. The phallus of O. canicollis is intromittent, with a blind tubular cavity and two distinct regions when erect: the base of the phallus, which shows the mucosa smooth and lined by a pseudostratified columnar epithelium, and the tubular portion, which shows the mucosa lined by a keratinized stratified squamous epithelium with little knobs. The phallus includes two vascular bodies at the cranial portion in the urodeum. A fibrocartilaginous body anchors the tubular portion therefrom up to the eversible portion. A branched elastic ligament inserts on different regions of the tubular portion. The phallus is plesiomorphic in birds and it has disappeared in Megapodius, Leipoa and Neoaves. The asymmetric phallus evolved early and it was retained in the basal branches of birds. The intromittent phallus is plesiomorphic in birds (found in Archosauria's ancestor), but Crypturellus, Numididae, Odontophoridae and Phasianidae have developed a non-intromittent phallus a posteriori. The blind tubular cavity and the fibrocartilaginous body evolved as an adaptive convergence many times in birds. Therefore, this study shed some light on morphological aspects of the phallus and contributed to understand its evolution in birds.
      PubDate: 2017-03-31T06:50:39.655327-05:
      DOI: 10.1111/azo.12191
       
  • Age at sexual maturity of male and female banana weevils, Cosmopolites
           sordidus Germar (Coleoptera: Curculionidae)
    • Authors: Richard P. Uzakah
      Abstract: This study was to determine the age at sexual maturity and the relationships between age and internal reproductive organs of Cosmopolites sordidus. Male banana weevils become sexually mature 18 days after emergence (DAE), that is after 2 weeks of adult eclosion, in spite of the fact that spermatogenesis is completed at emergence. A positive correlation exists between age and male internal organs, for example for mean testis diameter (r = .849, p ≤ .001), mean seminal vesicle diameter (r = .679, p ≤ .001), mean accessory gland length (r = .561, p ≤ .01) and mean accessory gland diameter (r = .498, p ≤ .05), respectively. Significant differences were recorded between sexually mature and immature weevils with respect to mean testis diameter (T = 4.471, p ≤ .001) and mean seminal vesicle diameter (T = 3.939, p ≤ .001), but not with mean accessory gland length and mean accessory gland diameter (T = 1.899 and 1.661). Male internal organs were visibly underdeveloped at emergence but became significantly enlarged and developed on attainment of sexual maturity. Female C. sordidus, on the other hand, are sexually mature at 5 DAE. There was also a strong, positive correlation between age of females and mean ovariole length (r = .656, p ≤ .001), and significant differences existed between mean ovariole lengths of sexually mature and immature females (T = 4.306, p ≤ .001). Increasing age of females witnessed progressive increases in ovariole lengths and developmental changes within female ovarioles and calyces. The findings made here may be helpful in Musa germplasm screening works, as weevils bred on susceptible cultivars may reveal similar results, while those bred on resistant ones may experience possible delays in their reproductive developments.
      PubDate: 2017-03-30T01:35:29.270021-05:
      DOI: 10.1111/azo.12190
       
  • Functional morphology of the male reproductive system in Callichirus major
           (Crustacea: Decapoda: Axiidea): Evidence of oocytes in the gonad
    • Authors: Tugstênio L. Souza; Adriane A. Braga, Laura S. López-Greco, Erika T. Nunes
      Abstract: Callichirus major inhabits the intertidal region of marine ecosystems and it is frequently used as live bait for fishing. This study aimed to describe the functional anatomy of the male reproductive system by microscopic techniques. The animals were collected along the Corujão beach, Piuma—ES, Brazil, and, in laboratory, the males were classified into two phases: immature (IM) and developed (DE) based on the macroscopic characteristics of the gonads. The gonad and vas deferens were dissected for histological routine and histochemical tests. Histologically, it was noted that in both phases, the more distal region of gonads has ovarian characteristics, showing developing oocytes. Also, different male germ cells were identified: spermatogonium (SPG), spermatocytes I and II (SPTCI, SPTCII), initial and final spermatid (IS, FS) and sperm (SPZ). Accessory cells with spherical or pyramidal nuclei were also present inside the testicular lobules. According to the vas deferens structure, three regions can be characterized: proximal (PVD), middle (MVD) and distal (DVD). In the lumen of the vas deferens, a spermatophoric matrix highly reactive for histochemical tests was observed. The presence of female germ cells in males suggests the occurrence of intersexuality or hermaphroditism in this species.
      PubDate: 2017-03-20T04:06:06.298562-05:
      DOI: 10.1111/azo.12189
       
  • Histology of mental and caudal courtship glands in three genera of
           plethodontid salamanders (Amphibia: Plethodontidae)
    • Authors: Ariana E. Rupp; David M. Sever
      Abstract: Salamanders in the family Plethodontidae exhibit a unique tail-straddle walk during courtship that can include the use of sexually dimorphic mental and caudal courtship glands. This study presents novel histological and fine structure data on mental glands and caudal courtship glands in Plethodon mississippi, Desmognathus conanti and Eurycea quadridigitata using both light microscopy and scanning electron microscopy. This study represents the first use of scanning electron microscopy to observe these glands. Both mental and caudal courtship glands were observed to vary seasonally in gland diameter and histology according to the breeding season of each species. Morphological variation was observed across the three species studied in both clustering and relative size of the glands compared to neighbouring mucous and granular glands. Hypertrophied mental glands are larger than mucous or granular glands in all species, but relationships among caudal courtship glands and other skin glands vary among species. In E. quadridigitata, active caudal courtship glands are larger than mucous and granular glands, but in D. conanti, caudal courtship glands are similar in size to granular glands and larger than mucous glands. In P. mississippi, caudal courtship glands are scattered among significantly larger granular glands and are similar in size to mucous glands.
      PubDate: 2017-03-13T02:11:09.197569-05:
      DOI: 10.1111/azo.12188
       
  • Ontogenetic changes in spot configuration (numbers, circularity, size and
           asymmetry) and lateral line in Neurergus microspilotus (Caudata:
           Salamandridae)
    • Authors: Somaye Vaissi; Paria Parto, Mozafar Sharifi
      Abstract: Coloration in three of four species of the genus Neurergus including N. microspilotus is characterized by the presence of yellow spots on a dark skin, but there is no available information about changes in spot configuration, speed of development and degree of association between melanophore-free region and the lateral line. In this study, spot numbers, spot circularity, spot size and spot asymmetry were studied during larval to adult growth in N. microspilotus during July 2012 to June 2015. The mean numbers of spots increased during the late larval stage till postmetamorphic period from 13.33 ± 3.77 to 22.53 ± 4.09 and reached 42.62 ± 4.06 in adults. At the same time, the extent of spots gradually decreased in size from 5.80 ± 1.00 to 3.57 ± 0.97 mm2 and reached 3.55 ± 1.42 mm2 in adults, but the spot circularity increased from 0.48 ± 0.23 to 0.78 ± 0.49 and reached 0.80 ± 0.15 in adults. In adults, the numbers, circularity, size and asymmetry of spots remain stable with little but non-significant changes during the study period. Histological study shows that formation of a melanophore-free region correlates with the development of the lateral line receptors. This study demonstrates that the effects of lateral line on chromatophores persist through middle larval stages but diminish as metamorphosis completes.
      PubDate: 2017-02-14T02:15:37.36591-05:0
      DOI: 10.1111/azo.12187
       
  • Comparative morphology of sensilla on antenna, maxillary palp and labial
           palp of larvae of Eucryptorrhynchus scrobiculatus (Olivier) and
           E. brandti (Harold) (Coleoptera: Curculionidae)
    • Authors: Yuchao Yang; Lili Ren, Tao Wang, Lili Xu, Shixiang Zong
      Abstract: Eucryptorrhynchus scrobiculatus (Olivier) and E. brandti (Harold) are two wood boring pests of Ailanthus altissima (Mill.) Swingle (tree of heaven) and the variety Ailanthus altissima var. Qiantouchun. These beetles attack healthy trees and bore into roots and trunks during the larval stage. We studied the typology, distribution and morphostructure of the sensilla on the antennae, maxillary palps and labial palps of E. scrobiculatus and E. brandti larvae using scanning and transmission electron microscopy. The results showed the following: (i) the antennae of the two weevil larvae had two types of sensilla, sensilla basiconica (S.b.1 and S.b.2) and sensilla twig basiconica (S.tb.1-S.tb.3), with S.tb.4 observed only on the antennae of E. brandti larvae; (ii) the maxillary palps had three types of sensilla, S.b.2, S.tb. (S.tb.2, S.tb.3 and S.tb.5) and digitiform sensilla; (iii) the labial palps had two types of sensilla, S.b.2 and S.tb. (S.tb.2, S.tb.3 and S.tb.5); (iv) the quantity and distribution of sensilla on the antennae, maxillary palps and labial palps remained constant between E. scrobiculatus and E. brandti larvae; and (v) sensilla basiconica had distinct sidewall pores, an apical pore was observed on sensilla twig basiconica, and digitiform sensilla were oval in shape, with a distinct apical pore. Based on the microstructure of the cuticle wall and dendrite, we hypothesized that these sensilla functioned as olfactory, gustatory and hygro-/thermo-receptors, respectively. We discuss the relationships among types of sensilla and the types of damage caused by the larvae inside the host tree to understand olfactory and gustatory receptor mechanisms. The results of this study will provide a firm basis for future electrophysiological studies.
      PubDate: 2017-02-14T02:10:34.676263-05:
      DOI: 10.1111/azo.12185
       
  • Eosinophilic granule cells in Carassius auratus scale epidermis
    • Authors: Joseph A. DePasquale
      Abstract: Eosinophilic granule cells (EGCs) were characterized in Carassius auratus scale epidermis in situ and in explants. Live EGCs were readily identified by the presence of numerous large cytoplasmic granules observed with DIC microscopy. Histochemical staining with toluidine blue and alcian blue yielded granule metachromasia and pale blue granules, respectively, both consistent with mammalian mast cell staining. However, EGCs also share some features with mammalian basophils as neutral red dye was selectively incorporated into EGC granules. EGCs within scale epidermis were actively motile, displaying average speeds of 16 μm/min and maximum speeds of greater than 40 μm/min and showing morphological plasticity during migration. The predominant motile phenotype was elongate with a well-developed leading lamella, while a broader body motile morphology was observed to a lesser extent. A trailing, relatively unchanged uropod was associated with every motile EGC and invariably contained one or a few granules. A rounded EGC shape without a leading-edge or trailing uropod was also observed and was generally associated with static cells. Individual cells readily switched between the three major shapes during motility; static cells could abruptly develop a polarized morphology, and actively motile cells switched between elongate and broad-bodied shapes or the static, rounded shape.
      PubDate: 2017-02-07T02:10:59.086944-05:
      DOI: 10.1111/azo.12184
       
  • Buchnera aphidicola of the birch blister aphid, Hamamelistes betulinus
           (Horváth, 1896) (Insecta, Hemiptera, Aphididae: Hormaphidinae): molecular
           characterization, transmission between generations and its geographic
           significance
    • Authors: Piotr Wegierek; Anna Michalik, Karina Wieczorek, Mariusz Kanturski, Michał Kobiałka, Karolina Śliwa, Teresa Szklarzewicz
      Abstract: The birch blister aphid Hamamelistes betulinus, like most aphids, is host to obligate symbiotic bacterium Buchnera aphidicola. Ultrastructural and molecular analyses did not reveal the presence of secondary symbionts in the body of H. betulinus. The bacteria Buchnera aphidicola are transmitted to the next generation vertically (maternally). The bacteria released from the cytoplasm of the bacteriocyte to the haemolymph migrate to the embryo at the cellular blastoderm stage, through the opening at its posterior pole. Next, the bacteria enter the cytoplasm of newly formed bacteriocytes. The concept of the relationship between the geographic distribution of Hormaphidini aphids and the presence/absence of bacterium Buchnera aphidicola is discussed.
      PubDate: 2017-01-27T10:15:55.698918-05:
      DOI: 10.1111/azo.12186
       
  • Intraspecific variation in body size and sexual size dimorphism, and a
           test of Rensch's rule in bats
    • Authors: Carina M. V. Ulian; Marcelo N. Rossi
      Abstract: The magnitude and direction of sexual size dimorphism (SSD) may vary considerably within and among taxa, and the primary causes of such variation have not been thoroughly elucidated. For example, the effect of abiotic factors is frequently attributed to explain intra- and interspecific variation in SSD. Rensch's rule, which states that males vary more in size than females when body size increases, has rarely been tested in bats. Therefore, whether bats follow Rensch's rule remains unclear, particularly when females are larger than males. We investigated whether four bat species presented SSD, as well as whether their body sizes varied within each sex across localities, testing the hypothesis that intraspecific SSD varies substantially depending of sampling localities. We finally examined whether bats followed Rensch's rule by simultaneously using intraspecific and interspecific approaches. Although SSD was not observed for most bat species within each locality, the females of three of the four captured species exhibited differences in body size between particular localities. Usually the females varied more in size than did males across localities, mostly exhibiting a female-biased SSD. Significant differences in SSD were observed (i.e. mean values of the sexual dimorphism index), even though Rensch's rule was not followed.
      PubDate: 2017-01-02T08:35:23.736461-05:
      DOI: 10.1111/azo.12183
       
 
 
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