Results 201 to 210 of about 6,079 (252)
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A Digest of Elasmobranch Tapeworms
Journal of Parasitology, 2014This review brings together decades of work on elasmobranch tapeworms. The field has advanced significantly over the past 20 yr, with an emphasis on the discovery and description of novel taxa, and the establishment of phylogenetic frameworks for individual orders and their interrelationships. Tapeworms parasitizing elasmobranchs represent 9 orders and
Janine N, Caira, Kirsten, Jensen
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The microvasculature of the elasmobranch gill
Cell And Tissue Research, 1980Corrosion replicas were made of the gill vasculature of the spiny dogfish shark (S. acanthias) and little skate (R. erinacea) by methylmethacrylate perfusion via the ventral or dorsal aorta at 2.0-5.3 kPa. After tissue maceration the replicas were examined by light and scanning electron microscopy.
K R, Olson, B, Kent
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Comparative Biochemistry and Physiology Part A: Physiology, 1972
Abstract 1. 1. Foreign compounds generally exert effects on elasmobranchs that are qualitatively similar to those they exert in mammals. 2. 2. Certain drugs acting on higher centers of the central nervous system produce little effect in the dogfish. 3. 3.
R H, Adamson, A M, Guarino
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Abstract 1. 1. Foreign compounds generally exert effects on elasmobranchs that are qualitatively similar to those they exert in mammals. 2. 2. Certain drugs acting on higher centers of the central nervous system produce little effect in the dogfish. 3. 3.
R H, Adamson, A M, Guarino
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Relative Eye Size in Elasmobranchs
Brain, Behavior and Evolution, 2007Variation in relative eye size was investigated in a sample of 46 species of elasmobranch, 32 species of sharks and 14 species of batoids (skates and rays). To get a measure of eye size relative to body size, eye axial diameter was scaled with body mass using least-squares linear regression, using both raw species data, where species are treated as ...
Lisney, Thomas J., Collin, Shaun P.
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The elasmobranch pupillary response
Vision Research, 1971Abstract The rate and extent of the pupillary response to light and darkness were determined for a variety of sharks and rays. Dilation required 1–60 min and constriction 1–30 min, depending on the species. All responses were non-consensual. The dilator muscle was controlled by the third cranial nerve, which probably exerts a constant dilatory tonus ...
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Body fluid volume regulation in elasmobranch fish
Comparative Biochemistry and Physiology Part A, Molecular & Integrative Physiology, 2007 This review addresses an often overlooked aspect of elasmobranch osmoregulation, i.e., control of body fluid volume. More specifically the review addresses the impact of changes in blood volume in elasmobranchs exposed to different environmental ...
W Gary Anderson +2 more
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The Acoustical Biology of Elasmobranchs
Environmental Biology of Fishes, 2001A report on the auditory capabilities and their associated functions of elasmobranch fishes along with a brief review of the physics of underwater sound as it relates to hearing by fishes is provided. The inner ears of elasmobranchs possess structures that are no different from other fishes, except for an enlarged macula neglecta, which is unique among
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Journal of the Marine Biological Association of the United Kingdom, 1969
The density of 18 species, measured by weighing them in sea water and in air, was found to vary widely. The weights of these fish in sea water ranged from about 7 % to less than 1 % of their air weights.
Q. Bone, B. L. Roberts
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The density of 18 species, measured by weighing them in sea water and in air, was found to vary widely. The weights of these fish in sea water ranged from about 7 % to less than 1 % of their air weights.
Q. Bone, B. L. Roberts
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Morphological abnormalities in elasmobranchs
Journal of Fish Biology, 2015A total of 10 abnormal free‐swimming (i.e. post‐birth) elasmobranchs are reported from The (Persian–Arabian) Gulf, encompassing five species and including deformed heads, snouts, caudal fins and claspers. The complete absence of pelvic fins in a milk shark Rhizoprionodon acutus may be the first record in any elasmobranch. Possible causes, including the
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The fossil record of extant elasmobranchs
Journal of Fish Biology, 2020AbstractSharks and their relatives (Elasmobranchii) are highly threatened with extinction due to various anthropogenic pressures. The abundant fossil record of fossil taxa has allowed the tracing of the evolutionary history of modern elasmobranchs to at least 250 MYA; nonetheless, exactly how far back the fossil record of living taxa goes has never ...
Paillard, Adele +2 more
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