Results 181 to 190 of about 6,684 (211)
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Ventricular fluid production rates and turnover in elasmobranchii
Comparative Biochemistry and Physiology, 1964Abstract 1. 1. Ventricular fluid (VF) production rates were measured by frontocerebellar perfusion with buffered inulin solution in three species of sharks; the spiny dogfish ( Squalus acanthia ). the nurse shark ( Ginglymostoma cirratum ) and the lemon shark ( Negaprion brevirostris ). 2. 2.
W W, OPPELT +3 more
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The selective drivers of allometry in sharks (Chondrichthyes: Elasmobranchii)
Zoological Journal of the Linnean Society, 2023AbstractIn addition to the selective importance of interspecific morphological variation, ontogenetic morphological variation may reflect different selective regimes to which successive developmental stages are subjected. The typical body form of carcharhiniform sharks is considered relatively conserved, yet sharks exhibit a wide range of body sizes ...
Joel H Gayford +3 more
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Management of Sharks and Their Relatives (Elasmobranchii)
Fisheries, 2000(2000). Management of Sharks and Their Relatives (Elasmobranchii) Fisheries: Vol. 25, No. 3, pp. 9-13.
J. A. Musick +4 more
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Dentition of the apron ray
The present study provides quantitative and qualitative analyses of the dentition of Discopyge tschudii. Overall, 193 individuals (99 males and 94 females) of D. tschudii were collected on scientific trawl surveys conducted by the National Institute for Fisheries Research and Development (INIDEP) and commercial vessels in Argentina.
Spath, María Cecilia +2 more
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Dental homologies in lamniform sharks (Chondrichthyes: Elasmobranchii)
Journal of Morphology, 2001AbstractThe dentitions of lamniform sharks are said to exhibit a unique heterodonty called the “lamnoid tooth pattern.” The presence of an inflated hollow “dental bulla” on each jaw cartilage allows the recognition of homologous teeth across most modern macrophagous lamniforms based on topographic correspondence through the “similarity test.” In most ...
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Occipital spine ofOrthacanthus (Xenacanthidae, Elasmobranchii): Structure and growth
Journal of Morphology, 1999The morphology of 16 occipital spines of the xenacanthid Orthacanthus from Upper Carboniferous deposits of Robinson (Kansas, USA), Nýran (Czech Republic) and Puertollano (Spain) is described. The nonreplaced spines reveal the growth pattern of the shark.
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The cardiac ultrastructure of Chimaera monstrosa L. (Elasmobranchii: Holocephali)
Cell and Tissue Research, 1979The ultrastructure of the heart in Chimaera monstrosa L. is described. The endocardial and the epicardial cells are similar in the three cardiac regions. Myocardial cells show small variations. The myofibred, 4--6 microns thick, contains one or a few myofibrils. Each myosin filament is surrounded by six actin filaments.
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Morphological Indicators of Olfactory Capability in Wobbegong Sharks (Orectolobidae, Elasmobranchii)
Brain, Behavior and Evolution, 2009Elasmobranchs are thought to possess an acute sense of smell, but the relationship between the anatomy of their olfactory organs and their sensory ecology is poorly understood. Moreover, the ecological diversity of elasmobranchs as a group indicates that there might be considerable interspecific variation in the importance of the olfactory sense ...
Theiss, S. M. +2 more
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Feeding habits of the speckled guitarfish Rhinobatos glaucostigma (Elasmobranchii: Rhinobatidae)
Journal of Fish Biology, 2015The stomachs of 464 speckled guitarfish Rhinobatos glaucostigma were sampled from the south‐eastern Gulf of California (GC) to determine diet composition. Numerical indices and prey‐specific index of relative importance (%IPSIR) were used to determine the feeding strategy of the species.
R E, Lara-Mendoza +2 more
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Paleontological Journal, 2021
The similarity at the genus-level was estimated between 23 Cenomanian elasmobranch assemblages from different regions of the world (Volga Region, Mangyshlak, Anglo-Paris basin, Lithuania, northwestern Germany, southwestern France, northern Spain, North America, Venezuela, Lebanon, Egypt, Algeria, Nigeria, Angola, India, Australia) using the Jaccard ...
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The similarity at the genus-level was estimated between 23 Cenomanian elasmobranch assemblages from different regions of the world (Volga Region, Mangyshlak, Anglo-Paris basin, Lithuania, northwestern Germany, southwestern France, northern Spain, North America, Venezuela, Lebanon, Egypt, Algeria, Nigeria, Angola, India, Australia) using the Jaccard ...
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