Results 131 to 140 of about 1,233 (179)
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Diverse Activity Rhythms in Sharks (Elasmobranchii)
Journal of Biological Rhythms, 2020Sharks are an interesting group of vertebrates, as many species swim continuously to “ram” oxygen-rich seawater over their gills (ram ventilators), whereas other species “pump” seawater over their gills by manipulating buccal cavity volume while remaining motionless (buccal pumpers).
Michael L. Kelly +6 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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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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Journal of Morphology, 2021
Abstract The morphology of the articular region of the pectoral girdle and associated basals in Etmopteridae is revised in light of new evidence provided by taxa unavailable for previous studies. Such studies considered that etmopterids plesiomorphically had a single pectoral articular condyle, and only
João Paulo Capretz Batista Da Silva +1 more
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Abstract The morphology of the articular region of the pectoral girdle and associated basals in Etmopteridae is revised in light of new evidence provided by taxa unavailable for previous studies. Such studies considered that etmopterids plesiomorphically had a single pectoral articular condyle, and only
João Paulo Capretz Batista Da Silva +1 more
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Smooth muscle “microsphincters” in the gastric mucosa of stingrays (Elasmobranchii, Dasyatidae)
Journal of Fish Biology, 2023AbstractThe occurrence of smooth muscle sphincters around gastric gland tubules in the cardiac stomach of some elasmobranch species is reported for the first time. These “microsphincters” took the form of a twisted torus, approximately 12–16 muscle fibres thick, that could fully constrict the gland tubules.
Aaron C. Henderson +2 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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Dentine structure in the rostral teeth of the sawfish Pristis (Elasmobranchii)
Archives of Oral Biology, 1980Abstract Scanning and transmission electron microscopy showed that the osteodentine has a unique arrangement of matrix collagen fibres. Except in the regions immediately surrounding the pulp canals, where the fibres form a feltwork, the dentine is composed of thick bundles of closely packed, mineralized collagen fibres orientated parallel with the ...
R P, Shellis, B K, Berkovitz
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THE WIDESPREAD OCCURRENCE OF A CORTICOSTEROID 1α-HYDROXYLASE IN THE INTERRENALS OF ELASMOBRANCHII
Journal of Endocrinology, 1968SUMMARY A corticosteroid 1α-hydroxylase was demonstrated in interrenal tissue of eleven species of elasmobranchs by the production in vitro of 1α-hydroxycorticosterone from corticosterone, and in seven of nine species examined from endogenous precursors.
B, Truscott, D R, Idler
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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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