Results 201 to 210 of about 6,095 (244)
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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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Journal of Fish Biology, 2012
The Subclass Elasmobranchii is widely considered nowadays to be the sister group of the Subclass Holocephali, although chimaeroid fishes were originally classified as elasmobranchs along with modern sharks and rays. While this modern systematic treatment provides an accurate reflection of the phylogenetic relationships among extant taxa, the ...
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The Subclass Elasmobranchii is widely considered nowadays to be the sister group of the Subclass Holocephali, although chimaeroid fishes were originally classified as elasmobranchs along with modern sharks and rays. While this modern systematic treatment provides an accurate reflection of the phylogenetic relationships among extant taxa, the ...
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Journal of Experimental Zoology, 1990
Man has been fascinated with elasmobranchs — the sharks, skates and rays — for centuries. The visual sense of these sometimes-dangerous creatures has been much maligned; elasmobranchs have been described as seeing poorly and only at night. Since the last large review on vision in elasmobranchs (Gruber and Cohen, 1978), the field has expanded greatly ...
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Man has been fascinated with elasmobranchs — the sharks, skates and rays — for centuries. The visual sense of these sometimes-dangerous creatures has been much maligned; elasmobranchs have been described as seeing poorly and only at night. Since the last large review on vision in elasmobranchs (Gruber and Cohen, 1978), the field has expanded greatly ...
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A Neurohypophyseal Principle in the Elasmobranch Pituitary
Nature, 1960THE elasmobranch pituitary gland consists of three distinct and largely separate regions (Fig. 1). Two of these, the rostral and ventral lobes, appear to represent the pars anterior of higher vertebrates, while the third, the so-called neurointermediate lobe, consists of intimately interdigitated neural and intermediate tissue1. Scharrer2 has described
A M, PERKS, M H, DODD, J M, DODD
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Anatomy and Embryology, 1985
The nephron and collecting ducts of the little skate (Raja erinacea) and spiny dogfish shark (Squalus acanthias) have been investigated by light microscopy of semi-thin sections. Parts of the tubules (collecting ducts and distal segments) were identified after tubular injections with Microfil or carbon.
E R, Lacy, E, Reale
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The nephron and collecting ducts of the little skate (Raja erinacea) and spiny dogfish shark (Squalus acanthias) have been investigated by light microscopy of semi-thin sections. Parts of the tubules (collecting ducts and distal segments) were identified after tubular injections with Microfil or carbon.
E R, Lacy, E, Reale
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Osmoregulation in elasmobranch fish — A review
Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2007In recent years our understanding of the control of ion and urea metabolism in elasmobranch fish has increased with many more species being investigated. This has demonstrated that some species regarded previously as stenohaline marine are, at least partially, euryhaline and may survive in environments less concentrated than full seawater.
Hazon, N. +5 more
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Adaptive mechanisms in the elasmobranch hindbrain
Journal of Experimental Biology, 1999ABSTRACT The suppression of self-generated electrosensory noise (reafference) and other predictable signals in the elasmobranch medulla is accomplished in part by an adaptive filter mechanism, which now appears to represent a more universal form of the modifiable efference copy mechanism discovered by Bell. It also exists in the gymnotid
, Bodznick, , Montgomery, , Carey
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2011
Few studies of sex differentiation in elasmobranchs exist. Chieffi's comparative work on Torpedo ocel/ata, T. marmora/a, and Scy!iorhinus canicula are the most complete, and his comparisons with other published accounts of sex differentiation (Picon 1962) show parallels.
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Few studies of sex differentiation in elasmobranchs exist. Chieffi's comparative work on Torpedo ocel/ata, T. marmora/a, and Scy!iorhinus canicula are the most complete, and his comparisons with other published accounts of sex differentiation (Picon 1962) show parallels.
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Genetic damage in elasmobranchs: A review
Environmental Toxicology and PharmacologyDNA integrity is crucial for organismal health, and assessing DNA damage in aquatic organisms is essential for identifying environmental threats and informing conservation efforts. Pollutants such as metals, hydrocarbons, agrochemicals, pharmaceuticals, and climate change are linked to genetic damage, oxidative stress, and mutagenesis in several ...
Mateus Brandão, Marques +2 more
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