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Chondrichthyan Phylogeny: A Look at the Evidence
Journal of Vertebrate Paleontology, 1984ABSTRACT Chondrichthyans (sharks, rays and holocephalans) are subjected to cladistic analysis in order to identify possible monophyletic groups. Chondrichthyan monophyly is established on the basis of several apomorphic characters, of which the most convincing is the presence of a mineralized layer of prismatic perichondral tissue of a unique type ...
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The Effects of Fishing on Chondrichthyans
2016Global fishing activity is major threat to chondrichthyan (sharks, rays and chimaeras) populations. The effects of fishing are predominantly estimated by quantifying immediate and post-capture mortality rates. However, the true effect of fishing is likely to be underestimated, because measuring the mortality rates of released animals is logistically ...
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Mitigating Chondrichthyan Bycatch: Bibliography
2022NCRL subject guide ; 2023 ...
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Extinction vulnerability of chondrichthyans
CIESM workshop monographs, 2013Chondrichthyan species make up a relatively small group that has functioned successfully in diverse ecosystems for over 400 million years surviving various ecological catastrophes, including "Big five" mass extinctions. This group may now be threatened with extinction as a result of human activities and the conservative life history characteristics of ...
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Chapter 10 Reproduction of Chondrichthyans
2020Species of the class Chondrichthyes (sharks, rays, and chimaeras) exhibit diverse reproductive modes ranging from strictly lecithotrophic oviparity to viviparity with varying matrotrophic nutritional supplement (histotrophy, ovatrophy, adelphotrophy, and placentatrophy).
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Chondrichthyan Parity, Lecithotrophy and Matrotrophy
2011Species that exhibit histotrophy show considerable variation in the quality and quantity of uterine secretions. There is a general trend, however, from mucous to lipid histotrophy that is correlated with increased dry weight gain. There is a fine, indistinct line between lecithotrophic yolk sac viviparity and matrotrophic histotrophy.
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