Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"Chondrichthyes"”.
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Revisão taxonômica da família Rajidae no Brasil (Chondrichthyes, Elasmobranchii, Rajiformes)
A taxonomic review of the rajid fishes occurring in Brazilian waters were held. The taxonomic arrangement as well as recent captures of deep water specimens included in this study, increased in 37% the number of Brazilian Rajidae. New taxons and also new records of occurrence were described. A …
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The origin, interrelationship and distribution of Southern African Rajidae (Chondrichthyes, Batoidei)
The systematics of the Rajidae (skates) of southern Africa are revised, with a view to clearing up the confusion which now exists, and to forming a reliable basis for future biological studies. To date, some 150 - 160 species have been described for the genus Raja alone. The existing confusion …
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Exploring the TE landscape of elephant and CR1 accumulation, evolution and effects of selection in the class Chondrichthyes
… three representative genomes from the class Chondrichthyes (elephant shark, little skate and whale shark). They showed different patterns of CR1 accumulation in each genome. The whale shark genome consists of ~16% of its genome as CR1, while the little skate and elephant shark showed that 9% …
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Contribuição à taxonomia do gênero Psammobatis Günther, 1870 (Chondrichthyes, Rajidae): caracterização das espécies do subgrupo I de McEachran (1983) com base em padrões de coloração e espinulação
The genus Psammobatis Günther, 1870 is a South American endemic represented in both the Atlantic and Pacific coasts of the continent. It has been recently reviewed by McEACHRAN (1983), who divided the genus in two monophyletic groups. Subgroup I, composed of P. bergi Marini, 1932; P. …
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Effects of the late Permian mass extinction on chondrichthyan palaeobiodiversity and distribution patterns
… to marine invertebrates. This project focuses on Chondrichthyes, which, together with other marine fish, appeared to have been relatively unaffected by the extinction, while most of their supporting ecosystem collapsed. This study explores the authenticity of extinction among chondrichthyans and …
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From brain development to reproductive axis: an integrated study of the nervous system in cartilaginous fish
Cartilaginous fishes (Class Chondrichthyes), including sharks, rays, and chimaeras, represent one of the oldest extant vertebrate lineages, with origins exceeding 400 million years. Despite their ecological importance and key phylogenetic position, major gaps persist in our understanding of their …
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The processes for determining the risk factors involved with the morbidity and mortality of the Southern stingray, Dasyatis americana, at an aquarium
To view the abstract, please see the full text of the document.
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La riproduzione dei condroitti come elemento chiave per la loro conservazione e gestione nel Mediterraneo centro-occidentale
Chondrichthyes make up one of the oldest and most ecologically diverse vertebrate lineages: they arose at least 420 million years ago and rapidly radiated out to occupy the upper tiers of aquatic food webs (Compagno, 1990; Kriwet et al., 2008; Dulvy et al., 2013). Today, this group of predators …