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Introduction to the classification of elasmobranchs

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Relation http://eprints.cmfri.org.in/10421/
 
Title Introduction to the classification
of elasmobranchs
 
Creator Nair, Rekha J
Zacharia, P U
 
Subject Elasmobranch Fisheries
Taxonomy
 
Description The term Elasmobranchs or chondrichthyans refers to the
group of marine organisms with a skeleton made of cartilage.
They include sharks, skates, rays and chimaeras. These
organisms are characterised by and differ from their sister
group of bony fishes in the characteristics like cartilaginous
skeleton, absence of swim bladders and presence of five
to seven pairs of naked gill slits that are not covered by an
operculum. The chondrichthyans which are placed in Class
Elasmobranchii are grouped into two main subdivisions
Holocephalii (Chimaeras or ratfishes and elephant fishes)
with three families and approximately 37 species inhabiting
deep cool waters; and the Elasmobranchii, which is a large,
diverse group (sharks, skates and rays) with representatives
in all types of environments, from fresh waters to the bottom
of marine trenches and from polar regions to warm tropical
waters with over 950 different species.
 
Publisher CMFRI; Kochi
 
Date 2015
 
Type Teaching Resource
NonPeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/10421/1/17_Rekha_J_Nair.pdf
Nair, Rekha J and Zacharia, P U (2015) Introduction to the classification of elasmobranchs. [Teaching Resource]