Introduction to the classification of elasmobranchs

Nair, Rekha J and Zacharia, P U (2015) Introduction to the classification of elasmobranchs. [Teaching Resource]

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Abstract

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.

Item Type:	Teaching Resource
Uncontrolled Keywords:	classification; elasmobranchs
Subjects:	Elasmobranch Fisheries Marine Ecosystems > Coral Reefs > Taxonomy
Divisions:	CMFRI-Kochi > Marine Capture > Demersal Fisheries Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Demersal Fisheries Division CMFRI-Kochi > Marine Capture > Demersal Fisheries Division Subject Area > CMFRI-Kochi > Marine Capture > Demersal Fisheries Division
Depositing User:	Arun Surendran
Date Deposited:	23 Jun 2015 06:07
Last Modified:	09 Sep 2015 16:01
URI:	http://eprints.cmfri.org.in/id/eprint/10421

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