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Cephalopod classification and taxonomy

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Relation http://eprints.cmfri.org.in/10414/
 
Title Cephalopod classification and
taxonomy
 
Creator Venkatesan, V
Mohamed, K S
 
Subject Cephalopods
Taxonomy
 
Description Chambered nautilus, cuttlefishes, squids and octopus are
the four major groups of cephalopods, which belong to the
highly evolved class of phylum Mollusca. Cephalopods are the
third largest molluscan class after bivalves and gastropods
and consist of more than 800 species (Lindgren et al. 2004).
The fossil record contains about 17,000 named species of
cephalopods. Although the diversity of cephalopods is very
much reduced in the modern era, cephalopods are found to
occur in all the oceans of the world from the tropics to the
polar seas and at all depths ranging from the surface to below
5000m. Cephalopods were dominant predators millions
of years before fish appeared. The earliest cephalopods
were primitive shelled nautiloids which evolved in the Late
Cambrian period. The living cephalopods range in size from
25mm (Southern pygmy squid, Idiosepius notoides) to more
than 12m (Colossal squid, Mesonychoteuthis hamiltoni) in
length.
 
Publisher CMFRI; Kochi
 
Date 2015
 
Type Teaching Resource
NonPeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/10414/1/09_V._Venkatesan1.pdf
Venkatesan, V and Mohamed, K S (2015) Cephalopod classification and taxonomy. [Teaching Resource]