elasmobranchii

WORDNET DICTIONARY

elasmobranchii(n = noun.animal) selachii, subclass elasmobranchii, subclass selachii - sharks; rays; dogfishes; skates;

is a member of chondrichthyes, class chondrichthyes

is a kind of class

elasmobranchii, n. pl. [NL., fr. Gr. a metal plate + L. branchia a gill.].

A subclass of fishes, comprising the sharks, the rays, and the Chimæra. The skeleton is mainly cartilaginous. [1913 Webster]