The Phylum Echiura

Etymology:- From the Greek Echis for Viper and Ura a tail.

Characteristics of Echiura:- 1)Bilaterally symmetrical and vermiform. 2)Body has more than two cell layers, tissues and organs. 3)Body cavity is a true coelom. 4)Body possesses a through gut with a mouth and anus. 5)Body possesses an extensible and contractile proboscis. 6)Has a simple simple nervous system with no brain but a ventral nerve chord. 7)Has a true circulatory system, closed or open. 8)Reproduction normally sexual and gonochoristic. 9)Feed on detritus. 10)All live in marine environments.

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