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.





Have You Seen The Other Earthlife Web Chapters
The Home Page of the Fish The Birds Home Page The Insects Home Page The Mammals Home Page The Prokaryotes Home Page The Lichens Home Page

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