Home > Science > Biology > Flora and Fauna > Animalia > Echiura
Echiurans are marine worms whose bodies are not segmented. They have an extensible proboscis and a set of small hooks at the posterior end. There are about 150 species, mostly inhabiting warm shallow seas and burrowing in the soft sediment.
http://en.wikipedia.org/wiki/Echiura
Wikipedia article on this group of marine worms that burrow into mud or sand or live in empty shells.
http://www.ucmp.berkeley.edu/annelida/echiura.html
Introduction to this small phylum, closely related to the Annelids, from UCMP Berkeley.
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