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.
Echiura
Wikipedia article on this group of marine worms that burrow into mud or sand or live in empty shells.
Introduction to the Echiura
Introduction to this small phylum, closely related to the Annelids, from UCMP Berkeley.
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