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Temporal range: Upper Carboniferous – Recent
Urechis caupo
Scientific classification
Kingdom: Animalia
Phylum: Annelida
Class: Echiura
Newby, 1940

The Echiura, or spoon worms, are a small group of marine animals. They are often considered to be a group of annelids, although they lack the segmented structure found in other members of that group, and so may also be treated as a separate phylum.

However, phylogenetic analyses of DNA sequences place echiurans and Sipuncula within the Annelida.[1]

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