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| Echiura Temporal range: Upper Carboniferous – Recent | |
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| Urechis caupo | |
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| Class: | Echiura Newby, 1940 |
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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. view more...
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