Echiura
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.
| Echiura Temporal range: Upper Carboniferous – Recent
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| Urechis caupo | |
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| Class: | Echiura Newby, 1940
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However, phylogenetic analyses of DNA sequences place echiurans and Sipuncula within the Annelida.[1]
References
- ↑ Struck, TH; et al. (2007-05-27). "Annelid phylogeny and the status of Sipuncula and Echiura". BMC Evolutionary Biology. BioMed Central. 7: 57. doi:10.1186/1471-2148-7-57. PMC 1855331. PMID 17411434.
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