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
Urechis caupo
Scientific classification
Kingdom:
Animalia
Phylum:
Annelida
Class:
Echiura

Newby, 1940
Orders
  • Echiuroidea
  • Heteromyota
  • Xenopneusta

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

References
  1. Struck, TH; et al. (2007-05-27). "Annelid phylogeny and the status of Sipuncula and Echiura". BMC Evolutionary Biology. 7. BioMed Central: 57. doi:10.1186/1471-2148-7-57. PMC 1855331. PMID 17411434.


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