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]
Echiura Media
Иллюстрация к статье Эхиуровые из энциклопедии Брокгауза и Ефрона
Characteristic forked proboscis of an echiurian worm in the Maldives
Bonellia viridis, female
Spoon worms at a market in South Korea
A worm of the family Bonelliidae
Ochetostoma erythrogrammon, family Echiuridae
Arhynchite hayaoi, family Thalassematidae
_PC301461.JPG)
References
- ↑ Struck, TH. Annelid phylogeny and the status of Sipuncula and Echiura. BMC Evolutionary Biology 7 (2007-05-27)BioMed Central. p. 57. doi:10.1186/1471-2148-7-57.