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Acoela
Scientific classification
Kingdom:	Animalia;
Subkingdom:	Metazoa;
Phylum:	Acoelomorpha;
Class:	Acoela;
Families
	Actinoposthiidae; Anaperidae; Antigonariidae; Antroposthiidae; Childiidae; Convolutidae; Dakuidae; Diopisthoporidae; Hallangiidae; Haploposthiidae; Hofsteniidae; Isodiametridae; Mecynostomidae; Nadinidae; Otocelididae; Paratomellidae; Polycanthiidae; Proporidae; Sagittiferidae; Solenofilomorphidae; Taurididae;

Acoela is an order of animals treated either as a group of flatworms^[1] or as one of the two classes of the phylum Acoelomorpha, containing the majority of that phylum's species. It contains about 20 families.

As the most primitive bilateral animals, Acoela provide interesting insights into early animal evolution and development.^[2]^[3] The best studied animal in this group is the European species Symsagittifera roscoffensis.

[edit] References

^ Jimenez-Guri E, Paps J, Garcia-Fernandez J, Salo E (2006). "Hox and ParaHox genes in Nemertodermatida, a basal bilaterian clade". Int. J. Dev. Biol. 50 (8): 675–9. doi:10.1387/ijdb.062167ej. PMID 17051477. http://www.intjdevbiol.com/paper.php?doi=10.1387/ijdb.062167ej.
^ Hejnol A, Martindale MQ (2008), "Acoel development supports a simple planula-like urbilaterian", Phil. Trans. R. Soc. B 363: 1493–1501, doi:10.1098/rstb.2007.2239
^ Hejnol A, Martindale MQ (2008), "Acoel development indicates the independent evolution of the bilaterian mouth and anus", Nature 456: 382, doi:10.1038/nature07309

This acoelomorph-related article is a stub. You can help Wikipedia by expanding it.

[pmid17051477-0] Jimenez-Guri E, Paps J, Garcia-Fernandez J, Salo E (2006). "Hox and ParaHox genes in Nemertodermatida, a basal bilaterian clade". Int. J. Dev. Biol. 50 (8): 675–9. doi:10.1387/ijdb.062167ej. PMID 17051477. http://www.intjdevbiol.com/paper.php?doi=10.1387/ijdb.062167ej.

[1] Hejnol A, Martindale MQ (2008), "Acoel development supports a simple planula-like urbilaterian", Phil. Trans. R. Soc. B 363: 1493–1501, doi:10.1098/rstb.2007.2239

[2] Hejnol A, Martindale MQ (2008), "Acoel development indicates the independent evolution of the bilaterian mouth and anus", Nature 456: 382, doi:10.1038/nature07309

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