Higher Classification: > Kingdom Animalia > Subkingdom Eumetazoa > Phylum Echinodermata > Subphylum Echinozoa > Class Echinoidea > Subclass Euechinoidea > Infraclass Aulodonta > Superorder Echinothuriacea > Order Echinothurioida > Family Phormosomatidae > Genus Phormosoma

Phormosoma placenta Thomson, 1872

Rank: Species
Taxon Status: accepted

Relationships towards this taxon

Genus group names

*Phormosoma*	Thomson, 1872	accepted genus name

Children

Phormosoma placenta sigsbei A. Agassiz, 1880

Vernaculars (+) (-)

English: flattened sea urchin sources: National General Status Working Group [Groupe de travail national sur la situation générale]. (2017). Standardized Common Names for Wild Species in Canada [Noms communs normalisés pour les espèces sauvages au Canada].

French: oursin galette

Literature

original description	Thomson, [C.] W. (1872). On the Echinidea of the 'Porcupine' Deep-sea Dredging-Expeditions. Proceedings of the Royal Society of London. 20 (137): 491-497.
basis of record	Hansson, H.G. (2001). Echinodermata, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels,. 50: pp. 336-351.
additional source	Mortensen, T. (1935). A Monograph of the Echinoidea. II. Bothriocidaroida, Melonechinoida, Lepidocentroida, and Stirodonta, 647 pp., C. A. Reitzel & Oxford University Press, Copenhagen & London.

Genbank

Citation

Kroh, A.; Mooi, R. (2025). World Echinoidea Database. Phormosoma placenta Thomson, 1872. Via: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvantidis, C.; Appeltans, W. (2011) European Register of Marine Species, Accessed through PESI at http://www.eu-nomen.eu/portal/taxon.php?GUID=urn:lsid:marinespecies.org:taxname:124343