Plakobranchidae

Plakobranchidae
	A live individual of Elysia crispata, head end towards the lower right
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Heterobranchia; clade Euthyneura; clade Panpulmonata; clade Sacoglossa; clade Placobranchacea
Superfamily:	Placobranchoidea
Family:	Placobranchidae; Gray, 1840
Genera
	See text
Synonyms
	Plakobranchidae Gray, 1840; Actaeonidae Allman, 1845; Elysiidae Forbes & Hanley, 1851;

Placobranchidae is a family of sea slugs, marine opistobranch gastropod mollusks in the superfamily Placobranchoidea. They superficially resemble nudibranchs but they are sacoglossans, members of the clade Sacoglossa within the Opisthobranchia.

Taxonomy

Elysiidae was originally described as "Elysiadae" by Forbes & Hanley in 1851 in the book A history of British Mollusca and their Shells 3:613. In the taxonomy of Bouchet & Rocroi (2005), the family Elysiidae is considered to be a synonym of the family Placobranchidae Gray, 1840.

This family has no subfamilies.

Genera

Genera in the family Placobranchidae include^[2]^[3]:

Elysia Risso, 1818
Pattyclaya Marcus, 1982
Placobranchus van Hasselt, 1824 - type genus, the author have spelled it originally as Plakobranchus, but name Placobranchus is in prevailing usage.
Thuridilla Bergh, 1872

Two Placobranchus ocellatus seaslugs
Thuridilla carlsoni

References

^ Gray J. E. (1840). Shells of molluscious animals. In: Synopsis of the contents of the British Museum, ed. 42: 121, 148.
^ Jensen K. R. (1996). "Phylogenetic systematics and classification of the Sacoglossa (Mollusca, Gastropoda, Opisthobranchia)". Philosophical Transactions of the Rpyal Society London B Biological Sciences 351(1335 ): 91-122. doi:10.1098/rstb.1996.0006.
^ Händeler K., Grzymbowski Y. P., Krug P. J. & Wägele H. (2009) "Functional chloroplasts in metazoan cells - a unique evolutionary strategy in animal life". Frontiers in Zoology 6: 28. doi:10.1186/1742-9994-6-28 {{doi}}: unflagged free DOI (link).

[1] Gray J. E. (1840). Shells of molluscious animals. In: Synopsis of the contents of the British Museum, ed. 42: 121, 148.

[2] Jensen K. R. (1996). "Phylogenetic systematics and classification of the Sacoglossa (Mollusca, Gastropoda, Opisthobranchia)". Philosophical Transactions of the Rpyal Society London B Biological Sciences 351(1335 ): 91-122. doi:10.1098/rstb.1996.0006.

[3] Händeler K., Grzymbowski Y. P., Krug P. J. & Wägele H. (2009) "Functional chloroplasts in metazoan cells - a unique evolutionary strategy in animal life". Frontiers in Zoology 6: 28. doi:10.1186/1742-9994-6-28 {{doi}}: unflagged free DOI (link).

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