# Plakobranchidae

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**Plakobranchidae** is a [family](/source/Family_(taxonomy)) of [sea slugs](/source/Sea_slugs), [marine](/source/Marine_(ocean)) [opisthobranch](/source/Opisthobranch) [gastropod](/source/Gastropod) [mollusks](/source/Mollusk) in the superfamily [Plakobranchoidea](/source/Plakobranchoidea).[2] They superficially resemble [nudibranchs](/source/Nudibranch) but they are sacoglossans, members of the [clade](/source/Clade) [Sacoglossa](/source/Sacoglossa) within the [Opisthobranchia](/source/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](/source/Taxonomy_of_the_Gastropoda_(Bouchet_%26_Rocroi,_2005)) (2005), the family Elysiidae is considered to be a synonym of the family Plakobranchidae Gray, 1840.

The original spelling Placobranchidae, based on *Placobranchus*, an incorrect subsequent spelling by [Férussac](/source/F%C3%A9russac) (1824) in a translation of van Hasselt's work. Franc (1968: 848) and Jensen (1996: 92) attributed the name to Rang, 1829 (p. 134), who used the vernacular "les Placobranches". Jensen (1997: 180-181) argued for the restoration of the spelling Plakobranchidae, and she has been followed by Wägele & Willan (2000: 91). Bouchet & Rocroi (2005: 133), argued that the spellings *Placobranchus* and Placobranchidae were in prevailing usage and were conserved under Art. 33.3.1. This view has been challenged by R. Burn and the spelling Plakobranchidae is now preferred.

This family has no subfamilies.

## Genera

Genera in the family Plakobranchidae are:[2]

- *[Bosellia](/source/Bosellia)* Trinchese, 1891
- *[Elysia](/source/Elysia_(gastropod))* Risso, 1818
- *[Plakobranchus](/source/Plakobranchus)* van Hasselt, 1824 – type genus
- *[Thuridilla](/source/Thuridilla)* Bergh, 1872

## References

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

1. "Plakobranchidae Gray, 1840". 2024. 411960. Retrieved 24 February 2024.

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