Elysia Risso, 1818

Mehrotra, Rahul, Gutierrez, Manuel Caballer, Scott, Chad M., Arnold, Spencer, Monchanin, Coline & Chavanich, Suchana, 2020, On the Plakobranchidae (Gastropoda, Sacoglossa) from soft sediment habitats of Koh Tao, Gulf of Thailand, with descriptions of two new species, ZooKeys 969, pp. 85-121 : 85

Genus Elysia Risso, 1818

Diagnosis.

Body smooth to papillate, with parapodia that may cover much of the dorsal surface; however, parapodia can be highly variable and may not be held close to the body. Head differentiated from the body with eyes behind dorsal rhinophores. Dorsal sinuses usually branched, anus anterodorsal, reproductive system pseudo-diaulic or triaulic, penis normally unarmed although a hollow apical stylet may be present. Radular teeth blade-shaped ranging from denticulate to smooth.