Tridachia crispata

Lettuce sea slug [English]
Lettuce nudibranch [English]
Common lettuce slug [English]
Elysia crispata Mörch, 1863
Elysia schiadura Mörch, 1863
Elysia verrilli Pruvot-Fol, 1946
Elysia pruvotfolae Er. Marcus, 1957