Order : SACOGLOSSA
Suborder : PLAKOBRANCHACEA
Superfamily : LIMAPONTIOIDEA
Family : Hermaeidae
Aplysiopsis sp. 1 = now Hermaea sp.
The general shape, and the enrolled thinophores with unequal lobes suggest this is a species of the Hermaeidae. Form the heavy pigmentation on the body it is most probably a species of Aplysiopsis but to be sure you would have to look at radular teeth. Aplysiopsis has very distinctive teeth (“sabot-shaped” with denticles on cutting edges). Hermaea have more “typical” sacoglossan teeth (blade-shaped, with or without minute lateral denticles), and usually the body is colourless, almost transparent.