Rubramoena rubescens

Rubramoena rubescens is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusk in the family Fionidae.

Distribution
This species was described from St. John's Point, Dunkineely, County Donegal, Ireland. It has been reported from the NE Atlantic from Norway south to Cornwall.

Description
The typical adult size of this species is 12–15 mm. It is very similar to Rubramoena amoena, apart from differences in the colour pattern.

Habitat
Cuthona rubescens feeds on hydroids of the genus Halecium especially Halecium halecinum.