Rubramoena rubescens is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Trinchesiidae.
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.
The typical adult size of this species is 12âÂÂ15 mm. It is very similar to Rubramoena amoena, apart from differences in the colour pattern.
Rubramoena rubescens feeds on hydroids of the genus Halecium especially Halecium halecinum.