Elysia rufescens - Colour drawing of <i>Elysia rufescens</i> used by William Harper Pease in his original description of the species in 1871. © On the Sea Slug Forum page it states that this colour drawing was used by William Harper Pease, who died in 1871, in his description of this species of sea slug. - Public domain - Wikimedia Commons
Marine de la Réunion