Rostanga bassia is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Discodorididae.
Distribution This species was described from Flinders, Westernport Bay, Victoria, Australia.Rudman, W.B., 2002 (February 4) Rostanga bassia Rudman & Avern, 1989. [In] Sea Slug Forum. Australian Museum, Sydney.
Description This dorid nudibranch is bright orange to reddish-orange in colour, and the dorsum is covered with caryophyllidia. This species is very similar to other species of Rostanga.
Ecology This nudibranch is found on a colony of the red sponge, Clathria cactiformis (family Microcionidae) on which it presumably feeds. Most other species of Rostanga also feed on sponges of the family Microcionidae.
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