Rostanga byga is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Discodorididae.
Distribution This species was described from the Caribbean Sea. Its distribution includes also Rio de Janeiro State, southeastern Brazil.Rudman, W.B., 2006 (October18) Rostanga byga Er. Marcus, 1958. [In] Sea Slug Forum. Australian Museum, Sydney.
Description This doric nudibranch is bright orange to reddish orange in colour, and the dorsum is covered with caryophyllidia; it is very similar to other species of Rostanga. The colour is very uniform, but the rhinophores have white tips.Photographs of a specimen from Florida
The maximum recorded body length is 20 mm.Welch J. J. (2010). "The “Island Rule” and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. doi:10.1371/journal.pone.0008776.
Ecology The prey of Rostanga byga includes the sponge Mycale microsigmatosa.Belmonte T., Alvim J., Padula V. & Muricy G. (2015). "Spongivory by nudibranchs on the coast of Rio de Janeiro state, southeastern Brazil". Spixiana 38(2): 187–195. PDF. Recorded from depths of to .
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