Phyllidiopsis bayi is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Phyllidiidae.Bouchet, P. (2015). Phyllidiopsis dautzenbergi (Vayssière, 1912). In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2016-11-14.Brunckhorst D.J. (1993) The systematics and phylogeny of phyllidiid nudibranchs (Doridoidea). Records of the Australian Museum suppl. 16: 1-108. page(s): 64
Distribution This species was described from the Red Sea.Rudman, W.B., 1999 (January 14) Phyllidiopsis dautzenbergi (Vayssière, 1911). [In Sea Slug Forum. Australian Museum, Sydney. It is endemic to the southern Red Sea and the Gulf of Aden.Yonow, N., 2008. Sea Slugs of the Red Sea. Pensoft Series Faunistica, Volume 74. Sofia (Bulgaria) : Pensoft Publishers, p.222.
Description This nudibranch has a translucent white dorsum with black lines creating a central ring with lines running off at right angles to the margin. At the margin they widen slightly, giving the appearance of cut-off circular patches of white. It is a small Phyllidiid, growing to 20 mm in length.
Diet This species feeds on a sponge.
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