Phyllidiopsis bayi is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Phyllidiidae.Gofas, S. (2005). Phyllidiopsis bayi (Bouchet, 1983). In: MolluscaBase (2016). Accessed through: World Register of Marine Species on 2016-11-14.
Distribution This species was described from 38 m depth at Point La Revellata, Punta Bianca, Corsica .Rudman, W.B., 1999 (July 15) Fryeria bayi Bouchet, 1983. [In] Sea Slug Forum. Australian Museum, Sydney.
Description This nudibranch has a translucent white dorsum with brown flecks of pigment. It is a small Phyllidiid, growing to 8 mm in length, although the specimens were immature and the maximum size is unknown.
Diet This species feeds on a sponge.
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