Trapania armilla is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae.
Distribution This species was first described from Bali, Indonesia.Rudman, W.B., 2008 (March 10) Trapania armilla Gosliner & Fahey, 2008. [In] Sea Slug Forum. Australian Museum, Sydney.
Description This goniodorid nudibranch is opaque white in colour, with a thin brown ring halfway along the oral tentacles. The gills are unusually large for a Trapania and the body is covered with raised irregular bumps.
Ecology Trapania armilla probably feeds on Entoprocta, which often grow on sponges and other living substrata.
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