Halgerda formosa is a species of sea slug, a dorid nudibranch, shell-less marine gastropod mollusks in the family Discodorididae.WoRMS (2010). Halgerda formosa (Bergh, 1905). Accessed through: World Register of Marine Species on 2011-08-24.
Distribution This species was described from a specimen collected on the island of Réunion, Indian Ocean. It has subsequently been rediscovered there and on Mauritius. Rudman, W.B., 1999 (November 18) Halgerda formosa Bergh, 1880. [In] Sea Slug Forum. Australian Museum, Sydney.
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