Alderia is a genus of sea slugs, marine gastropod mollusks in the family Limapontiidae. These are sacoglossan sea slugs.
The name Alderia first appeared in Thompson's 1844 Report on the fauna of IrelandThompson W. (1844). "Report on the fauna of Ireland: Div. Invertebrata. Drawn up, at the request of the British Association". Report of the British Association for the Advancement of Science 1844;1843: 245-291. as a nomen nudum (Allmann MSS).
Species Species within the genus Alderia include: Alderia modesta (Lovén, 1844) Alderia uda (Ev. Marcus & Er. Marcus, 1956) Alderia willowi Krug, Ellingson, Burton & Valdés, 2007
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