Halgerda onna is a species of sea slug, a dorid nudibranch, shell-less marine gastropod mollusks in the family Discodorididae.Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdes A. & Warén A. 2005. Classification and nomenclator of gastropod families. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. . ISSN 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278WoRMS (2010). Halgerda onna Fahey & Gosliner, 2001. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=457328 on 2011-08-24 Dayrat B. 2010. A monographic revision of discodorid sea slugs (Gastropoda, Opisthobranchia, Nudibranchia, Doridina). Proceedings of the California Academy of Sciences, Series 4, vol. 61, suppl. I, 1-403, 382 figs.
Distribution This species was described from Onna Village, Okinawa.Halgerda onna on the Okinawa Slug Site, R.F. Bolland It is also reported from Guam.Rudman, W.B., 2001 (October 10) Halgerda onna Fahey & Gosliner, 2001. [In] Sea Slug Forum. Australian Museum, Sydney.
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