Halgerda orstomi is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk 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. https://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278 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 a specimen collected at Vanuatu at depths of 235–251 m and three Paratypes from the same area. Additional specimens included in the original description are from the Philippines and New Caledonia at depths of 92–120 m.
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