Ceratosoma gracillimum is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.MolluscaBase (2018). Ceratosoma gracillimum Semper in Bergh, 1876. Accessed on 2019-01-30.
Description It differs from Ceratosoma trilobatum by having no strong, consistent mantle ridge between the head and the lateral lobes.
Distribution This species was described from Bohol, Philippines. It is known from Indonesia, Vietnam and the Great Barrier Reef, Australia.Rudman, W.B., 2000 (September 17) Ceratosoma gracillimum Semper in Bergh, 1876. [In] Sea Slug Forum. Australian Museum, Sydney.Rudman W.B. (1984) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: a review of the genera. Zoological Journal of the Linnean Society 81 (2/3): 115-273. References