Ceratosoma gracillimum
Semper in Bergh, 1876

Order: NUDIBRANCHIA
Suborder: DORIDINA
Superfamily: EUDORIDOIDEA
Family: Chromodorididae

DISTRIBUTION

Published records from Great Barrier Reef, Philippines, Vietnam. Probably tropical Western Pacific.

PHOTO

UPPER: Channel between Wistari Reef and Heron Id, Queensland, May 1981. 43mm long alive. Photo: Bill Rudman.
LOWER: Heron Is, Queensland, December 1981. 65mm long alive. Photo: G. Avern.

Ceratosoma gracillimum can be distinguished externally by the complete absence of the mantle edge between the head and the well-developed lateral lobes on each side, just in front of the gills. Can grow up to about 12cm in length.

References:
• 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: 115-273.
• Rudman, W.B. (1988) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: the genus Ceratosoma J.E. Gray. Zoological Journal of the Linnean Society, 93(2): 133-185

Authorship details
Rudman, W.B., 2000 (September 17) Ceratosoma gracillimum Semper in Bergh, 1876. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/ceragrac

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