Ceratosoma sp.? from Queensland

June 3, 2002
From: Greg Carter

Dear Dr Rudman,
I was on a dive recently at the Tangalooma Wrecks on Moreton Island, southern Queensland, Australia. At about 7/8 metres I came across what I think is a Ceratosoma of some type. I have looked through your species list but I'm not able to ID it at all. Any ideas would be appreciated.
Regards.
Greg Carter

greg.carter@epa.qld.gov.au

Carter, G., 2002 (Jun 3) Ceratosoma sp.? from Queensland. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7108

Dear Greg,
This is Ceratosoma trilobatum. For some reason it seems to have some quite spectacular colour forms at the subtropical extremes of its geographical range. There are a number of species of Ceratosoma with the same, or similar, variations in colour pattern. The best external distinguishing character for C. trilobatum is the edge of the mantle, which in this species forms an unbroken ridge around the mantle with one lateral extension on each side just anterior to the gill pocket. These two lobes, plus the posterior dorsal horn, behind the gills, give it the name 'trilobatum' or 'three lobes'.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Jun 3). Comment on Ceratosoma sp.? from Queensland by Greg Carter. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7108

Factsheet

Ceratosoma trilobatum

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