Ceratosoma with Periclimenes imperator

September 17, 2005
From: Corby James

This has been identified by some one as Ceratosoma tenue with Periclimenes imperator  and I would like confirmation please.

Locality: Lembeh Straights, N. Sulawesi, Indonesia. Depth: 80 ft. Length: approx. 4-5 cm. 22 August 2005. Sandy bottom covered in soft corals. Photographer: Corby James

Corby James


James, C., 2005 (Sep 17) Ceratosoma with Periclimenes imperator. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14726

Dear Corby,
The commensal shrimp is correctly identified, but I am not so sure with the Ceratosoma. Ceratosoma tenue has a lobe on each side about halfway between the rhinophores and the large mantle lobe alongside the gills. Ceratosoma gracillimum lacks such a lobe but also lacks any sign of a ridge along each side to mark the mantle edge. I think ther is a ridge in your specimen which would suggest it is C. trilobatum. Usually in C. trilobatum, that ridge is edged with the same colour as the lobe around the head and on each side of the gills, but there are specimens which don't have this colour. It's hard to be sure from your photo, but I am pretty sure it is C. trilobatum.
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Sep 17). Comment on Ceratosoma with Periclimenes imperator by Corby James. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14726

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