Ceratosoma trilobatum from Thailand

April 23, 2000
From: Narongpon Sittithaweepat

Dear Bill
I am not sure if this specimen is Ceratosoma tenue. I found it at Similan Island. The photo is by Dr. Thon Thamrongnawasawat. It is found all over Thailand. So could you identify it for me, please.
Thank you,
Narongpon

chromodorid@thaimail.com

Sittithaweepat, N., 2000 (Apr 23) Ceratosoma trilobatum from Thailand. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2213

Dear Narongpon,
Your photo is of Ceratosoma trilobatum. Ceratosoma trilobatum and Ceratosoma tenue have caused some confusion in the past because they have a similar range of colour variation. One simple external difference is the number of mantle lobes. 'trilobatum' means 'three lobes' and that species has one large lobe on each side [= 2 lobes] and the large posterior recurved horn behind the gills [total = 3 lobes].

Ceratosoma tenue differs in having a second smaller lobe on each side of the mantle between the head and the gills [a total of 5 lobes].

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Apr 23). Comment on Ceratosoma trilobatum from Thailand by Narongpon Sittithaweepat. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2213

Factsheet

Ceratosoma trilobatum

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