Three versions of Ceratosoma sinuata

October 23, 2000
From: Scott Johnson


Note added 30 April 2007: Until now on the Forum C. sinuata and C. flavicostata have been considered forms of one species. See message #19854 where they and C. magnifica are considered separate species.

Hi Bill,

Attached are three versions of Ceratosoma sinuata from Hawaii (h197-6), the Marshall Islands (e180-1), and the Solomons (s026-1). I notice from the Forum that at least in Australia there seems to be some overlap between color forms (or species) in the same locale. Based on very limited sample
sizes, this may not be the case in the Marshalls and Hawaii. Both of the individuals of this species I found in Hawaii looked like h197. The 8 specimens from the Marshalls all resembled e180. I saw only the one specimen in the Solomons. Do you know if much color variation is present in other localized populations?

Scott

johnson@kmr.ll.mit.edu

Johnson, S., 2000 (Oct 23) Three versions of Ceratosoma sinuata. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3223

Dear Scott,
By coincidence, your message arrived when I was posting Bruce Potter's from the Solomons. His two colour forms do seem to be variations on one shape but I don't know of we could fit your Solomon's animal into the mold as well.

As I see more photos of these animals I, like you, are slightly hesitant to lump them all together. I can say that in New Caledonia, as in eastern Australia all colour forms and shapes occur. I don't have enough records from elsewhere to say anything sensible. Any comments from others would be welcome.
Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Oct 23). Comment on Three versions of Ceratosoma sinuata by Scott Johnson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3223

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Ceratosoma sinuatum

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