Chromodoris conchyliata from Thailand

April 6, 2000
From: N. Sittithaweepat

Dear Bill
I can't identify this nudibranch. I found it at Similan Island and photo by Dr. Thon Thamrongnawasawat. I don't record date and depth.
Thank you
Narongpon Sittithaweepat

Sittithaweepat, N., 2000 (Apr 6) Chromodoris conchyliata from Thailand. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Narongpon,
This is Chromodoris conchyliata. It is very similar in colour to Chromodoris geometrica which is found in the western Pacific and the Indonesian Archipelago. Chromodoris conchyliata is only known from the Indian Ocean, and until your photo, it was only recorded from the western Indian Ocean. Your find is very interesting because it brings the two species into much closer geographic proximity. It would be interesting to know if both species occurred in Thailand.

The most distinctive difference externally is that in Chromodoris conchyliata the gills and rhinophores are lined with red or reddish-orange and the pustules are often quite yellowish, while in C. geometrica the gills and rhinophores are greenish and the pustules are usually coloured cream. This is an interesting find.

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Apr 6). Comment on Chromodoris conchyliata from Thailand by N. Sittithaweepat. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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