Risbecia ghardaqana from sthn Thailand

January 25, 2003
From: Priscilla Yeo

Here is another nudibranch from southern Thailand that I have a problem trying to id.

Laoliang Yei, Trang, south Thailand. depth between 6-8 meters. Picture taken on 2nd January 2003

I am 99% sure that this is a Risbecia pulchella, but I am curious as to why this particular creature seemed to have lost most of its distinctive brownish honeycomb marking on its mantle. I have seen other specimens of R. puchella with typical colouring at the same site, but this little fella just seem to be a wee bit washed out...
Priscilla

prisla@singnet.com.sg

Yeo, P., 2003 (Jan 25) Risbecia ghardaqana from sthn Thailand. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8884

Note added 8 April 2003: Re-identified as Risbecia pulchella. See message.

Dear Priscilla,
If you look at the messages concerning both the small spotted Risbecia pulchella and the larger spotted Risbecia ghardaqana, it appears that both species occur in Thailand. It seems that as we learn more about the fauna of the northeastern Indian Ocean [Andaman Sea], we find it has much in common with the so-called endemic fauna of the northwestern Indian Ocean. I suspect this animal is Risbecia ghardaqana.
Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Jan 25). Comment on Risbecia ghardaqana from sthn Thailand by Priscilla Yeo. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8884

Factsheet

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