Risbecia pulchella vs. ghardaqana

April 5, 2002
From: Erwin Koehler


Dear Bill,
Attached are 2 shots from Thailand, one with the typical look of Risbecia pulchella [Lower], one with very large spots looking like Risbecia ghardaqana [Upper].

Data:
Upper: depth 19m, size 45mm, Racha Yai Island, 16 Dec. 2000
Lower: depth 14m, size 27+34mm, Koh Ha Yai Island, 27 Dec. 2000

Erwin

Erwin@medslugs.de

Koehler,E., 2002 (Apr 5) Risbecia pulchella vs. ghardaqana. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5853

Dear Erwin,
Thanks for these photos. Basically I can't say whether the big-spotted one is R. ghardaqana with a purple network on the mantle, or a R. pulchella with large spots. R. ghardaqana in thwe western Indian Ocean seems to lack the purple network we see in R. pulchella but I don't know if that is a variable character in the species or not. We clearly have a bit to learn about these animals. It would be very useful to know the usual things I ask about - what they eat, what their eggs look like etc., to see if we can find some biological differences.
Best wishes,
Bill Rudman.

Rudman,W.B., 2002 (Apr 5). Comment on Risbecia pulchella vs. ghardaqana by Erwin Koehler. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5853

Factsheet

Risbecia pulchella

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