Hypselodoris festiva from Korea

October 24, 2002
From: Dong Bum,Koh


Dear Bill,
Here are two photos which I suspect are both of Hypselodoris festiva. But the shape & color pattern of the lower one is a little different when compared with a typical form [upper photo]. Could you give me ID about this? They are both from:

Moon islet in Che Ju island. Korea.
18m depth. May. 2000.
Photo: Dong Bum,Koh

Best regards,
Dong Bum, Koh

drkoh@seasee.co.kr

Koh, D.B., 2002 (Oct 24) Hypselodoris festiva from Korea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8232

Dear Dong Bum,
Baba (1995) discusses two colour forms of H. festiva but they revolve around the presence or absence of dark blue black spots, not the absence of yellow and orange pigmentation, as in your lower photo. However, considering how similar the general colour pattern is. I would think the most reasonable explanation is that the lower individual is an abnormal specimen in which the pigment which produces the orange and yellow markings is almost completely absent. A faint orange tinge on the rhinophores and gills would seem to support this idea. Of course a look at the anatomy might show differences but I suspect you would learn more by checking how abundant this pale colour form is, and whether it is feeding on the same sponge, and perhaps aggregating with more typical colour forms of H. festiva.

• Baba, K. (1995). Anatomical and taxonomical review of four blue-patterned species of Hypselodoris (Nudibranchia: Chromodorididae) from Japan. Venus (Japanese Journal of Malacology), 54(1): 1-15.

Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Oct 24). Comment on Hypselodoris festiva from Korea by Dong Bum,Koh. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8232

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