Cuthona kanga? from Philippines

December 23, 1998
From: Erwin Koehler


Dear Bill,
Here is the next one from Negros, Philippines (October 1998). The photos were made during a night-dive, there was some current and the hydroid with the slug on it was waving heavily. It took a lot of tries to get some good shots. Size about 1,5 cm, depth 13m. I think it looks a bit like Cuthona kanga.

Erwin
    

E.Koehler@deutschepost.de

Koehler, E., 1998 (Dec 23) Cuthona kanga? from Philippines. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/419

Dear Erwin,
Your photos certainly look like the species illustrated at the Fragile Ocean site in your Opisthobranchs of the World picture link site, but I don't think that animal is correctly identified.

Cuthona kanga (Edmunds, 1970) was described from Tanzania. It would appear to be a much smaller species (5mm long mature) and coloured rather differently. The body is essentially transparent with three opaque cream longitudinal bands, one dorsal and one on each side. The oral tentacles and rhinophores are colourless with white banding and white marks, not black as in your species. In your species the cerata are opaque white with gold and blue bands which are clearly epithelial colour. In C. kanga the cerata are translucent or transparent with a translucent gold band below the whitish tip. The blue colouration below the gold band is from the colour of the digestive gland duct.

Any other ideas on the identity of this species would be welcome.
Best wishes,
Bill Rudman.

Rudman, W.B., 1998 (Dec 23). Comment on Cuthona kanga? from Philippines by Erwin Koehler. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/419

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