Feeding Hypselodoris nigrostriata from Bali

October 28, 2008
From: Supapong Areeprasertkul

I have just come back from Bali and found that I cannot identify this one. The specimen is very similar to Hypselodoris nigrostriata only there are white tips of the rhinophores. The reference book of Helmut Debelius says the same without detailed identification.

Locality: Beach, 10 metres, Seraya, Bali, Indonecia, Bali, 15 August 2007, Sand bottom. Length: 4 cm. Photographer: Supasate Areeprasertkul.

Supasate Areeprasertkul

zybersup@gmail.com

Supasate, A., 2008 (Oct 28) Feeding Hypselodoris nigrostriata from Bali. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20528

Dear Art,

The main difference between Hypselodoris nigrostriata and H. zephyra is that the former has dark lines which cross diagonally, while in H. zephyra the lines are mainly parallel. Although in the Indian Ocean the rhinophores of H. nigrostriata don't seem to have a white tip, in the Indonesian region we have quite a few examples on the Forum with a white tip. As I have discussed before, the difference between these two species is debatable.

I would call your animal H. nigrostriata. We don't have much information on feeding in that species but both species seem to feed exclusively on a bluish sponge of the genus Dysidea. One of your animals has its oral tube everted and is clearly feeding on the same sponge. Compare it with message #21093 showing H. zephyra feeding. This is a nice additional bit of information on its natural history.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Oct 28). Comment on Feeding Hypselodoris nigrostriata from Bali by Supapong Areeprasertkul. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20528

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Hypselodoris nigrostriata

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