Jorunna funebris on food sponge

April 29, 2008
From: Kenneth Yong

Dear Bill,

Here are 2 photos of Jorunna funebris feeding on a blue-gray sponge (the same species?), taken on 2 different dates at the same locality.

Locality: Tulamben, The Liberty Wreck, 8-10 m, Bali, Indonesia, Java Sea, 09 August [upper & centre left] and 11 August [lower and center right], 2006, On shipwreck. Length: 5-7 cm. Photographer: Kenneth Yong.

Hope they're of interest to you.

Thanks!

Cordially,
Kenneth

kyong67@tiscali.it

Yong, K., 2008 (Apr 29) Jorunna funebris on food sponge. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20664

Dear Kenneth,
I am always keen to get 'activity' shots like this. I am sure these sponges are both the same species. At present I have two, or perhaps three, names for blue sponges which Jorunna funebris feeds on. I suspect they may be all the same species. Hopefully we can get a sponge expert familiar with his group of sponges to help.

Your photos show one of the difficulties in onserving nudibranchs feeding on sponges. In the lower phoyo ypou can see that much of the sponge colony has been hidden under a layer of sand and only that bit being eaten by the nudibranch has had the sand removed. The sponge in the upper photo shows how the sponge deals with the problems of being covered with sand. Ypu can see a string of mucus with sand grains entangled in it. To clean itself the sponge colony exudes a thin layer of sticky mucus which entangles the sand grains and lifts them off the colony. The mucus layer [+ sand grains] gradually breaks up and falls of the colony.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Apr 29). Comment on Jorunna funebris on food sponge by Kenneth Yong. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20664

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