Feeding Risbecia tryoni from Vanuatu

October 29, 2009
From: Leanne and David Atkinson

Concerning message #19916:

Dear Bill,
Following on from the discussion of Risbecia tryoni and food here are some photos from Mele Reef in Vanuatu of one with its head buried in an overgrown sponge. We've taken it from different angles to help identify the sponge and whether it was feeding.

Locality: Aloara Wreck, Mele Reef, Hideaway Island, 20 metres, Efate Island, Vanuatu, Pacific Ocean, 14 April 2008, Coral Reef. Length: approximately 100 mm. Photographer: Leanne and David Atkinson.

Regards,
Leanne & David Atkinson

atk@hunterlink.net.au

Atkinson, D. & L., 2009 (Oct 29) Feeding Risbecia tryoni from Vanuatu. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22729

Dear Leanne and David,

Your photos well illustrate just how hidden the sponge colonies these chromodorids eat can be. Who would have thought that under the brownish dead-looking layer there could be living colonies. Your upper photo shows the purplish oral tube fully everted so the mouth - and teeth - can be extended down to the living sponge layer. I have included a couple of close-ups showing the sponge. In one of these all you can see is the net-like framework of spongin fibres which once formed the sponge's skeleton. I am sure this is the grey-blue species of dysideid we have found quite a few species of chromodorid feeding on [see Richard Swann's earlier message #19916]

Best wishes,
Bill Rudman

Rudman, W.B., 2009 (Oct 29). Comment on Feeding Risbecia tryoni from Vanuatu by Leanne and David Atkinson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22729

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