Re: Hypselodoris infucata feeding

September 12, 2006
From: Bruce Wilkie

Concerning message #15878:

Hi Bill,
Here are some photos of Hypselodoris obscura on a possible food sponge.

Locality: Shag Rock, Point Lookout, North Stradbroke Island., 10 metres, Queensland Australia, Pacific ocean, 12 August 2006, rocky reef with sponges, hard & soft corals . Length: 25mm. Photographer: Bruce Wilkie.

I hope they help.
Many thanks,
Bruce Wilkie.

brucedwilkie@yahoo.com.au

Wilkie,B, 2006 (Sep 12) Re: Hypselodoris infucata feeding. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/17448

Dear Bruce,

Firstly, I think this is the widespread Indo-West Pacific species H. infucata. I have been unsure about two regional Australian species,  Hypselodoris saintvincentius found in South Australia, and Hypselodoris obscura from New South Wales and southern Queensland, but Johnson & Valdés (2001) consider they have found differences. I must say that they each look a little different externally to the practised eye, but it is hard to put the differences in words. H. infucata usually can be distinguished from H. obscura in having dark patches down each side of the mantle. These sometimes merge, as in your animal, to a broad dark band down each side.

Concerning its food. I am sure it is feeding, but as often hapens the sponge it is intersted in his almost completely overgrown by the a white & pinkish colont of what looks like an ascidian. In the two close-ups I have ringed the few parts of the greyish sponge colony on which I suspect it is feeding. It is probably a dysideid, but I can't see enought to be sure.

  • Johnson, R. F. and Valdés, A. (2001) The Hypselodoris infucata, H. obscura and H. saintvincentius species complex (Mollusca, Nudibranchia, Chromodorididae), with remarks on the genus Brachyclanis Ehrenberg, 1831. Journal of Natural History 35: 1371-1398.

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Sep 12). Comment on Re: Hypselodoris infucata feeding by Bruce Wilkie. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/17448

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Hypselodoris infucata

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