Hypselodoris kanga feeding

May 10, 2007
From: Richard Swann


Hi Bill

I was reading Mike's post [#18901 ] and thought I would share a few images I took recently.

They display the yellow spots on the gills that you describe on Hypselodoris kanga and also a few close ups of H. kanga feeding.

Locality: Mamutik island,Kota Kinabalu, 11meters, Sabah, Borneo, South China Sea, 04 May 2007, sheltered reef. Length: 25mm. Photographer: Richard Swann.

I hope you find them an interesting addition to the forum.

Best regards
Richard

richard@downbelow.co.uk

Swann, R., 2007 (May 10) Hypselodoris kanga feeding. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19895

Dear Richard,
These are a wonderful addition not only to the Forum but also to our knowledge of the biology of these animals. We have a number of records of H. kanga feeding, and all of them are on this species of Dysidea. However none of them show the oral tube extended as well as this and none of them show the structure of the sponge skeleton as well as this. The sponges eaten by chromodorids lack the mineral skeleton of spicules found in most sponges and so looking for spicules in their stomach contents is a waste of time. In fact it is more than a waste of time and can be very misleading because loose siliceous sponge spicules from dead sponges are very common on the sea floor and are often incorporated in growing colonies of other organisms, or contaminate food as it is eaten. For example it is not unusual to find sponge spicules in the stomach of herbivores who swallow them with theri algal food.

The skeleton of these non-spiculate sponges consists mainly of bundles of fibres which are arranged in a network framework. The classification of these sponges is partially determined by the way these fibres are arranged and how diiferent arrangements are found in different parts of the sponge colony. So your Hypselodoris has done the sponge experts job by cleaning off the soft tissue from around the fibre bundles, so we can confirm its identity.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (May 10). Comment on Hypselodoris kanga feeding by Richard Swann. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19895

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