Discodoris atromaculata from Adriatic

October 8, 2003
From: Adam Petrusek

Dear Bill,
To accompany my earlier message, here is another sea slug from the Adriatic Sea, taken at Vrulja on Makarska Riviera, Croatia, on September 16, 2003.

This is of Discodoris atromaculata on the sponge Reniera fulva. We have encountered this slug several times on this orange sponge. I wonder whether it sometimes eats it, or was it just "on the walk" there? depth ~ 20 m

Thanks for the help.
Adam Petrusek
Charles University
Prague, Czech Republic

petrusek@cesnet.cz

Petrusek, A,, 2003 (Oct 8) Discodoris atromaculata from Adriatic. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11148

Thanks Adam,
As far as I know, this species has only been reported to feed on Petrosia ficiformis. The only way to be sure is to look for signs of feeding - either holes in the sponge or mouthparts everted. You can check for everted mouth parts by gently pulling the slug off the sponge and see if there is a tube attached to the sponge. Usually if you disturb a slug while feeding you will see it withdrawing the tube back inside its mouth cavity
Best wishes
Bill Rudman

Rudman, W.B., 2003 (Oct 8). Comment on Discodoris atromaculata from Adriatic by Adam Petrusek. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11148

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