Discodoris? or Flatworm? from Victoria

February 14, 2000
From: David Freemantle

Dear Bill
I wonder if you could help me in the identification of the sea slug in the attached image, taken at Portsea Pier, Port Philip Bay, Victoria (night), 3 years ago. Although not visible in the image, in the original slide there are small / partial extended gills visible next to the large white spot at the rear midline of the animal.

I am sorry there is not much else I can tell you as I only just rediscovered the slide and the memories are long gone.

Thanks,
Regards
David F.

scubadav@rock.upnaway.com

Freemantle, D., 2000 (Feb 14) Discodoris? or Flatworm? from Victoria. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1887

Dear David,
I wonder if the 2 things you can see in the original slide are really gills. My problem is that I have no idea of size, though I suspect 40-50mm wide by the size of the diver's glove.

My feeling is that it is a large flatworm - which wouldn't have gills at the back. Apart from the general shape the pair of small head tentacles clustered closely together at the front of the animal look much more like the head tentacles of a flatworm than a nudibranch. Have a look at my photo of Paraplanocera oligoglena a large flatworm found at least in eastern Australia. In the inset you will see the tentacles I am talking about.

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Feb 14). Comment on Discodoris? or Flatworm? from Victoria by David Freemantle. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1887

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