Umbraculum umbraculum from Jervis Bay

November 27, 2003
From: Sue Newson

Hi Bill,
I came across an Umbraculum umbraculum today and thought you would like this photo for your Forum.
The site where it was found is not a dived area, although I dived it 3 times over the weekend. Two night dives and a day dive.
The bottom composition is silt with small coral trees, clumps of ascidians, sargassum trees as well as a few scallops. It has a depth of 12m and flat.
Location - Jervis Bay (southern side)
Depth 12m
Water Temp - 18*C
Time - 11am
Date - 24th November 2003

Sue Newson

snewson@shoal.net.au

Newson, S., 2003 (Nov 27) Umbraculum umbraculum from Jervis Bay. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11499

Dear Sue,
Thnaks for the interesting and unusual view of the head of Umbraculum. As I have said before, our knowledge of the external shape of the head region is based on the dissection of preserved animals and unfortunately when they are preserved they tend to contract and the muscular bosy wall becomes stiff and rigid, making interpretation of the anterior structures very difficult. I can find no intelligible drawings showing these features. In your photo the pair of yellow flaps which are joined to form a tube in the midline are oral flaps or tentacles on either side of the mouth.
Best wishes
Bill Rudman

Rudman, W.B., 2003 (Nov 27). Comment on Umbraculum umbraculum from Jervis Bay by Sue Newson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11499

Factsheet

Umbraculum umbraculum

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