January 19, 2002
From: John Chuk
The shape of the egg-mass produced by the Trapania benni specimens was rather difficult to determine, as the egg ribbon was only 1-1.5mm in diameter. Underwater it appeared to be cylindrical but close examination of the slides I took does suggest that it is somewhat flattened.
I watched the specimens egg-laying for about 20 minutes and one of them did produce a spiral ribbon of about one and a quarter whorls on the blade of a small red alga but then it ran out of space and continued to lay the ribbon in a seemingly haphazard manner. This may suggest that the irregular nature of the substrate chosen to lay the eggs on has determined the resultant shape of the egg-mass, which, on a more even surface, may have had a more spiral arrangement. In this case any pattern to the egg-mass is complicated, by having two specimens laying eggs at the same time!
firstname.lastname@example.orgChuk, J., 2002 (Jan 19) Egg-laying Trapania benni from S.E. Australia (2). [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6042
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