Egg mass of Glossodoris vespa

November 10, 2007
From: Gary Cobb

Hi Bill and everyone!
Concerning your request in message #21049 - Well the wait is over. After 6 days of observing, a 38 mm long Glossodoris vespa has finally laid an egg mass. Measurements are indicated on the photos. The mass in upright and sloping inward. There are two whorls. The yolks are about .25 mm in diameter and are cream in colour. Note how gravity has pulled all the yolks to the bottom of the egg capsule which is clear and have no extra-capsular yolk. Also note two photos were taken from the the ventral view and you can see the tops raising out of focus.

Locality: Old Woman Island, Mooloolaba, Sunshine Coast, 14 m, Queensland, Australia, Pacific Ocean, 09 November 2007, Subtidal. Length: 38 mm. Photographer: Gary Cobb.

I hope this observation can of be useful.
Gary Cobb

Cobb, G.C., 2007 (Nov 10) Egg mass of Glossodoris vespa. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Gary,

Thanks very much. This egg mass fits Nerida Wilson's report so its very good to get some illustrations of it. She reports the development to be ametamorphic which means the larvae, as they develop, don't go through a veliger stage. The egg just begins to divide and gradually develops directly into a small crawling slug. Its interesting to see an example of an egg ribbon in which the  ribbon slopes inwards.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Nov 10). Comment on Egg mass of Glossodoris vespa by Gary Cobb. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Glossodoris vespa

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