Variation in Verconia verconis

February 8, 2000
From: Stuart Hutchison

Dear Bill,
Here are some more shots of Verconia verconis from South Australia to add to you collection.
The upper one is from Edithburgh [East side Yorke Peninsula], Jan 99, 3m eggmass, colour variation. The lower one is from Port Hughes [West side Yorke Peninsula] in Mid 98 and clearly has broader mantle appendages. This seems to be the usual difference between V. verconis on the eastern side of Yorke Peninsula and those on the western side.

Stuart Hutchison

Hutchison, S., 2000 (Feb 8) Variation in Verconia verconis. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Stuart,
I had a look through my records of Verconia verconis to see how they fitted to your idea of broader mantle appendages on the west of Yorke Peninsula and narrower on the east and found photos of both sorts occurring on Eyre Peninsula (to the west of Yorke Penin.) and both in Port Philip Bay, Victoria, (to the east of Yorke Penin).
It's possible the difference reflects the shape of the sponge they are on or perhaps whether they are well fed or not. Keep an eye on it, you may find an interesting explanation.
Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Feb 8). Comment on Variation in Verconia verconis by Stuart Hutchison. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Verconia verconis

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