Spawn of Bulla ampulla?

April 25, 2002
From: Erwin Koehler

Dear Bill,
Attached are 2 shots of spawn which I think to be from Bulla ampulla
Philippines, Negros Oriental Island, Divesite "Dauin", 07.March 2002, size appr. 3cm, depth 8 m.


Koehler, E., 2002 (Apr 25) Spawn of Bulla ampulla?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Erwin,
I think this is its egg mass. The egg masses of the Californian Bulla gouldiana are described as looking like this and Kilburn & Rippey (1982)describe the spawn of Bulla ampulla as:
"The spawn is a long, bright yellow to orange, tangled string of jelly, containing a continuous string of tiny oval capsules. Each one contains 1-25 eggs, which develop into free-swimming veliger larvae".

I can't recall actually seeing B. ampulla spawning and the spawn mass of the temperate Australasian species Bulla quoyi is a jelly-like sphere, rather than a long cylinder.

• Kilburn, R. and Rippey, E., (1982) Sea Shells of Southern Africa. Macmillan South Africa, Johannesburg, 249 pp.

Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Apr 25). Comment on Spawn of Bulla ampulla? by Erwin Koehler. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Bulla ampulla

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