Baki's Egg coils

November 6, 2001
From: Bernard Picton

Hi Bill,
I think the top picture in Baki's spawn message is probably Haminoea (?navicula). The eggs in rows like this and shape of the coil are exactly the way I've seen the eggs of this species, it normally climbs up away from it's muddy substratum to lay the spawn on a prominent plant or animal.

The lower right spawn could be of almost any large Dorid, Geitodoris planata lays eggs with this sort of wavy top edge and so does Atagema gibba. In the Mediterranean there are a lot of other candidates.

In a separate message I've sent unpublished in situ photos of Atagema gibba and its spawn coil.

Picton, B.E., 2001 (Nov 6) Baki's Egg coils . [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Thanks Bernard,
Interesting to hear that the European Haminoea has such a 'flattened' egg coil. The common New Zealand species, Haminoea zelandiae, with which I am most familiar, has a soft jelly-like, sausage shaped egg mass containing a spiral string of bright yellow eggs.
Bill Rudman

Rudman, W.B., 2001 (Nov 6). Comment on Baki's Egg coils by Bernard Picton. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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