Chromodoris coi laying eggs

January 23, 2007
From: Pasquale Pascullo

Hello Bill;
I found this animal laying eggs, and was able to get a side view/shot and actually see the eggs leaving the side of body. I always see shots of the eggs under an animal as the ribbon is being formed? I must also ask, do these eggs evolve, hatch, how long before they ?? do they get eaten?
This was laid out in the open, on a rock, which was laying on sand, in a strong current.

Locality: Ningaloo Reef , 30ft, Exmouth, Australia, Indian Ocean, Oct 2006. Photographer: Pasquale Pascullo.

Pasquale Pascullo

Pascullo, P., 2007 (Jan 23) Chromodoris coi laying eggs. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Pasquale,
It's nice to get another record of Chromodoris coi laying this characteristic egg ribbon. As you can see clearly in an earlier message [#7229], this species has extracapsular yolk in its egg ribbon.

Concerning your other questions, I haven't found the time yet to prepare a page on larval development, but if you go to General Topics Index [Index at top left of each page] you will find a heading Life history, reproduction, mating and eggs which will lead you to some information on these topics. If anyone wishes to contribute some background Fact Sheets in this area they would be very welcome

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Jan 23). Comment on Chromodoris coi laying eggs by Pasquale Pascullo. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


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