Re: Okenia rosacea - feeding & breeding

December 14, 2005
From: Jeff Goddard

Hi Bill,
Concerning your comments on message #15458:
Good eye on direction of egg mass laying by Okenia rosacea. As described by Donald Costello in 1938, the egg mass of this species "is deposited ... beginning at the outermost point on the outside whorl, and proceeding in a counterclockwise direction (viewed dorsally) toward the origin or pole." I have not caught a specimen in the act of egg laying, so have not noticed this myself, and to my knowledge, this method of egg mass deposition has not been mentioned for O. rosacea in the literature since Costello's description.

Kevin Lee's great photos also show nicely the egg ribbons laid flat, rather than on edge, a trait shared in the northeast Pacific Ocean with at least Doriopsilla gemela, Crimora coneja, Limacia cockerelli, and a new, deepwater species of Baptodoris that I found off the Washington coast in 2004 and which Sandra Millen is describing.

  • Costello, D.P. 1938. Notes on the breeding habits of the nudibranchs of Monterey Bay and vicinity. Journal of Morphology, 63: 319-344.

Best wishes,

Goddard, J.H.R., 2005 (Dec 14) Re: Okenia rosacea - feeding & breeding. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Thanks Jeff,
Another good example of how little we know about even one of the 'flagship' species of one of the most studied faunas in the world. I'm glad Jim Lyle urged Kevin to send in the photo.
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Dec 14). Comment on Re: Okenia rosacea - feeding & breeding by Jeff Goddard. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


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