Cumanotus beaumonti - reproduction

April 20, 2010
From: Dominique Horst

Dear Bill,

An interesting time - Cumanotus beaumonti mating. I think one is laying eggs, but since Facelina annulicornis was also present, I can't really say who is the owner of the different egg masses.

Locality: Cagnes, 8 m, France, Mediterranean sea, 17 April 2010, sand. Photographer: Dominique Horst.

Kind regards,
Dominique

dominique.horst@wanadoo.fr

Horst, D., 2010 (Apr 20) Cumanotus beaumonti - reproduction. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/23524

Dear Dom,

I am not sure of the shape of the egg mass of Facelina annulicornis but we have an earlier photo from Italy [message #16466] of a very similar egg mass with Cumanotus, so my guess is that this is the egg mass of Cumanotus. Interestingly animals that live in sand and other soft sediments often have an egg mass like this with a single terminal attachment point. There is little point in having an egg ribbon that needs to be stuck down along one edge when you have only loose sand grains to stick it to. For example there is a photo of the sand-dweller Bullina lineata [message #8822] laying its very similar egg mass which is also attached by a deep anchoring thread at one end

Best wishes,
Bill Rudman

Rudman, W.B., 2010 (Apr 20). Comment on Cumanotus beaumonti - reproduction by Dominique Horst. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/23524

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