Diaphorodoris luteocincta with a strange spot

April 23, 2008
From: Dominique Horst


Concerning message #21506:

Hi Bill,

This Diaphorodoris luteocincta has a strange dark red spot inside.
Could this be food or some damage, or something else...?

Locality: Antibes Cape, 12 m, France, Mediterranean sea, 19 April 2008. Length: 7 mm. Photographer: Dominique Horst.

Best regards,
Dominique

dominique.horst@wanadoo.fr

Horst, D., 2008 (Apr 23) Diaphorodoris luteocincta with a strange spot. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21537

Dear Dom,

It's a bit difficult to be sure, but there seems to be a similar spot in both animals so it's probably an anatomical feature. One possibility is that it is a spherical sac in the reproductive system called the bursa copulatrix which stores sperm and seminal fluid immediately after copulation. In many animals it has a dark brown wall rather than the usual translucent whitish colour. I am not sure if it is dark brown in D. luteocincta, but that would be my guess.

Concerning damage. I am surprised that both animals have quite a bit of damage to the mantle edge.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Apr 23). Comment on Diaphorodoris luteocincta with a strange spot by Dominique Horst. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21537

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