Chromodoris coi - extra-capsular yolk?

June 16, 2002
From: Kheong Sann Chan

Here are some more photos from Pulau Dayang off the east coast of west Malaysia.

There were a fair number of Chromodoris coi around. Here are some shots of one laying eggs.

Location: Dayang, Pulau Lang
Date : 8 June, 2100
Depth : 15+m

Kheong

kschan@mail.dsi.nus.edu.sg

Chan, K.S., 2002 (Jun 16) Chromodoris coi - extra-capsular yolk?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7229

Dear Kheong,
Thanks for the photo. While preparing your photos noticed an peculiar feature so I have included a blow up of part of the egg mass. Apart from the whitish specks, which are the individual eggs, you can see scattered yellow patches. I think these patches are yolk material - a phenomenon known as extra-capsular yolk. Have a look at Scott Johnson's earlier message on the topic. I can't find any reference to C. coi in Boucher's (1983) paper on the topic so this may be a new observation.

• Boucher, L.M. 1983. Extra-capsular yolk bodies in the egg masses of some tropical Opisthobranchia. Journal of Molluscan Studies, 49(3): 232-241.

Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Jun 16). Comment on Chromodoris coi - extra-capsular yolk? by Kheong Sann Chan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7229

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