Re: Hypselodoris apolegma mating

November 7, 2005
From: Arief Wiriadinata

Dear Mary Jane,

I think I found one of the Hypselodoris apolegma you found mating a month-and-a-half later already with their offspring [see message #15038 ]. I'm not sure, if the reproduction process takes that long?

Locality: TK1, Lembeh Strait. North Sulawesi, Indonesia. Depth: 10 meters. 23 October 2005. Photographer: Arief Wiriadinata

Cheers,
Arief

awiriadinata@gmail.com

Wiriadinata, Arief, 2005 (Nov 7) Re: Hypselodoris apolegma mating. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15184

Dear Arief,
Thanks for the photo. The length of time it takes from egg-laying to hatching varies from species to species, and we only know for a very few species. It can take between 10 days and 3 weeks or more. Some species hatch out of the egg ribbon as tiny crawling slugs, but animals with eggs as small as those of H. apolegma, hatch out of the egg as small swimming veliger larvae which swim and drift in the plankton for some weeks, where they feed on one-celled plants until they develop to a stage where they are able to settle out of the plankton back on to the sea bottom and become a crawling slug. The chance of them settling back near their parents is most unlikely, so I don't think the small one in your photo is the offspring of the large one, although a mother/father & child photo is a nice thought.
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Nov 7). Comment on Re: Hypselodoris apolegma mating by Arief Wiriadinata. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15184

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