Re: Hypselodoris apolegma mating

July 20, 2007
From: Asther Lau

Concerning message #15038:

Dear Bill,

I came across a similar behavior with 3 Hypselodoris apolegma, however, I'm not sure if they're mating or just sleeping. I couldn't see more unless I'd to touch them & move them a little. Hence, I decided to just shoot their photos.

Locality: Mabul Island, Approximately 16 metres, Sabah, Malaysia, Celebes Sea, 26 September 2007, Submerged reef, muck diving site. Length: Between 4cm to 6cm. Photographer: Asther Lau.

Hope these photos will be useful to the forum.

Regards,
Asther

asther@astherlau.com

Lau, A, 2007 (Jul 20) Re: Hypselodoris apolegma mating. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20206

Thanks Asther,
The top two animals appear to be mating - but as they say - 'three's a crowd'.

As I have mentioned before I suspect mating animals 'meet up' because they are both attracted to the same sponge colony. I think the unlucky third animal we often see near mating pairs is there, like the mating pair, mainly because of nearby food. I can't be sure, but I think the purplish colour on the rock in the close-up photo is their food sponge Euryspongia - but not the pinkish stuff on which the mating pair are sitting - which looks like a coralline algae.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Jul 20). Comment on Re: Hypselodoris apolegma mating by Asther Lau. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20206

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