Re: Hypselodoris apolegma with deformed gills

October 3, 2003
From: Asther M. Lau

Hi again,
I think this should be another Hypselodoris apolegma.

Found both crawling towards each other in such fast motion. Took them about less than 2 mins to reach each other from a distance of 30cm.

Site: Tenggol Is, Terengganu, Malaysia
Depth: 12 meter
Date: June 1st 2003
Size: Average 6cm to 8cm when crawling

Regards,
Asther M. Lau

diveworldwide@yahoo.com

Thanks Asther,
The gill shows branching very like the one in Ray's photo. I suspect this type of branching may be different from the usual abnormalities we have been recording on the Forum. Normally abnormally shaped organs or body parts appear to be the result of a mistake during development, or the result of attempted regrowth after physical damage. I suspect in this animal, however, that the branching of the gills is a function of the size of the animal. Just as some species of Glossodoris develop secondary gill spirals in larger animals, it seems that in H. apolegma some of the gills begin branching near the tip as the animal increases in size.
Best wishes
Bill Rudman

Rudman, W.B., 2003 (Oct 3). Comment on Re: Hypselodoris apolegma with deformed gills by Asther M. Lau. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11044

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