Very small chromodorid

November 14, 2003
From: Gary Cobb

Hi Bill!
Please find attached a photo of a 4mm nudibranch. Could it be Chromodoris lochi? Found on the Wall, Old Woman Is, Sunshine Coast, Qeensland, Australia. Depth 9m, Size 4mm, found on a rock water temp 22 degrees Celcius.

When I was photographing it it would turn AWAY from the light all the time and appear to try to get as far as possible from it. Is this a trait of this animal?
Do they try and avoid light and maybe try to hide?

Thanks for your help
Gary Cobb

gary@cobb.com.au

Cobb, G., 2003 (Nov 14) Very small chromodorid. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11379

Dear Gary,
At this size it is a bit difficult to be sure but I suspect it is C. lochi. Concerning sensitivity to light, it seems that many nudibranchs are 'negatively phototactic' - that is they move away from light. I guess this is a useful adaptation so they end up under rocks and overhangs which makes them less visible to predatory fish, and in intertidal regions it means they are in the shade and so less likely to dry out at low tide. However so few species have been studied that it would be wrong to say this is a general rule
Best wishes
Bill Rudman

Rudman, W.B., 2003 (Nov 14). Comment on Very small chromodorid by Gary Cobb. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11379

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Chromodoris lochi

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