Re: Pleurobranchaea brockii from Sydney

March 31, 2001
From: Erik Schloegl

Dear Bill,
The animal in the photographs appended to my previous message was about 7cm long, already taking into account that things appear bigger underwater. I would speculate that the reason it has been so rarely observed is that it is nocturnal, perhaps spending the day buried in the sand. Most "night" dives are conducted around sunset, while this specimen was observed quite a bit later, at least two, perhaps three hours (sorry I can't be more specific) after sunset, and I was surprised at how many different things I saw on that dive than on the usual night dives.
Best wishes,

Schloegl, E., 2001 (Mar 31) Re: Pleurobranchaea brockii from Sydney. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Thanks Erik,
Bill Rudman

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