Re: Thuridilla picta from Cozumel, Mexico

January 8, 2004
From: Richard Goodman

Funny, I saw exactly the same scene as Paul did -- I was in Cozumel just last week as well, and likewise saw the same species roaming through the same kind of green algae grass. I was thrilled to see them (on my last dive there no less -- at about 20-25 feet, at the Colombia Shallow site, to be specific), though from Paul's comments I can see that they may not be that hard to find after all -- once you know where to look!! They are truly spectacular, and Paul's images (among others) really do a great job of capturing their beauty. Oh, one small possible correction -- I believe Paul states "20m" in his comments, but perhaps that should actually be 20 feet?

Thanks for two truly fabulous websites (yours and Paul's both)!!


Goodman, R., 2004 (Jan 8) Re: Thuridilla picta from Cozumel, Mexico. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Thanks Rick,
I checked with Paul and he confirms the depth was 20 metres. I guess they are likely to be found whereever the algae they feed on lives. And one limiting factor for the algae will be the depth to which sufficient light can penetrate for photosynthesis to occur.
Bill Rudman


Thuridilla picta

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