Thuridilla picta from Cozumel, Mexico

January 6, 2004
From: Paul Osmond

Dear Bill,
Here are some images of Thuridilla picta on its food source during a week of diving in Cozumel, Mexico [Sat 13 December, 2003].

We saw probably as many as 150 during the week - it was simply a matter of finding their food source (the algae/sea grass seen in this image) and then looking carefully to see if any specimans were on it.

They tended to be in about 20m of water, and on the top of the Cozumel reef walls. I didn't see any specimans much deeper than 20m nor any on the actual reef walls in Cozumel despite the abundance of their food source at depth.

Additional images taken of this species during this trip can be seen in my online gallery

Paul Osmond

Osmond, P., 2004 (Jan 6) Thuridilla picta from Cozumel, Mexico. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Thanks Paul,
I can't offhand find a reference to the algae this species eats, so your observation may be a new bit of information. Hopefully someone can help us identify it to species.
Best wishes
Bill Rudman


Thuridilla picta

Related messages

  1. Thuridilla picta from Caribbean coast of Mexico
    From: Todd Ashton, April 17, 2007
  2. Thuridilla picta from SE Florida, USA
    From: Linda Ianniello, March 7, 2007
  3. A Thuridilla? from the Canary Ids
    From: Ana Isabel, July 26, 2005
  4. Re: Thuridilla picta from Cozumel, Mexico
    From: Kathe R. Jensen, January 9, 2004
  5. Re: Thuridilla picta from Cozumel, Mexico
    From: Richard Goodman, January 8, 2004
  6. Thuridilla picta from Canary Ids
    From: Bianca Rijnders, July 29, 2003
  7. Painted Elysia from Mexico
    From: Maxi, August 12, 2002
  8. Thuridilla picta from the Bahamas
    From: Lindsay Warren, June 7, 2002

Show factsheet and all related messages