Onchidoris bilamellata swarming in California

December 10, 2001
From: Clinton Bauder

Hi Bill,
Just wanted to send a note out saying that I saw several incredibly large aggregations of Onchidoris bilamellata in Carmel [California]today. They literally carpeted every square mm of the reef in places. I'll send some pictures when I get a chance. The two sites I saw them were Honeymoon Rocks which is just south of Point Lobos and Pescadero Point. Both aggregations were in about 30m of water.

Figured this might be of interest to the California branching crowd. This was a new branch for me. Pretty bizzare to not only find a new species but to literally see thousands of them!

Clinton

gecko1@apple.com

Bauder, C., 2001 (Dec 10) Onchidoris bilamellata swarming in California. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5798

Dear Clinton,
Considering that this animal is supposedly a resident of both sides of the North American continent and western Europe, sightings like this are not just of interest to the California crowd. I look forward to some photos. Hopefully they will help comfirm the identity of this 'swarmer'.

Best wishes,
Bill Rudman

Factsheet

Onchidoris bilamellata

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