Dirona albolineata from Canada

May 30, 2002
From: Linda Penny

Dear Dr. Rudman,
This photo of Dirona albolineata was taken by Tracy Meintjies in British Columbia, Canada. Unfortunately that is all the information I have on the photo. As always I was using your site to ID the nudibranch and noticed that in the photos on your file the cerata (if that is the correct word for the spikes) are narrow and appear quite flat. In Tracy's photo they seem larger and inflated. Is it just the angle of the photo or is there a reason for this?

Many thanks
Linda Penny

lindapenny@netactive.co.za

Penny, L., 2002 (May 30) Dirona albolineata from Canada. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7067

Dear Linda,
Please thank Tracy for this photo. Some species do seem to have more inflated cerata than others but I suspect that like many aeolids, the shape of the cerata is to some extent on the degree of contraction of the muscles in the ceratal wall. In an animal resting the relaxed muscle walls will allow the body fluid to to 'fatten' and shorten the cerata.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (May 30). Comment on Dirona albolineata from Canada by Linda Penny. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7067

Factsheet

Dirona albolineata

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