Aeolidiella alba from Mexico
March 27, 2002
From: Alicia Hermosillo
Dear Bill,
This specimen Aeolidiella alba is from Playa Mismaloya, Bahia de Banderas, states of Jalisco and Nayarit, Mexico [Pacific Coast]. Depth: 52 feet, Length: 5 mm. I have seen it under and on top of rocks.
In order to identify the first A. alba that I saw (and did not photograph then), I described it to taxonomist Dr. Sandra Millen as: "a little white spurilla like aeolid that moved in the funkiest kind of way, swaying the rinophores back and forth, kind of jumping instead of sliding smoothly". Sandra answered me in no time. Has any of you seen this? It is awesome.
Alicia
gueri25@hotmail.com
Hermosillo, A., 2002 (Mar 27) Aeolidiella alba from Mexico. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6542Dear Alicia,
I am interested in your description if it moving. I have notes of an animal I found in Coffs Harbour, New South Wales in eastern Australia some time ago. It was about 6mm long and had 7 rows of cerata. The cerata in the front 4 rows lay flat against the body, but the cerata in the posterior 3 rows stood upright. As the animal crawled along the upright cerata at the back, and the rhinophores, all jerked backwards and forwards in a rhythmic motion.
I have reported another aeolidiid, Limenandra nodosa, with a similar jerking movement. In that case it is the innermost ceras in each second row that jerk. In both animals it gives the appearance of the animal jerking along - or jumping - as you describe it. Interestingly, in your photo, the front 3 rows of cerata seem to be lying down, and the back 3 standing up, much as I described.
Like you, I would be interested in any other observations of this motion. Has anyone else seen this?
best wishes,
Bill Rudman
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