Favorinus blianus - first record from W. Atlantic

June 21, 2001
From: Paul Young

We're not sure if this is another Flabellina salmonacea. It was photographed at Fort Wetherhill, Jamestown, Rhode Island. [USA, Atlantic coast].

The animal is 2-3 cm long.

Paul Young

young@underwater.org

Young, P., 2001 (Jun 21) Favorinus blianus - first record from W. Atlantic. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4624

Dear Paul,
When I first saw this photo the white Y-shaped pattern on the head reminded me of Flabellina lineata which is only known from the northeastern Atlantic. However after a couple of days thinking about it I am pretty sure it is another species, Favorinus blianus which as far as I know is another species which has only been found in the northeastern Atlantic.

The only thing I am not quite sure of is the shape of the rhinophores, which in F. blianus have three large swollen rings. The shape is not clear in your photo [which I've enlarged alongside] but there does appear to be a large swelling below the white tips which could be the rings contracted into a 'lump'. If you have another photo which shows the rhinophores more clearly it would be very welcome.

I am very glad I asked you to share some of your photos with us. They are certainly proving to be very interesting.
best wishes,
Bill Rudman

Rudman, W.B., 2001 (Jun 21). Comment on Favorinus blianus - first record from W. Atlantic by Paul Young. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4624

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