So this must by Phyllidia varicosa!

October 11, 2001
From: Des Paroz

Hi Bill
Following my other message on a species that I guessed as being Phyllidia coelestis, attached is a photo of a critter I deduce must be P. varicosa. It seems to have the tell tale light blue/grey ridge down the centre-line.

This was taken at a site off Tufi, PNG, called Goby's Cave, in the Five Star Reef. Depth was about 22m, and water temp about 27C.

Best regards
Des

des@paroz.com

Paroz, D., 2001 (Oct 11) So this must by Phyllidia varicosa!. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5429

Dear Des,
Yes this is P. varicosa. I have included an enlargement of the back end of your animal because it shows the anal papilla very well. Most dorids have a circlet of gills around the anus. However in phyllidiids, the dorsal gills are replaced by a set of gills which are found in the groove between the mantle and the foot [see nudibranch gills page]. Often the anus pore, and the papilla which extends out of it, are not visible in photos, and not easily seen if the animal is disturbed. This can be a problem, because the genus Fryeria, which differs from other phyllidiids in having its anus opening beneath the mantle skirt, has much the same shape, size and colour as these blue and yellow species of Phyllidia. So unless you know where the anus opens you can have a problem.
Best wishes,
Bill Rudman

Rudman, W.B., 2001 (Oct 11). Comment on So this must by Phyllidia varicosa! by Des Paroz. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5429

Factsheet

Phyllidia varicosa

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