Re: Phyllidia madangensis? from New Caledonia

March 28, 2008
From: Jean-François Hervé


Concerning message #11192:

Dear Bill,

It seems easy to identify this nudibranch but I have a doubt between Phyllidia madangensis and P. carlsonhoffi. I don't see little tubercules. We can see the gill under the mantle.

Locality: Tépava, 14 m, Nouvelle-Calédonie, Pacific ocean, 14 october 07, sand. Length: 70 mm. Photographer: Jean-François Hervé.

Thank you for your help.
Jean-François Hervé

jfherve@free.fr

Hervé, J-F., 2008 (Mar 28) Re: Phyllidia madangensis? from New Caledonia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21068

Dear Jean-François,

This is rather different from Gary Cobb's animal. I am pretty sure it is Phyllidia varicosa rather than either of the species you mention. Although the tubercles can sometimes be bluish in P. carlsonhoffi, both it and P. madangensis usually have whitish tubercles, but more importantly the tubercles in both those species are scattered and separate from one another. In your animal the tubercles are in definite rows, and some in the centre of the mantle are joined to form part of a ridge. I am sure your animal is a variety of P. varicosa in which the ridges are partially broken.

It is nice to see the photo showing part of the band of secondary gills which run along each side of the body on the underside of the mantle skirt.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Mar 28). Comment on Re: Phyllidia madangensis? from New Caledonia by Jean-François Hervé. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21068

Factsheet

Phyllidia varicosa

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