Dear John,

Please note that the genus Roya placed by Millard in the Tylodinidae is
based on Roya Bertsch 1980, which is preoccupied by Roya Iredale, 1912. The
latter is a synonym of Williamia Monterosato, 1912 and belongs to the
Siphonariidae. A few years ago Bruce Marschall published an interesting
article concerning the nomenclature of Williamia, Roya and other small
Siphonariids.
However all this means that Roya sensu Bertsch is not available in the
Tylondinidae.

Best regards,

Henk K. Mienis

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----- Original Message -----
From: "John Jacobs" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, October 23, 2002 6:27 PM
Subject: Tylodindae


> Hello everyone,
> I'm doing some research on the family Tylodinidae for an article and I've
> discovered some systematic questions.  Millard lists 2 genera: Tylodina
> Rafinesque, 1819 & Roya Iredale, 1912.  An internet site also mentions
> Anidolyta Bertsch, 1980.  Is there an opinion on the validity, or
> nonvalidity, of these genera?  Also, does anyone know the citation for
> Anidolyta Bertsch, 1980?
>
> Any help will be appreciated.
>
> John Jacobs
> Seffner, FL
> [log in to unmask]
>
>