Dear David,

The determination as to whether there was an
invalid emendation in this chresonymy hinges on
the Cossmann (1909: vol. 8), in which one would
expect to find the rationale for his nomen novum,
Pleuroceras, which is a junior homonym regardless of his intent.

Harry

Cossmann, 1895-1925. Essais de Paléontologie
comparée. Paris. 13 volumes Paris. [not seen; taken from Wenz, loc. cit.]


In any event both At 05:03 PM 1/4/2008, you wrote:
>I think there may be some historical confusion as to the proper stem
>for a family name based on Pleurocera, such that Pleuroceratidae was
>intended as a corrected spelling of Pleuroceridae rather than as a
>name based on Pleuroceras.  Rafinesque did not follow strict Greek and
>Latin when making his genera, leading to confusion when later writers
>tried to treat them as such.  Seems like someone, perhaps Morrison
>(1954), discussed this in print.  I find a few papers in a Google
>search that use for Pleuroceratidae for Pleuroceridae, including some
>by Pilsbry.
>
> > There appears to be lots of good anatomical and DNA data to support
> > the break up of the various freshwater cerithioids into families
> > etc.  To be sure there are still a bunch of problems as well but hey
> > what's new in that.
>
>In fact, the DNA data tend to suggest that freshwater forms have
>evolved more than once from marine ancestors in the Cerithioidea.
>Molecular sampling of many families isn't as good as would be
>desirable, but that wouldn't be too surprising in light of the many
>different brackish-water forms.
>
>--
>Dr. David Campbell
>425 Scientific Collections
>University of Alabama
>"I think of my happy condition, surrounded by acres of clams"

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