The best reference is:

Smith, J.T., 1991. Cenozoic giant pectinids from California and the Tertiary
Caribbean Province: Lyropecten, "Macrochlamis", Vertipecten, and Nodipecten
species. - U.S. Geological Survey Professional Paper 1391.

*****************************************************
Henk H. Dijkstra (Hon. Res. Ass.)
c/o Department of Malacology, Zoological Museum, University of Amsterdam
P.O. Box 94766, 1090 GT Amsterdam, The Netherlands
E-mail: [log in to unmask]
----------------------
Private address:
Gravinneweg 12, 8604 CA Sneek, The Netherlands
E-mail: [log in to unmask]
*****************************************************


> Van: Ghost Sheller <[log in to unmask]>
> Beantwoord: Conchologists of America List <[log in to unmask]>
> Datum: Wed, 19 Jul 2000 12:57:04 PDT
> Aan: [log in to unmask]
> Onderwerp: Nodipectens: Questions regarding several species
>
> Hello,
>
> Could someone please me tell how to distinguish between the following
> Nodipecten species?
>
> arthriticus vs. subnodosus
> fragosus vs. nodosus
>
> In addition, I can find very little literature on arthriticus.  Does anyone
> know of any besides Reeve?
>
> Thank you in advance,
>
> Ghost Sheller
> [log in to unmask]
>
> ________________________________________________________________________
> Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com