>I believe the WBD systematics are a bit dated<
Yes-they do not list Monoplacophora (which some current classifications would split up), and the bivalve ordinal groupings seem to more or less match the 1969 Treatise on Invertebrate Paleontology groupings. Changes include rearranging the Pteriomorphia (molecular data and some morphology points to a Pterioidea-Pinnoidea-Ostreoidea versus Pectinoidea-Plicatuloidea-Anomioidea-Limoidea split, not Ostreoidea by itself) and splitting the Myoida up within Veneroida.
Dr. David Campbell
Old Seashells
University of Alabama
Biodiversity & Systematics
Dept. Biological Sciences
Box 870345
Tuscaloosa, AL 35487-0345 USA
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That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa