source of synonymyWingard L. (1993). A detailed taxonomy of Upper Cretaceous and Lower Tertiary Crassatellidae in the eastern United States — An example of the nature of extinction. <em>U. S. Geological Survey Professional Paper.</em> 1535: I-VI, 1-131; pl. 1-22., available online athttps://books.google.com/books?id=NEVSAQAAMAAJ page(s): 56 [details]
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