KUMIP Holotypes - Pierce 1993

 Pierce, H.G., 1993, J. Paleont. V.67, no. 6, p. 980-993, figs. 1, 2: "The Nonmarine Mollusks of the Late Oligocene-Early Miocene Cabbage Patch Fauna of Western Montana. III. Aquatic Mollusks and Conclusions."

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