Description: English: Pisidium clessini: inner side of left valve. Extinct freshwater bivalve. Danish Middle Pleistocene deposits. Date: 1904. Source: Johansen, A.C., 1904. Om den fossile kvartaere molluskfauna i Danmark og dens relationer til forandringer i klimaet. Land- og ferskvandsmolluskfaunaen. København, I_IV, 1-136, Fig. 1. Author: A.C. Johansen. Scanned by Tom Meijer, 2008 Licensing[
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