(ofPlanorbis sampsoni Ancey, 1885)Sampson F.A. (1885). The Shells of Pettis County, Missouri. <em>Bulletin of Sedalia Natural History Society.</em> 1-30. page(s): 26, textfig. [details]
original description(ofPlanorbis sampsoni Ancey, 1885)Sampson F.A. (1885). The Shells of Pettis County, Missouri. <em>Bulletin of Sedalia Natural History Society.</em> 1-30. page(s): 26, textfig. [details]