(ofPlanorbis (Gyrorbis) angulatus Clessin, 1877 †)Clessin, S. (1877). Die tertiären Binnenconchylien von Undorf. <em>Correspondenz-Blatt des zoologisch-mineralogischen Vereines in Regensburg.</em> 31 (3), 34-41. page(s): 40 [details]
original description(ofPlanorbis (Gyrorbis) angulatus Clessin, 1877 †)Clessin, S. (1877). Die tertiären Binnenconchylien von Undorf. <em>Correspondenz-Blatt des zoologisch-mineralogischen Vereines in Regensburg.</em> 31 (3), 34-41. page(s): 40 [details]
additional sourceClessin, S. (1885). Die Conchylien der Obermiocaenen Ablagerungen von Undorf. <em>Malakozoologische Blätter, Neue Folge.</em> 7 (2): 71-95., available online athttps://www.biodiversitylibrary.org/page/35594668 page(s): 91 [details]
Present Inaccurate Introduced: alien Containing type locality
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