Traits taxon details
original description
(of Pachydon ovatus Conrad, 1871 †) Conrad, T. A. (1871). Descriptions of new fossil shells of the upper Amazon. <em>American Journal of Conchology.</em> 6: 192-198., available online at https://www.biodiversitylibrary.org/page/15854015 page(s): 197, pl. 10, fig. 4 [details]
original description
(of Pachydon tenua Gabb, 1869 †) Gabb, W. M. (1869). Descriptions of fossils from the clay deposits of the Upper Amazon. <em>American Journal of Conchology.</em> 4(4): 197-200., available online at https://www.biodiversitylibrary.org/page/16070306 page(s): 199-200, pl. 16, fig. 6, 6a [details]
basis of record
Wesselingh, F.P. (2006). Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia. <em>Scripta Geologica.</em> 133: 19-290., available online at http://www.repository.naturalis.nl/document/41346 page(s): 241-243, fig. 315 [details]
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