original descriptionWesselingh, F.P. (2006). Molluscs from the Miocene Pebas Formation of Peruvian and Colombian Amazonia. <em>Scripta Geologica.</em> 133: 19-290., available online athttp://www.repository.naturalis.nl/document/41346 page(s): 154-156, figs 16a, c, 17k, 193-194 [details]