MolluscaBase name details
original description
(of Hemisinus sigmachilus Pilsbry & Olsson, 1935 †) Pilsbry, H. A. & Olsson, A. A. (1935). Tertiary fresh-water mollusks of the Magdalena Embayment, Colombia. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 87: 7-39.
page(s): 11-12, pl. 2, figs 10, 10a, 11 [details] Available for editors [request]
basis of record
Parodiz, J. J. (1969). The Tertiary non-marine Mollusca of South America. <em>Annals of Carnegie Museum.</em> 40: 1-242., available online at https://www.biodiversitylibrary.org/page/54645900
page(s): 141 [details] Available for editors [request]