Traits taxon 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 
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