Almeida Guimaraes et al. have studied a sample of fossil freshwater gastropods from northwestern Brazil. Their abstract “This paper deals with the record of gastropods of the family Cochliopidae, genus Tryonia, from the Mio-Pliocene Solimões Formation, from the borehole 1AS-34-AM drilled in the upper Jutaí River, Amazonas State, Brazil. We report four species, including Tryonia scalarioides scalarioides, Tryonia cf. T. nuttalli, besides of a new species and other kept in open nomenclature”.
The new species described is Tryonia globosa and the holotype is in the Paleontological Section of the Museu Paraense Emílio Goeldi (MPEG 2357-I/1).
de Almeida Guimaraes, L.I. et al., 2018. New records of Tryonia (Gastropoda, Cochliopidae) from the Mio-Pliocene Solimoes Formation (State of Amazonas), Brazil. – Revista Brasileira de Paleontologia, 21 (3):255-264