Comparative material, Carychium mexicanum Pilsbry, 1891 (RBINS 10591) (ex. Autor) S. N. & M. C. Rhoads Expedition, “Texolo Falls V. Cruz, Mexico Rhoads legit”. A–E with Bynes degradation; Carychium costaricanum E. von Martens, 1898 (RBINS 10591) original type series F–I; F peristome thickly callused showing apertural barriers. Scale bar 1 mm.

  Part of: Jochum A, Weigand AM, Bochud E, Inäbnit T, Dörge DD, Ruthensteiner B, Favre A, Martels G, Kampschulte M (2017) Three new species of Carychium O.F. Müller, 1773 from the Southeastern USA, Belize and Panama are described using computer tomography (CT) (Eupulmonata, Ellobioidea, Carychiidae). ZooKeys 675: 97-127.