Comparative material, Carychium mexicanum Pilsbry, 1891 (AJC 2092) from Puebla, Mexico A, C, E, G, I, K and topotypic C. costaricanum E. von Martens, 1898 (AJC 2093) B, D, F, H, J, L; A–LCT scans showing columellar apparatus and configuration of the columellar lamella in both species A–L. 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.