| Both genera are likely monotypic, though some scholars have argued that Brachycephalus includes two previously synonymized species. |
| Loss of structure in monotypic litter likely led to reduced and less hospitable physical living space. |
| Until more material from critical areas is available for study, I continue to recognize angustapalata as a monotypic species. |
| Most of the species not studied are monotypic and have restricted geographic ranges. |
| I follow Burt and Stirton in treating Diphylla ecaudata as a monotypic species. |
| These genera can be considered monotypic, although Ceratodrilus does have two described species which would be considered subspecies if that rank were being used. |
