| Casiomys chapmani (Thomas, 1898) |
| Casiomys chapmani subsp. caudatus (Merriam, 1901) |
| Casiomys chapmani subsp. dilutior (Merriam, 1901) |
| Casiomys chapmani subsp. huastecae (Dalquest, 1951) |
| Casiomys guerrerensis (Goldman, 1915) |
| Casiomys melanotis (Thomas, 1893) |
| Casiomys melanotis subsp. colimensis (Goldman, 1918) |
| Casiomys melanotis subsp. melanotis (Thomas, 1893) |
| Casiomys rhabdops (Merriam, 1901) |
| Casiomys rhabdops subsp. angusticeps (Merriam, 1901) |
| Casiomys rostratus (Merriam, 1901) |
| Casiomys rostratus subsp. carrorum (Lawrence, 1947) |
| Casiomys rostratus subsp. megadon (Merriam, 1901) |
| Casiomys rostratus subsp. rostratus (Merriam, 1901) |
| Casiomys rostratus subsp. yucatanensis (Merriam, 1901) |
| Casiomys saturatior (Merriam, 1901) |
| Casiomys saturatior subsp. hylocetes (Merriam, 1901) |
| Casiomys saturatior subsp. saturatior (Merriam, 1901) |
| Cricetidae Fischer, 1817 |
| Fiber T. Cuesta, 1925 |