| Terrapene nelsoni subsp. klauberi Bogert, 1943 |
| Terrapene nelsoni subsp. nelsoni Stejneger, 1925 |
| Terrapene ornata (Agassiz, 1857) |
| Terrapene ornata subsp. luteola Smith & Ramsey, 1952 |
| Terrapene ornata subsp. ornata (Agassiz, 1857) |
| Terrapene triporcata Wiegmann, 1828 |
| Terrapene yucatana (Boulenger, 1895) |
| Toxaspis Cope, 1895 |
| Trachemys Agassiz, 1857 |
| Trachemys elegans (Wied, 1839) |
| Trachemys gaigeae (Hartweg, 1939) |
| Trachemys gaigeae subsp. gaigeae (Hartweg, 1939) |
| Trachemys gaigeae subsp. hartwegi (Legler, 1990) |
| Trachemys grayi (Bocourt, 1868) |
| Trachemys hartwegi (Legler, 1990) |
| Trachemys lineata Gray, 1873 |
| Trachemys nebulosa (Van Denburgh, 1895) |
| Trachemys nebulosa subsp. hiltoni Carr, 1942 |
| Trachemys nebulosa subsp. nebulosa (Van Denburgh, 1895) |
| Trachemys ornata (Gray, 1831) |