| Tepalcatia Thompson & Hershler, 2002 |
| Tepalcatia bakeri (Pilsbry, 1891) |
| Tepalcatia polia (Thompson & Hershler, 1991) |
| Tepalcatia tela Thompson & Hershler, 2002 |
| Texadina Abbott & Ladd, 1951 |
| Texadina sphinctostoma (Abbott & Ladd, 1951) |
| Tryonia Stimpson, 1865 |
| Tryonia allendae Hershler, Liu & Landye, 2011 |
| Tryonia angosturae Hershler, Liu & Landye, 2011 |
| Tryonia bakeria (Pilsbry, 1891) |
| Tryonia chuviscarae Hershler, Liu & Landye, 2011 |
| Tryonia contrerasi Hershler, Liu & Landye, 2011 |
| Tryonia dugesiana (Morrison, 1945) |
| Tryonia hertleini (Drake, 1956) |
| Tryonia julimesensis Hershler, Liu & Landye, 2011 |
| Tryonia mariae (Morrison, 1945) |
| Tryonia minckleyi Hershler, Liu & Landye, 2011 |
| Tryonia molinae Hershler, Liu & Landye, 2011 |
| Tryonia ovata Hershler, Liu & Landye, 2011 |
| Tryonia pasajae Hershler, Liu & Landye, 2011 |