| Stilestrongylus peromysci Falcón-Ordaz & Sanabria-Espinoza, 1999 |
| Tadaridanema Falcón-Ordaz, Guzmán-Cornejo, García-Prieto & Gardner, 2006 |
| Tadaridanema delicatus (Schwartz, 1927) Falcón-Ordaz, Guzmán-Cornejo, García-Prieto & Gardner, 2006 |
| Tapironema Durette-Desset, Chabaud & Sutton, 1997 |
| Tapironema coronatum Durette-Desset, Chabaud & Sutton, 1997 |
| Teporingonema Harris, 1985 |
| Teporingonema cerropeladoensis Harris, 1985 |
| Torrestrongylus Vigueras, 1935 |
| Torrestrongylus tetradorsalis Caspeta-Mandujano, Peralta-Rodríguez, Galindo-García & Jiménez-Ruiz, 2015 |
| Travassostrongylus Orloff, 1933 |
| Travassostrongylus orloffi Travassos, 1935 |
| Tricholeiperia Travassos, 1935 |
| Tricholeiperia carnegiensis Chitwood, B. G., 1938 |
| Tricholeiperia leiperi Travassos, 1935 |
| Tricholeiperia pearsei Chitwood, B. G., 1938 |
| Trichostrongylidae Leiper, 1908 |
| Trichostrongylinae Leiper, 1908 |
| Trichostrongylini Leiper, 1908 |
| Trichostrongylinii Leiper, 1908 |
| Trichostrongylus Looss, 1905 |