| Torulopsis taboadae Ulloa & T. Herrera, 1978 |
| Trachysphenia Petit, 1877 |
| Trachysphenia acuminata Hust., 1955 |
| Tremiscus (Pers.) Lév., 1846 |
| Tremiscus helvelloides (DC.) Donk, 1958 |
| Tretospeira Piroz., 1972 |
| Tretospeira ugandensis (Hansf.) Piroz., 1972 |
| Triceratium Ehrenb., 1839 |
| Triceratium americanum Ralfs, 1861 |
| Triceratium antediluvianum (Ehrenb.) Grunow, 1867 |
| Triceratium antillarum Cleve, 1878 |
| Triceratium arcticum Brightw., 1853 |
| Triceratium broeckii Leud.-Fortm., 1879 |
| Triceratium bullosum O.N. Witt, 1873 |
| Triceratium campechianum Grunow, 1878 |
| Triceratium consimile Grunow, 1883 |
| Triceratium convexiusculum Grunow, 1890 |
| Triceratium dictyotum P.A. Sims & R. Ross, 1990 |
| Triceratium distinctum C. Janisch, 1885 |
| Triceratium dubium Brightw., 1859 |