• Daschia Diller, 1970
• Laschia E.M. Fries, 1830 accepted as Campanella P.C. Hennings, 1895 [Family: Marasmiaceae]
• Laschia Junghuhn, 1838 accepted as Junghuhnia Corda, 1842 [Family: Meruliaceae]
• Tachia Aublet, 1775 [Family: Gentianaceae]
• Tachia Blanford, 1863 (unaccepted) [Family: Helicidae]
• Tachia Persoon, 1805 (unaccepted) [Family: Fabaceae]
• Tarachia Hübner, 1825 (uncertain) [Family: Lepidoptera (awaiting allocation)]
• Tarachia K.B. Presl, 1851 accepted as Asplenium Linnaeus, 1753 [Family: Aspleniaceae]
• Tarchia Maryanska, 1977 †
• Tasadia Müller in Janssen & Müller, 1984 † (uncertain)
• Tascia Walker, 1856
• Tascina Westwood, 1877
• Tascobia Ross, 1944 (uncertain)
• Tascuna (uncertain)
• Tasenia Snellen, 1901
• Tasimia Mosely, 1936
• Tasitia Moore, 1883 accepted as Danaus Kluk, 1780
• Tassia H. Sydow & P. Sydow, 1919
• Tasymia L.B. Golovneva, 2008 †
• Tauschia Haber, 1932 † [Family: Archaeogastropoda (awaiting allocation)]
• Tauschia Preissler, 1828 (unaccepted) [Family: Ericales (awaiting allocation)]
• Tauschia Schlechtendal, 1835 [Family: Apiaceae]
• Teschia C. Reid & E.M. Reid, 1915 † (uncertain) [Family: Anacardiaceae]
• Teschia Števčić, 2005 [Family: Brachyura incertae sedis]
• Teshia Edmunds, 1966 accepted as Okenia Menke, 1830
• Thascia Cameron, 1904 (uncertain)
• Thechia Pascoe, 1874
• Thochia Ayres, 1916 (unaccepted)
• Toschia Caporiacco, 1949 accepted as Callitrichia Fage, 1936
• Toshia Whitley, 1933 accepted as Dasyatis Rafinesque, 1810
• Trachia Martens, 1860 [Family: Camaenidae]
• Trachia Wright, 1855 † accepted as Thracia Leach in Sowerby, 1823 [Family: Thraciidae]
• Trichia De Haan, 1839 [Family: Xanthidae, Class: Malacostraca]
• Trichia Haller, 1768 [Family: Trichiaceae, Class: Myxomycetes]
• Trichia Hartmann, 1840 [Family: Hygromiidae, Class: Gastropoda]
• Trichia Hoffmann, 1790 (uncertain) [Family: , Class: Protozoa (awaiting allocation)]
• Trichia Hong, 1981 † accepted as Iyaiyai Evenhuis, 1994 † [Family: Chaoboridae, Class: Insecta]
• Trichia Nietner, 1861 (uncertain) [Family: Lepidoptera (awaiting allocation), Class: Insecta]
• Trichia Reuter, 1875 (uncertain) [Family: Miridae, Class: Insecta]
• Trochia Swainson, 1840