• Iothia Forbes, 1849
• Nothia Pflaumann, 1964 †
• Richia Coker, 1926 accepted as Etheostoma Rafinesque, 1819
• Rochia Gray, 1857
• Rochia Munari, 1975 accepted as Lyrodus Gould, 1870
• Rotalia Lamarck, 1804 †
• Rotaria Scopoli, 1777
• Rothee accepted as Rohtee Sykes, 1839
• Rothia
• Rothia Lam. accepted as Hymenopappus L'Hér.
• Rothia Schreb. accepted as Andryala L.
• Rothina Hanzlíková, 1966 † accepted as Caudammina Montanaro Gallitelli, 1955 †
• Rothium Moore & Legner, 1977
• Rotula Albers, 1850 accepted as Harmogenanina Germain, 1918
• Rotula Schumacher, 1817
• Rotuma Springer, 1988
• Ruthia Shasky, 1970