| Cosmioneis D.G. Mann & Stickle, 1990 |
| Cosmioneis brasiliana (Cleve) C.E. Wetzel & Ector, 2017 |
| Cosmioneis delawarensis (Grunow ex Cleve) D.G. Mann, 1990 |
| Cosmioneis pusilla (W. Sm.) D.G. Mann & Stickle, 1990 |
| Frustulia Rabenh., 1853 |
| Frustulia acuminata Kütz., 1833 |
| Frustulia adnata Kütz., 1833 |
| Frustulia aequalis Kütz., 1833 |
| Frustulia amosseana Lange-Bert., 2000 |
| Frustulia amphipleuroides (Grunow) Cleve-Euler, 1934 |
| Frustulia asymmetrica (Cleve) Hustedt, 1954 |
| Frustulia capitata C.L. Graeff & Kociolek, 2011 |
| Frustulia cassieae Lange-Bert. & T. Beier, 2007 |
| Frustulia coffeaeformis C. Agardh, 1827 |
| Frustulia copulata Kütz., 1833 |
| Frustulia crassinervia (Bréb.) Lange-Bert. & Krammer, 1996 |
| Frustulia creuzburgensis (Krasske) Hust., 1957 |
| Frustulia elliptica C. Agardh, 1824 |
| Frustulia erifuga Lange-Bert. & Krammer, 1996 |
| Frustulia interposita (F.W. Lewis) De Toni, 1891 |