| Achnanthidiaceae D.G. Mann, 1990 |
| Achnanthidium Kütz., 1844 |
| Achnanthidium affine (Grunow) Czarn., 1994 |
| Achnanthidium biasolettianum (Grunow) Round & Bukhtiyarova, 1996 |
| Achnanthidium coarctatum Bréb. ex W. Sm., 1855 |
| Achnanthidium exiguum (Grunow) Czarn., 1994 |
| Achnanthidium exile (Kütz.) Heib., 1863 |
| Achnanthidium lanceolatum Bréb., 1846 |
| Achnanthidium minutissimum (Kütz.) Czarn. 1994 |
| Achnanthidium pyrenaicum (Hust.) H. Kobayasi, 1997 |
| Achnanthidium thermale Rabenh., 1864 |
| Achnanthidium woltereckii (Hustedt) Lange-Bert., 1999 |
| Astartiella (Grunow) Witkowski, Lange-Bert. & Metzeltin, 1998 |
| Astartiella punctifera (Hust.) Witkowski & Lange-Bert., 1998 |
| Karayevia Round & L. Bukhtiyarova ex Round, 1998 |
| Karayevia clevei (Grunow) Round & Bukhtiyarova, 1996 |
| Lemnicola Round & Basson, 1997 |
| Lemnicola hungarica (Grunow) Round & Basson, 1997 |
| Planothidium Round & L. Bukhtiyarova, 1996 |
| Planothidium chilense (Hust.) Lange-Bert., 1927 |