| Scientific Name | TSN | Taxon Author | Common Name | Name Source | Usage | Reason (ITIS) | Taxon Rank |
|---|
| Cymatosira laevis | 621012 | Heiden in Heiden and Kolbe | | ITIS | not accepted | synonym of Synedropsis laevis | Species |
| Nitzschia aciculariformis | 621013 | Manguin | | ITIS | not accepted | synonym of Synedropsis laevis | Species |
| Synedra fragilis | 621016 | Manguin | | ITIS | not accepted | synonym of Synedropsis fragilis | Species |
| Synedra hyperborea | 3081 | Grunow | | ITIS | not accepted | synonym of Synedropsis hyperborea | Species |
| Synedra hyperborea var. flexuosa | 621017 | Grunow | | ITIS | not accepted | synonym of Synedropsis hyperborea | Variety |
| Synedra hyperborea var. hyperborea | 3082 | Grunow | | ITIS | not accepted | synonym of Synedropsis hyperborea | Variety |
| Synedra hyperborea var. rostellata | 3083 | Grunow | | ITIS | not accepted | synonym of Synedropsis hyperborea | Variety |
| Synedropsis fragilis | 621015 | (Manguin) Hasle, Medlin and Syvertsen | | ITIS | accepted | | Species |
| Synedropsis hyperborea | 621008 | (Grunow) Hasle, Medlin and Syvertsen | | ITIS | accepted | | Species |
| Synedropsis hyperboroides | 621009 | Hasle, Medlin and Syvertsen | | ITIS | accepted | | Species |
| Synedropsis laevis | 621011 | (Heiden in Heiden and Kolbe) Hasle, Medlin and Syvertsen | | ITIS | accepted | | Species |
| Synedropsis lata | 621014 | Hasle, Medlin and Syvertsen | | ITIS | accepted | | Species |
| Synedropsis recta | 621010 | Hasle, Medlin and Syvertsen | | ITIS | accepted | | Species |
