| algeria | | navicula cryptocephala var. veneta | varietas | 5 | 0 |
| china | | navicula cryptocephala | species | 1 | 0 |
| china | | navicula cryptocephala var. veneta | varietas | 1 | 0 |
| germany | | navicula cryptocephala | species | 6 | 0 |
| germany | | navicula cryptocephala var. veneta | varietas | 3 | 0 |
| germany | lower saxony | navicula cryptocephala | species | 2 | 0 |
| germany | lower saxony | navicula cryptocephala var. veneta | varietas | 3 | 0 |
| hungary | | navicula cryptocephala var. veneta | varietas | 1 | 0 |
| india | | navicula cryptocephala var. veneta | varietas | 1 | 0 |
| iran | | navicula cryptocephala var. veneta | varietas | 1 | 0 |
| iraq | | navicula cryptocephala var. veneta | varietas | 1 | 0 |
| mayotte | | navicula cryptocephala | species | 2 | 0 |
| united states | oklahoma | navicula cryptocephala | species | 4 | 0 |