| france | | pseudo-nitzschia australis | species | 2 | 0 |
| japan | | pseudo-nitzschia australis | species | 1 | 0 |
| namibia | | pseudo-nitzschia australis | species | 2 | 0 |
| new zealand | bay of plenty | pseudo-nitzschia australis | species | 1 | 0 |
| new zealand | marlborough | pseudo-nitzschia australis | species | 4 | 0 |
| new zealand | southland | pseudo-nitzschia australis | species | 2 | 0 |
| new zealand | tasman | pseudo-nitzschia australis | species | 5 | 0 |
| united kingdom | scotland | pseudo-nitzschia australis | species | 17 | 0 |
| united states | | pseudo-nitzschia australis | species | 2 | 0 |
| united states | california | pseudo-nitzschia australis | species | 6 | 0 |
| united states | washington | pseudo-nitzschia australis | species | 1 | 0 |