| italy | emilia-romagna region | pseudo-nitzschia pseudodelicatissima | species | 1 | 0 |
| japan | | pseudo-nitzschia pseudodelicatissima | species | 1 | 0 |
| spain | | pseudo-nitzschia pseudodelicatissima | species | 1 | 0 |
| united states | washington | pseudo-nitzschia pseudodelicatissima | species | 29 | 0 |