| Name | From | To | Age range |
|---|---|---|---|
| Alexandrium | Nd | Nd |
|
| Alexandrium affine | Nd | Nd |
|
| Alexandrium andersonii | Nd | Nd |
|
| Alexandrium catenella | Recent | Recent |
|
| Alexandrium cohorticula | Nd | Nd |
|
| Alexandrium compressum | Nd | Nd |
|
| Alexandrium concave | Nd | Nd |
|
| Alexandrium concavum | Nd | Nd |
|
| Alexandrium excavatum | Recent | Recent |
|
| Alexandrium fundyense | Nd | Nd |
|
| Alexandrium hiranoi | Nd | Nd |
|
| Alexandrium leei | Nd | Nd |
|
| Alexandrium lusitanicum | Nd | Nd |
|
| Alexandrium margalefii | Nd | Nd |
|
| Alexandrium minutum | Nd | Nd |
|
| Alexandrium monilatum | Nd | Nd |
|
| Alexandrium ostenfeldii | Recent | Recent |
|