the root (no rank)
Eukaryota (domain)
Alveolata (kingdom)
Dinophyceae (class)
Peridiniales (order)
Gonyaulacaceae (family)
Alexandrium (genus)
[hide inferior taxa]
Alexandrium affine (species)
Alexandrium catenella (species)
Alexandrium fundyense (species)
Alexandrium tamarense (species)