Class Dinophyceae Pascher (1914)
   Order Peridiniales Haeckel (1894)
     Family Gonyaulacaceae Er. Lindem. (1928)
       Genus Alexandrium Halim (1960)
         861 Alexandrium acatenella (Whedon & Kofoid) E. Balech
         862 Alexandrium affine (H. Inoue & Y. Fukuyo) E. Balech
         863 Alexandrium andersonii Balech
         864 Alexandrium balechii (Steidinger) Balech
         865 Alexandrium camurascutulum MacKenzie & Todd (2002)
         866 Alexandrium catenella (Whedon & Kofoid) Balech
         867 Alexandrium cohorticula E. Balech
         868 Alexandrium compressum (Fukuyo, Yoshida & Inoue) Balech
         869 Alexandrium concavum (Gaarder) Balech
         870 Alexandrium depressum (Gaarder) Balech & Tangen (1985)
         871 Alexandrium foedum Balech
         872 Alexandrium fraterculus E. Balech
         873 Alexandrium fundyense E. Balech
         874 Alexandrium hiranoi Kita & Fukuyo (1988)
         875 Alexandrium insuetum Balech
         876 Alexandrium kutnerae (Balech) Balech
         877 Alexandrium leei Balech (1985)
         878 Alexandrium margalefii Balech
         879 Alexandrium minutum Halim
         880 Alexandrium monilatum (Howell) Balech (1985)
         881 Alexandrium ostenfeldii (Paulsen) Balech & Tangen
         882 Alexandrium peruvianum (Balech & Mendiola) Balech & Tangen (1985)
         883 Alexandrium pseudogoniaulax (Biecheler) Kita & Fukuyo (1992)
         884 Alexandrium satoanum K. Yuki & Y. Fukuyo
         885 Alexandrium tamarense (Lebour) Balech (1995)
         886 Alexandrium tamiyavanichii Balech (1994)
         887 Alexandrium taylorii Balech
         888 Alexandrium tropicale E. Balech