Cells are medium sized, usually longer than wide. The Po is bullet shaped. The first apical plate is directly connected to the Po and has a small ventral pore approximately half way between the anterior and posterior end of the plate. A. affine has a descending, excavated cingulum. The sulcus is also excavated and does not penetrate the epitheca.
- Balech (1985) The genus Alexandrium. Halim (Dinoflagellata). Cork, Sherkn Island Press
- C.J Band Schmidt, C.H Lechuga Devéze, D.M Kulis and D.M Anderson (2003). Culture Studies of Alexandrium affine (Dinophyceae), a Non-Toxic, Cyst Forming Dinoflagellate from Bahía Concepción, Gulf of California. Botanica Marina 46. 44-54.
- NL Nguyen & J Larsen (2004). Potentially toxic microalgae of Vietnamese waters : Gonyaulacales. Opera Botanica, Larsen J., Nguyen N.L. (eds), 140:73-117
- Tomas C ed. (1996) Identifying marine diatoms and dinoflagellates. pp 598. Academic Press Ltd. London
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