Abstract
The type species of the genus Alexandrium. A. minutum Halim, has remained ill-defined and there has been an urgent need for its detailed redescription. Abundant material from the type-locality, determined by Halim, has been subjected to a thorough study, thus providing a good foundation for the genus Alexandrium and demonstrating that the genus Protogonyaulax Taylor is a synonym of Alexandrium. Alexandrium ibericum Balech is undoubtedly the same species.

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