Morphological and phylogenetic data do not support the split of Alexandrium into four genera. - Mertens KN; Adachi M; Anderson DM; Band-Schmidt CJ; Bravo I; Brosnahan ML; Bolch CJS; Calado AJ; Carbonell-Moore MC; Chomérat N; Elbrächter M; Figueroa RI; et al. (Harmful algae, 2020)