[Redescription of Prorocentrum donghaiense Lu and comparison with relevant Prorocentrum species].

In this paper, the detailed morphology of Prorocentrum donghaiense was studied. Taxonomic comparison was made between P. donghaiense and other relevant Prorocentrum species. The results suggested that distinct differences existed among them with respect to their conservative characteristics of morphology and cell sizes. This kind of discrepancy was far beyond that of individual variations within same species due to environmental factors. Therefore, the high biomass bloom-forming species in the East China Sea was not real Prorocentrum "dentatum" Stein, but P. donghaiense Lu that was re-described in the present paper. P. donghaiense appeared in the East China Sea, and P. "dentatum" occurred in Japanese and Korean waters should be the same species.