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Abstract
In order to establish the correct name for a small centric diatom which is very common in the Baltic Sea, we investigated original material of Cyclotella caspia Grunow and C. striata var. baltica Grunow from the Grunow Collection, as well as “Coscinodiscus striatus Kütz.” from the Rabenhorst exsiccata. We also compared our specimens from the Baltic Sea with figures and descriptions in the literature of C. caspia Grunow, C. caspia var. affinis Proschkina-Lavrenko & Makarova, C. choctawhatcheeana Prasad, C. hakanssoniae Wendker, C. tuberculata Makarova & Loginova, and C. litoralis Lange & Syvertsen. We show that C. caspia, C. litoralis, and C. striata var. baltica are species in their own right. The inter-relation of C. caspia var. affinis, C. affinis and C. tuberculoid are discussed. It is shown that C. choctawhatcheeana and C. hakanssoniae are conspecific and that for priority reasons the name C. choctawhatcheeana has to be used until further investigation of the species in the C. striata-complex has been completed.
