karlodinium antarcticum karlodinium antarcticum karlodinium antarcticum is a species of unarmored dinoflagellates from the genus karlodinium. it was first isolated from the australian region of the southern ocean, near the polar front. it is medium-sized and is characterized by its long ovoid cell shape and rather long apical groove. it is considered potentially ichthyotoxic. karlodinium antarcticum scientific classification domain: eukaryota clade: diaphoretickes clade: sar clade: alveolata phylum: myzozoa superclass: dinoflagellata class: dinophyceae order: gymnodiniales family: kareniaceae genus: karlodinium species: k. antarcticum binomial name karlodinium antarcticumde salas