Abstract
Three new generic names are proposed for marine dinoflagellates. Herdmania gen. nov. is suggested for some organisms currently placed in Gymnodinium, and Sclerodinium gen. nov. for Gyrodinium calyptroglyphe and an entirely new species, S. striatum. In all cases the organisms cannot remain in the original genera because they are not naked but have a tough theca or periplast. Triadinium gen. nov. is proposed to replace Goniodoma Stein and Heteraulacus Diesing, both of which are invalid names. New combinations are put forward for several other species of Triadinium.

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