Ceratium praelongum (Lemmermann) Kofoid Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Protozoa phylum Dinophyta class Dinophyceae order Peridiniales family Ceratiaceae genus Ceratium species Ceratium praelongum Name Homonyms Ceratium praelongum (Lemmerm.) Kof. Ceratium praelongum (Lemmerm.) Kof. ex Jörgensen, 1911