Ceratium contortum var. karsteni (Pavill.) Sournia Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Chromista phylum Myzozoa class Dinophyceae order Gonyaulacales family Ceratiaceae genus Tripos species Tripos contortus Name Homonyms Ceratium contortum var. karsteni (Pavill.) Sournia