Ceratium arietinum f. gracilentum Jörg., 1920 Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Chromista phylum Myzozoa class Dinophyceae order Gonyaulacales family Ceratiaceae genus Tripos species Tripos arietinus Name Homonyms Ceratium arietinum f. gracilentum Jörg., 1920 Ceratium arietinum var. gracilentum (Jörg.) Sournia, 1966