Ceratium horridum subsp. claviger (Kofoid) Sournia, 1968 Dataset GBIF Backbone Taxonomy Rank SUBSPECIES Classification kingdom Chromista phylum Myzozoa class Dinophyceae order Gonyaulacales family Ceratiaceae genus Tripos species Tripos horridus Name Homonyms Ceratium horridum f. claviger (Kof.) Sournia, 1968 Ceratium horridum subsp. claviger (Kofoid) Sournia, 1968