Ptychogastria arctica (Haeckel, 1879) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Cnidaria class Hydrozoa order Trachymedusae family Ptychogastriidae genus Ptychogastria species Ptychogastria polaris Name Homonyms Ptychogastria arctica (Haeckel, 1879)