Ptychogastria polaris Allman, 1878 Dataset NCBI Taxonomy Classification kingdom Metazoa phylum Cnidaria class Hydrozoa order Trachymedusae family Ptychogastriidae genus Ptychogastria species Ptychogastria polaris Name Homonyms Ptychogastria polaris Ptychogastria polaris Allman, 1878