Sphaerozosma pygmaeum (W.Archer) Rabenh., 1968 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Cosmarium species Cosmarium pygmaeum Name Homonyms Sphaerozosma pygmaeum (W.Archer) Rabenh., 1968