Cosmarium oblongum A.W.Benn. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Cosmarium species Cosmarium oblongum Name Synonyms Calocylindrus oblongus (Bennett) Cooke Dysphinctium oblongum Bennett Homonyms Cosmarium oblongum A.W.Benn.