Staurastrum longispinum var. bidentatum (Wittr.) W. & G.S.West Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Staurastrum species Staurastrum longispinum Name Homonyms Staurastrum longispinum var. bidentatum (Wittr.) W. & G.S.West Staurastrum longispinum var. bidentatum (Wittrock) Cushman, 1905