Nitzschia sigma var. clausii Hantzsch, 1860 Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Chromista phylum Ochrophyta class Bacillariophyceae order Bacillariales family Bacillariaceae genus Nitzschia species Nitzschia clausii Name Homonyms Nitzschia sigma var. clausii Hantzsch, 1860 Nitzschia sigma var. clausii (Hantzsch) Grunow Nitzschia sigma f. clausii (Hantzsch) Grunow, 1878