Meridion circulare var. constricta (Ralfs) Van Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Chromista phylum Ochrophyta class Bacillariophyceae order Fragilariales family Fragilariaceae genus Meridion species Meridion circulare Name Homonyms Meridion circulare f. constricta (Ralfs) Cleve-Euler, 1932 Meridion circulare f. constricta (Ralfs) Van Heurck, 1881