Synedra ulna var. longissima (W.Sm.) Brun Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Chromista phylum Ochrophyta class Bacillariophyceae order Fragilariales family Fragilariaceae genus Synedra species Synedra biceps Name Homonyms Synedra ulna var. longissima (W.Sm.) Brun, 1880 Synedra ulna f. longissima (W.Smith) Abshagen, 1908 Synedra ulna var. longissima Grunow, 1884