Synedra affinis var. arcus (Kütz.) Grunow, 1881 Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Chromista phylum Ochrophyta class Bacillariophyceae order Fragilariales family Fragilariaceae genus Fragilaria species Fragilaria acus Name Homonyms Synedra affinis var. arcus (Kütz.) Grunow, 1881 Synedra affinis f. arcus (Kützing) Grunow, 1881