Synedra ulna subsp. contracta Hsu, 1993 Dataset GBIF Backbone Taxonomy Rank SUBSPECIES Classification kingdom Chromista phylum Ochrophyta class Bacillariophyceae order Fragilariales family Fragilariaceae genus Synedra species Synedra ulna Name Homonyms Synedra ulna var. contracta Østrup, 1901 Synedra ulna f. contracta Hustedt, 1930 Synedra ulna subsp. contracta Hsu, 1993