Gomphonema constrictum f. curta Mayer Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Chromista phylum Ochrophyta class Bacillariophyceae order Cymbellales family Gomphonemataceae genus Gomphonema species Gomphonema constrictum Name Homonyms Gomphonema constrictum f. curta Mayer Gomphonema constrictum f. curta Grunow, 1880 Gomphonema constrictum var. curta (Van Heurck) Zimmermann, 1911