Gomphonema angustatum f. aequale Grunow Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Chromista phylum Ochrophyta class Bacillariophyceae order Cymbellales family Gomphonemataceae genus Gomphonema species Gomphonema angustatum Name Homonyms Gomphonema angustatum f. aequale Grunow Gomphonema angustatum var. aequale