Navicula directa W.Sm. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Chromista phylum Ochrophyta class Bacillariophyceae order Naviculales family Naviculaceae genus Navicula species Navicula directa Name Homonyms Navicula directa (W.Smith) Ralfs Navicula directa (W.Smith) Brébisson