Gomphonema angustatum var. productum Grunow Dataset Rank VARIETY Classification kingdom Chromista phylum Ochrophyta class Bacillariophyceae order Cymbellales family Gomphonemataceae genus Gomphonema species Gomphonema productum Name Homonyms Gomphonema angustatum var. productum Grunow, 1880 Gomphonema angustatum f. productum (Grunow) Mayer, 1939