Placoneis gastrum (Ehrenberg) Mereschkovsky Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Bacillariophyta class Bacillariophyceae order Cymbellales family Cymbellaceae genus Placoneis species Placoneis gastrum Name Homonyms Placoneis gastrum (Ehrenb.) Mersechkowsky Placoneis gastrum (Ehrenberg) Mereschkovsky, 1903