Aphanocapsa elachista is a species of Cyanobacteria belonging to the family Merismopediaceae.

Synonyms: Microcystis pulverea f. elachista (West & G.S.West) Elenkin 1938 Microcystis elachista (West & G.S.West) Starmach 1966 Aphanocapsa elachista var. planctonica G.M.Smith 1920

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