Acerpenna pygmaea (Hagen, 1861) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Arthropoda class Insecta order Ephemeroptera family Baetidae genus Acerpenna species Acerpenna pygmaea Name Synonyms Acerpenna harti (McDunnough, 1924) Baetis harti McDunnough, 1924 Baetis pygmaeus (Hagen, 1861) Baetis spiethi Berner, 1940 Cloe pygmaea Hagen, 1861 Homonyms Acerpenna pygmaea (Hagen, 1861)