Nixe horrida (McDunnough, 1926) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Arthropoda class Insecta order Ephemeroptera family Heptageniidae genus Nixe species Nixe horrida Name Synonyms Ecdyonurus horridus (McDunnough, 1926) Heptagenia horrida McDunnough, 1926 Homonyms Nixe horrida (McDunnough, 1926)