Onychogomphus nigrescens Pinhey, 1952 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Arthropoda class Insecta order Odonata family Gomphidae genus Onychogomphus species Onychogomphus styx Name Homonyms Onychogomphus nigrescens Laidlaw, 1902 Onychogomphus nigrescens Pinhey, 1952