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Family Oligoneuriidae - Brushleg Mayflies

Homoeoneuria homoeoneuria - Homoeoneuria Homoeoneuria exoskeleton
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Ephemeroptera (Mayflies)
Suborder Pisciforma
Superfamily Heptagenioidea
Family Oligoneuriidae (Brushleg Mayflies)
Numbers
9 spp. in 2 genera in North America, 54 spp. in 11 genera total(1)
Identification
Adults: forewing venation greatly reduced, with 3 or 4 longitudinal veins and few/no cross veins
Nymphs: femora and tibiae of forelegs with double row of long setae; gills on segment 1 ventral
Range
across the world; in NA, sw. & w. US (south into Mexico), through Midwest, to se. US
Habitat
Rivers, specific microhabitat varies with genus
Food
Nymphs are collector-filterers, gather food particles using foreleg setae