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Family Ephemerellidae - Spiny Crawler Mayflies

Spiny Crawler Nymph - Ephemerella subvaria Mayfly Species, one of three different species emerging on my back porch Ephemerella subvaria Ephemerella subvaria Eurylophella verisimilis Drunella pelosa Ephemerellidae?  - Teloganopsis deficiens Mayfly1 - Ephemerella - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Ephemeroptera (Mayflies)
Suborder Furcatergalia
Infraorder Pannota
Superfamily Ephemerelloidea
Family Ephemerellidae (Spiny Crawler Mayflies)
Numbers
75 spp. in 14 genera in our area(1), ~150 spp. in 22 genera total(2)
Range
Holarctic & Oriental, more diverse in NA(2)