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Superfamily Heptagenioidea

Mayfly - Maccaffertium - female Mayfly - Maccaffertium terminatum mayfly with pale blue eyes - Maccaffertium pulchellum - male Homoeoneuria From Missouri River in Elk Point, SD - Homoeoneuria alleni mayfly - Isonychia - male Mayfly - Leucrocuta Nymph 1 - Stenacron interpunctatum Mayfly? - Isonychia
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Ephemeroptera (Mayflies)
Suborder Pisciforma
Superfamily Heptagenioidea