Mayflies of the United States
Mayflies of Clay County, Iowa
Species denoted with an asterisk (*) are unconfirmed or dubious records.
Ephemeridae
No Common Name -- (Hexagenia limbata) No Common Name -- (Pentagenia vittigera)
Heptageniidae
No Common Name -- (Stenonema terminatum terminatum)
Isonychiidae
No Common Name -- (Isonychia rufa)
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