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For Insects, Spiders & Their Kin
For the United States & Canada
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Species Cloeon dipterum

Cloeon dipterum - female Cloeon dipterum - male Mayfly - Cloeon dipterum - female Cloeon dipterum - female unknown mayfly - Cloeon dipterum Baetid imago - Cloeon dipterum - male Mayfly - Cloeon dipterum small minnow mayfly - Cloeon dipterum - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Ephemeroptera (Mayflies)
Suborder Pisciforma
Family Baetidae (Small Minnow Mayflies)
Genus Cloeon
Species dipterum (Cloeon dipterum)
Synonyms and other taxonomic changes
Cloeon dipterum (Linnaeus)
Orig. Comb: Ephemera diptera Linnaeus, 1761
Syn: Cloeon cognatum Stephens 1835
Range
Holarctic, widespread Eurasia; Canada & ne. US(1) Map(2)
Season
May-Sep (BG data)
Life Cycle
Ovoviviparous, meaning a mated female holds her eggs internally until embryonic development is complete (about 18 days), after which she lays them in water and they hatch almost immediately: Video - Video credit: David H. Funk, Stroud Water Research Center
Remarks
First recorded in the US in 1953, in Illinois; now widespread. Probably introduced.