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Noun1.Ephemerida - mayflies
animal order - the order of animals
class Hexapoda, class Insecta, Hexapoda, Insecta - insects; about five-sixths of all known animal species
ephemerid, ephemeropteran - short-lived insect
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References in periodicals archive ?
1935.--Two new genera of North American Heptageniidae (Ephemerida).
The percentages of insect orders among the wings were Coleoptera 36.1, Hymenoptera 26.3, Diptera 13.2, Plecoptera 6.5, Ephemerida 4.6, Hemiptera 3.4, Trichoptera 3.2, Neuroptera 3.2, Mecoptera 2.7 and Orthoptera 0.6.