Dayfly vs. Mayfly

Dayflynoun

A mayfly.

Mayflynoun

Any of the many fragile insects of the order Ephemeroptera that develop in fresh water and live very briefly as winged adults.

Dayflynoun

A neuropterous insect of the genus Ephemera and related genera, of many species, and inhabiting fresh water in the larval state; the ephemeral fly; - so called because it commonly lives but one day in the winged or adult state. See Ephemeral fly, under Ephemeral.

Mayflynoun

slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days

Dayflynoun

slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days

Mayfly

Mayflies (also known as shadflies or fishflies in Canada and the upper Midwestern U.S.; also up-winged flies in the United Kingdom) are aquatic insects belonging to the order Ephemeroptera. This order is part of an ancient group of insects termed the Palaeoptera, which also contains dragonflies and damselflies.