
1) Ephemerid 2) Ephemeropteran 3) Insect with a short lifespan 4) Mayfly 5) Shadfly
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https://www.crosswordclues.com/clue/dayfly

1) Mayfly 2) Shadfly
Found on
https://www.crosswordclues.com/clue/dayfly

• (n.) 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.
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http://thinkexist.com/dictionary/meaning/dayfly/
Day'fly` (dā'flī`)
noun (Zoology) 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
Ephemer...Found on
http://www.encyclo.co.uk/webster/D/9

Dayfly is the popular name of those neuropterous insects which belong to the genua Ephemera. They are so called because, though they may exist in the larval and pupal state for several years, in their perfect form they exist only from a few hours to a few days, taking no food, but only propagating their species and then dying.
Found on
http://www.probertencyclopaedia.com/browse/BD.HTM
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