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Ephemera danica can reach an imago size of 15–20 mm (0.6–0.8 in) in males, while females are larger, reaching 16–25 mm (0.6–1.0 in). This mayfly, with its characteristic markings and three tails (), is the most commonly seen of British Ephemeridae.
Ephemera annandalei; Ephemera blanda; Ephemera brunnea; Ephemera compar; Ephemera consors; Ephemera danica; Ephemera diffusa; Ephemera distincta; Ephemera duporti
The mayfly Ephemera danica A piece of ephemera circa 1749–1751, around the time Samuel Johnson may have coined the term. The etymological origin of Ephemera (ἐφήμερα) is the Greek epi (ἐπί) – "on, for" and hemera (ἡμέρα) – "day".
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Ephemerids are generally quite large mayflies (up to 35 mm) with either two or three very long tails. Many species have distinctively patterned wings. [2] They breed in a wide range of waters, usually requiring a layer of silt as the nymphs have strong legs which are adapted for burrowing (the group is sometimes known as burrowing mayflies).
Ephemera compar is known from a single specimen, collected from the "foothills of Colorado" in 1873, but despite intensive surveys of the Colorado mayflies reported in 1984, it has not been rediscovered.
A. Acanthametropodidae; Acanthametropus pecatonica; Acanthomola; Acentrella; Acentrella almohades; Acentrella barbarae; Acentrella charadra; Acentrella glareosa
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