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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.
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 annandalei; Ephemera blanda; Ephemera brunnea; Ephemera compar; Ephemera consors; Ephemera danica; Ephemera diffusa; Ephemera distincta; Ephemera duporti
The theme of brief life is echoed in the artist Douglas Florian's 1998 poem, "The Mayfly". [78] The American Poet Laureate Richard Wilbur 's 2005 poem "Mayflies" includes the lines "I saw from unseen pools a mist of flies, In their quadrillions rise, And animate a ragged patch of glow, With sudden glittering".
The name Palaeoptera (from Greek παλαιός (palaiós 'old') + πτερόν (pterón 'wing')) has been traditionally applied to those ancestral groups of winged insects (most of them extinct) that lacked the ability to fold the wings back over the abdomen as characterizes the Neoptera.
Larval Commensal chironomids have been known to compete for space on the host. This competition happens on an interspecies level, but also with other commensal and or phoretic organisms. Chironomids have been reported to compete with ciliated protozoan Ephemera danica, although this competition has resulted in niche-partitioning on the hosts ...
Ephemera vulgata can be told in both adult and subimago stages from the rather similar green drake (Ephemera danica) by its duller colour and slightly smaller size.The wings are more heavily veined and the upper side of the abdomen has pairs of dark lateral markings on each segment.
In astronomy and celestial navigation, an ephemeris (/ ɪ ˈ f ɛ m ər ɪ s /; pl. ephemerides / ˌ ɛ f ə ˈ m ɛr ɪ ˌ d iː z /; from Latin ephemeris 'diary', from Ancient Greek ἐφημερίς (ephēmerís) 'diary, journal') [1] [2] [3] is a book with tables that gives the trajectory of naturally occurring astronomical objects and artificial satellites in the sky, i.e., the position ...