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Ephemeroptera was defined by Alpheus Hyatt and Jennie Maria Arms Sheldon in 1890–1. [44] [45] The taxonomy of the Ephemeroptera was reworked by George F. Edmunds and Jay R Traver, starting in 1954. [46] [47] Traver contributed to the 1935 work The Biology of Mayflies, [48] and has been called "the first Ephemeroptera specialist in North ...
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The group is sometimes referred to as flat-headed mayflies or stream mayflies.These are generally rather small mayflies with three long tails. The wings are usually clear with prominent venation although species with variegated wings are known.
Trudgil (1989) Soil types: a field identification guide; Friday (1988) A key to the adults of British Water Beetles (freely downloadable pdf from ) Haslam et al. (1987) British water plants (revised edition) Tilling (1987) A key to the major groups of terrestrial invertebrates; Hiscock (1986) A field guide to the British Red Seaweeds (Rhodophyta)
Nesameletidae is a family of mayflies in the order Ephemeroptera. There are at least three genera and about eight described species in Nesameletidae. There are at least three genera and about eight described species in Nesameletidae.
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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.
Nymph. The mature adult stage of Hexagenia limbata can be as much as 27 cm (10.6 in) long. The females tend to be slightly larger than the males but have smaller eyes. The forewings are long and membranous while the hind wings are much smaller and have dark margins.