Ephemeroptera


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Related to Ephemeroptera: Diptera, May fly, Trichoptera, shadfly

Ephemeroptera

[ə‚fem·ə′räp·tə·rə]
(invertebrate zoology)
The mayflies, an order of exopterygote insects in the subclass Pterygota.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Ephemeroptera

 

(mayflies), an order of winged insects having two similar winged phases, the subimago and imago, which are separated by a molt. During these phases, which have a duration ranging from several seconds to several days, the insects do not feed. Some species live for only one day.

The mouthparts are vestigial, and the alimentary canal has been transformed into an air bladder. The forewings have a rich network of venation and are larger than the hind wings. Sometimes hind wings are absent. The tip of the abdomen has three segmented filaments—a pair of long, lateral cerci and one median paracercus, which is sometimes much shorter than the other two.

The mayfly undergoes incomplete metamorphosis. It has a large number of larval stages (as many as 25), and development takes place in the water for one to three years.

There are 23 widely distributed families, embracing more than 2,000 species. The USSR has 17 families, with more than 200 species. Mayflies all inhabit freshwaters, but they represent various ecological groups and have adapted to various living conditions (undergrowth, mud, rapids, soil). The larvae are food for many valuable commercial fishes, including salmon and white-fish. Ephemeropteran fossils are important in stratigraphy.

REFERENCE

Opredelitel’ nasekomykh Evropeiskoi chasti SSSR, vol. 1, pages 110–36. Edited by G. Ia. Bei-Bienko. Moscow-Leningrad, 1964.

O. A. CHERNOVA

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
guineensis fed on macropthytes, molluscs, Coleoptera, mud, zooplankton, Hymenoptera, Trichoptera, Ephemeroptera, animal debris and sand.
Composition and diversity of Ephemeroptera (Insecta) nymph communities in the middle section of the Jacui River and some tributaries, southern Brazil.
Nanomis Prebaetodes 28 Baetidae 1 162 Baetidae 2 1 Ephemeroptera Haplohyphes 1 12 Leptohyphidae Haplohyphes 2 4 Leptohyphes 157 Farrodes 5 Hagenulopsis cf.
-- -- Blanchard Hirudinidae Hirudinaria -- 2.25 [+ or -] 5.36 granulosa (0-18) (Savigny) ARTHROPODA Insecta Ephemeroptera Baetis sp.
Site ID EPT (a) TR %OC %EPT NCBI %DOM %CLG (b) (c) (d) (e) (f) (g) 2 7 16 24.5 71.8 3.4 41.0 58.5 4 9 28 21.4 72.8 3.1 44.5 62.4 5 8 18 13.2 68.6 3.6 24.0 40.2 7 9 20 21.7 61.4 4.0 25.1 16.4 9 7 21 28.7 55.7 4.0 19.3 43.2 Mean 8.0 21.6 21.9 66.1 3.6 30.8 44.2 (a) Ephemeroptera, Plecoptera, and Trichoptera taxa.
When individual insect orders were compared, the Ephemeroptera (mayflies) and Diptera (true flies) made up the greatest percentages of insects in both BU+ and BU- site types (Figure 3; online Technical Appendix).
Para la temporada del mes de Julio (epoca seca), se observaron bajos valores en los parametros hidraulicos relacionado con altas densidades (en especial las poblaciones de Ephemeroptera, Oligochaeta, Plecoptera) e incremento del numero de taxa, sobre todo para los sitios inferiores.
Tambien cabe destacar la presencia de Ephemeroptera (organismos sensibles a contaminacion) en el sitio de referencia, lo que marco una diferencia importante con respecto a los sitios contaminados, ya que este taxon no se registro en ninguno de ellos.
% by % by Month N Prey item FOC number SE weight SE June 1 Chironomidae 100.0 6.7 6.7 4.3 4.3 Ephemeroptera 100.0 6.7 6.7 2.9 2.9 Amphipoda 100.0 86.7 86.7 92.8 92.8 August 5 Chironomidae 100.0 25.4 11.4 7.6 5.4 Zygoptera 40.0 9.0 6.7 3.0 2.6 Trichoptera 20.0 0.6 0.6 0.6 0.6 Ephemeroptera 80.0 7.4 3.9 3.4 2.8 Mollusca 20.0 2.8 2.8 6.6 6.6 Amphipoda 100.0 54.6 7.7 27.3 10.1 Cladocera 20.0 0.3 0.3 0.01 0.01 UR 100.0 .
10:20 A CHARACTERIZATION OF THE EPHEMEROPTERA, PLECOPTERA AND TRICHOPTERA FAUNA FROM HEADWATER STREAMS ON THE CAMP SHELBY TRAINING SITE IN SOUTH MISSISSIPPI
Surface sculpin stomachs contained an average of 76% fish including Percina and Notropis, and 16% invertebrates including Ephemeroptera, Trichoptera, Zygoptera and Gammaridae.