23 Oct mayfly wasp
 The nymphs can also serve as intermediate hosts for the horsehair worm Paragordius varius, which causes its definitive host, a grasshopper, to jump into water and drown. Un utile elemento di classificazione sono le appendici caudali, che spesso si mantengono costanti nell'àmbito dello stesso genere o specie. A large number of these species have common names among fly fishermen, who need to develop a substantial knowledge of mayfly "habitat, distribution, seasonality, morphology and behavior" in order to match precisely the look and movements of the insects that the local trout are expecting. The subimago stage does not survive for long, rarely for more than 24 hours.
Bisognerà però tener presente che i cerci sono molto fragili, e quindi naturalmente soggetti a spezzarsi anche in natura: in questo caso la frattura sarà riconoscibile dalla presenza di un piccolo moncherino. Altra caratteristica è la presenza di due cerci filamentosi posti al termine del corpo, a volte accompagnati da un terzo filamento mediano. Gli esemplari di Povilla adusta, nei pressi dei laghi africani, tendono a completare la fase finale adulta secondo i ritmi del ciclo lunare.  The greatest generic diversity is found in the Neotropical realm, while the Holarctic has a smaller number of genera but a high degree of speciation. Sono cattivi volatori a causa delle ali posteriori molto ridotte (a volte possono addirittura mancare), con un conseguente sviluppo del mesotorace. Mayflies, and other riverflies, help ensure that our rivers, lakes and streams are home to a rich variety of wildlife.
http://www.ephemeroptera.pwp.blueyonder.co.uk/, https://web.archive.org/web/20060424043152/http://www.cals.ncsu.edu/course/ent425/compendium/mayfly.html, http://www.earthlife.net/insects/ephemer.html, http://www.ucmp.berkeley.edu/arthropoda/uniramia/ephemeroptera.html, https://web.archive.org/web/20060408063318/http://ohioline.osu.edu/hyg-fact/2000/2166.html, https://it.wikipedia.org/w/index.php?title=Ephemeroptera&oldid=115056002, Template Webarchive - collegamenti all'Internet Archive, Voci non biografiche con codici di controllo di autorità, licenza Creative Commons Attribuzione-Condividi allo stesso modo. The action of filter feeding has a small impact on water purification but an even larger impact on the convergence of small particulate matter into matter of a more complex form that goes on to benefit consumers later in the food chain. , Two vessels of the Royal Navy were named HMS Mayfly: a torpedo boat launched in January 1907, and a Fly-class river gunboat constructed in sections at Yarrow in 1915. La brevità della vita degli adulti è compensata da un lungo processo di sviluppo larvale. Registered charity no. The major pollutants thought to be responsible are fine sediment and phosphate from agriculture and sewage.  The March brown is "probably the most famous of all British mayflies", having been copied by anglers to catch trout for over 500 years. La maggior parte degli Ephemeroptera possiede tre appendici caudali, anche se nella rispettiva forma adulta ne possono manifestare un numero diverso.  Fish that feed on mayfly nymphs that have bioaccumulated heavy metals are themselves at risk. They recovered the Baetidae as sister to the other clades. Their immature stages are aquatic fresh water forms (called "naiads" or "nymphs"), whose presence indicates a clean, unpolluted environment. Copulation may last just a few seconds, but occasionally a pair remains in tandem and flutters to the ground. Guida degli insetti d'Europa; di Michael Chinery, Franco Muzzio editore, ed 1998, ISBN 88-7413-025-2  In other species, the nymph rises to the surface, bursts out of its skin, remains quiescent for a minute or two resting on the exuviae (cast skin) and then flies upwards, and in some, the nymph climbs out of the water before transforming. The legs are robust and often clad in bristles, hairs or spines. , The Ancient Greek biologist and philosopher Aristotle wrote in his History of Animals that, Bloodless and many footed animals, whether furnished with wings or feet, move with more than four points of motion; as, for instance, the dayfly (ephemeron) moves with four feet and four wings: and, I may observe in passing, this creature is exceptional not only in regard to the duration of its existence, whence it receives its name, but also because though a quadruped it has wings also.[b]. , The nymph is the dominant life history stage of the mayfly.
Non a caso in greco ephemeros significa "che vive un giorno".  Once burrowing to the bottom of the lake, mayfly nymphs begin to billow their respiratory gills. In Europa sono presenti 14 famiglie (su 19 distribuite in tutto il globo, eccetto che in Artide e in Antartide) suddivise in circa 200 specie, di cui 80 vivono in Italia. Alcune larve arrivano ad impiegare 2 anni per raggiungere la prima muta (Ephemera danica), anche se la media rimane quella di un anno. Some thirteen families are restricted to a single bioregion. Leptophlebiidae. In shoals the hours their constant numbers bring  Once they have emerged, large numbers are preyed on by birds, bats and by other insects, such as Rhamphomyia longicauda. Synchronous emergence is probably an adaptive strategy that reduces the individual's risk of being eaten. Negli Stati Uniti gli Ephemeroptera prendono il nome di Mayfly (pl. The first aircraft designed by a woman, Lillian Bland, was titled the Bland Mayfly. , The nymphs are eaten by a wide range of predators and form an important part of the aquatic food chain. Coloburiscidae Bibliografia. In alcune specie gli occhi (che in quest'ordine sono sempre composti) sono suddivisi in due parti, una superiore - con delle faccette più grandi, ed una inferiore - con delle faccette più piccole. To counteract this, females may fly upriver before depositing their eggs. Large trouts sucked them in as they lay struggling on the surface of the stream, unable to rise till their wings were dried ... Their motions are very peculiar, up and down for so many yards almost in a perpendicular line. Some hatches attract tourists. Euthyplociidae 4132695.  From an economic standpoint, mayflies also provide fisheries with an excellent diet for fish. The shoes were designed with a wing venation pattern like the mayfly and were also said to have a finite lifetime. The life and times of the mayfly on the Mississippi — all twenty-four hours of it. Tricorythidae, Sottordine Schistonota
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