Mecópteros: Diferenzas entre revisións
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== Evolución ==
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[[DNA]] evidence indicates that the [[flea]]s, traditionally a separate order ([[Siphonaptera]]), are instead highly specialized scorpionflies.<ref>{{cite journal |last1=Whiting |first1=Michael F. |year=2002 |title=Mecoptera is paraphyletic: multiple genes and phylogeny of Mecoptera and Siphonaptera |journal=Zoologica Scripta |volume=31 |issue=1 |pages=93–104 |url=http://www3.interscience.wiley.com/journal/118916123/abstract |doi=10.1046/j.0300-3256.2001.00095.x }}</ref> The [[Boreidae]] are the sister clade to the Siphonaptera, so "Mecoptera" is paraphyletic, but there is a clade that contains both Mecoptera and Siphonaptera, with about 3000 known species.<ref name=WiegmannYates2012>{{cite book |last1=Wiegmann |first1=Brian |last2=Yeates |first2=David K. |title=The Evolutionary Biology of Flies |url=https://books.google.com/books?id=rElP5sNn6IYC&pg=PA5 |year=2012 |publisher=Columbia University Press |isbn=978-0-231-50170-5 |page=5 |quote=Recently, a close affinity between Siphonaptera and Mecoptera has been convincingly demonstrated via morphology (Bilinski et al. 1998) and molecular data (Whiting 2002), rendering Mecoptera paraphyletic, but making the clade including Mecoptera and Siphonaptera monophyletic... there is a general consensus among entomologists that the relationships described above are relatively well established.}}</ref> Two [[synapomorphy|synapomorphies]] are the production of [[resilin]], a very flexible and springy type of cuticle, and a reversion to [[panoistic ovariole]]s.▼
▲As análises de [[
Os mecópteros teñen especial importancia na evolución dos Insecta. Dúas das máis importantes ordes de insectos, [[Lepidoptera]] e [[Diptera]], xunto con [[Trichoptera]], probablemente evolucionaron a partir de antepasados que pertencían (ou estaban estritamente relacionados) aos Mecoptera. Isto faise evidente polas semellanzas anatómicas e bioquímicas, pero, ademais, descubríronse [[fósil transicional|fósiles transicionales]], como ''[[Permotanyderus]]'' e ''[[Choristotanyderus]]'', que se encontran a medio camiño entre os Mecoptera e os Diptera.<ref name=IIBD/>
O grupo estaba antes moito máis estendido e diversificdado que na actualidade, e tiñan catro subordes durante o [[Mesozoico]].<ref name=IIBD/>
== Primeiros polinizadores ==▼
[[File:Miriholcorpa A.png|thumb|right|''[[Miriholcorpa|Miriholcorpa forcipata]]'' holotype, a [[Middle Jurassic]] scorpionfly]]▼
▲== Primeiros polinizadores ==
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Extinct Mecoptera species have been proposed to have been important plant pollinators.<ref name="Ollerton"/><ref name="Ren"/> Early nonangiosperm [[gymnosperm]] seed plants during the late Middle Jurassic to mid–Early Cretaceous period have been believed to be mainly wind-pollinated. However, examination of fossil mecopterans show they had siphon feeding apparatus that could fertilize early gymnosperms by feeding on their [[nectar]] and [[pollen]]. The lack of iron enrichment in their fossilized [[proboscis|probosces]] rules out a use in blood drinking. One question over this suggestion is that so far pollen has not been found associated with these feeding parts, which is surprising for the amber-encased insects which should have preserved pollen, but "further fossils may provide this information".<ref name="Ollerton"/>
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