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Cercus
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==Evolutionary origin== Like many insect body parts, including [[mandible (insect)|mandibles]], [[antenna (biology)|antennae]] and [[Stylet (anatomy)|stylet]]s, cerci are thought to have evolved from what were [[arthropod leg|legs]] on the primal insect form,<ref name= "isbn0-412-61390-5"/> a creature that may have resembled a [[velvet worm]], [[Symphyla]]n or a [[centipede]], worm-like with one pair of limbs for each [[Segmentation (biology)|segment]] behind the head or anterior [[Tagma (biology)|tagma]].<ref name="Grimaldi2005">{{cite book |last1=Grimaldi |first1=David |last2=Engel |first2=Michael S. |title=Evolution of the Insects |date=2005 |publisher=Cambridge University Press |isbn=978-0-521-82149-0 }}{{pn|date=June 2021}}</ref>
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