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Segment ten bears a pair of cerci, a pair of anal styles, the anus and the external genitalia.

About 30 cockroach species out of 4,600 are associated with human habitats. The cockroaches are an ancient group, dating back at least as far as the Carboniferous period, some 320 million years ago.As the body, hind wings and mouthparts are not preserved in fossils frequently, the relationship of these roachoids and modern cockroaches remains disputed.The first fossils of modern cockroaches with internal ovipositors appeared in the early Cretaceous.They are common and hardy insects, and can tolerate a wide range of environments from Arctic cold to tropical heat.Tropical cockroaches are often much bigger than temperate species, and, contrary to popular belief, extinct cockroach relatives and 'roachoids' such as the Carboniferous Archimylacris and the Permian Apthoroblattina were not as large as the biggest modern species.

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