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      Insects (from Latin insectum, a calque of Greek ἔντομον [éntomon], "cut into sections") are a class of living creatures within the arthropods that have a chitinous exoskeleton, a three-part body (head, thorax, and abdomen), three pairs of jointed legs, compound eyes, and two antennae. They are among the most diverse groups of animals on the planet, including more than a million described species and represent more than half of all known living organisms. The number of extant species is estimated at between six and ten million, and potentially represent over 90% of the differing metazoan life forms on Earth.Insects may be found in nearly all environments, although only a small number of species occur in the oceans, a habitat dominated by another arthropod group, the crustaceans.

Source: http://en.wikipedia.org/wiki/Insecta

A phyllogeny of Insects
Source: http://www.windsofkansas.com/InsectaPhylogeny.html
Adephaga PB477
Adephagafoto PB452
Archimylacridae p5074
Ephemeropsis PB443
Ephemeropsis trisetalis PB446
Ephemeropsis trisetalisfoto PB444
Ephemeropsis trisetalisfoto PB445
Ephemeropsis trisetalisfoto PB442
Insecta Linnaeus, 1758 XB815
Insecta Linnaeus, 1758 p2643
Insecta Linnaeus, 1758 p4895
Opsiomylacris ZŠ692

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]