Insects are which first appeared about 380 mya. Insects are different from the other arthropods because they have only three pairs of legs and most insects have wings. Also, unlike most other arthropods, the insectís body is divided into three regions: the head, the thorax, and the abdomen.
Insects form the largest class of the arthropods, which is itself the largest animal phylum or tribe. Of all the animal species so far discovered, insects make up about five-sixths. As well as the roughly one million insect species known, there may be one to four million yet to be discovered.
Insects are divided into
Apterygota - primitive and wingless
Thysanura - bristletails, silverfish
Pterygota - more advanced winged or secondarily wingless
Coleoptera - beetles and weevils
Diptera - flies, midges, gnats,
Ephemeroptera - mosquito, mayflies
Heteroptera - bugs
Homoptera - aphids, leafhoppers, and cicadas
Hymenoptera - bees, wasps, and ants
Isoptera - termites
Lepidoptera - butterflies and moths
Neuroptera - lacewings
Odonata - dragonflies and damselflies
Orthoptera - grasshoppers, locusts, crickets, and katydids
Siphonaptera - fleas
Thysanoptera - thrips
Trichoptera - caddis flies
Another planet started to form but broke up into pieces because of the gravity of . It formed a ring of small rocks where the planet should have been. We call them the .
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