Insects are the most diverse group of animals on Earth. There are over a million described species of insect, and an estimated 6-10 million species total. Insects are found in nearly every above-ground environment, even in Antarctica, which has a species of insect called springtails. There is even a species of insect that lives on the surface of the open ocean, walking on the water tension using tiny leg hairs. These are insects of the genus Halobates, otherwise known as sea skaters or water striders. Around Antarctica, where there is greater oxygen in the sea than the Equator, these can grow to 30 cm (1 ft) in width.
So far, there have been observations of 5,000 dragonfly species, 2,000
praying mantis, 20,000 grasshopper, 170,000 butterfly and
moth, 120,000 fly, 82,000 true bug, 360,000 beetle, and 110,000 bee, wasp and ant species. Keep in mind that
arachnids, such as
mites — of which there are over 1 million described species — and
crustaceans, like lobsters, are not insects, which only includes members of the class Insecta.
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