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Insects

The most successful of the animals

Hymenopterans	True Flies	Caddis Flies	Butterflies and Moths
Fleas	Scorpionflies	Stylops	Beetles
Lacewings	Thrips	True Bugs	Termites
Sucking Lice	Biting Lice	Book Lice	Terrestrial Lice
Mantids and Cockroaches	Embiids	Earwigs	Stick and Leaf Insects
Grasshoppers	Grylloblattas	Stoneflies	Dragonflies
Mayflies	Bristeltails	Springtails	Silverfish
Proturids

Class Insecta

The class Insecta is composed entirely of insects and is the largest group in the animal kingdom, with 29 orders and 800 000 known species. It is estimated that there may be up to 50 000 000 species of insects on Earth, most of which have not yet been discovered. Insects are in the phylum Arthropoda along with Malacostraca (crabs), Diplopoda (millipedes), Chilopoda (centipedes), and Arachnida (spiders, ticks). Insects are in the subphylum Tracheata because they breathe through a trachaea. All insects have a general appearance: a hard outer covering (exoskeleton) that is non-living and must be shed periodically; one pair of antannae (sometimes a second, smaller pair around the mouth); mouth parts perfected for licking, piercing, crushing, or sucking; 6 legs (3 pairs) all found on the thorax; and three body sections known as the head, the thorax, and the abdomen. Most insects have one or two pairs of wings.

Insects are the most successful forms of life on this planet. They are typically very small, the largest being about the size of a human hand. They locomote in a variety of ways, including swimming, jumping, gliding, flying, skating, clinging, floating, crawling, walking, running, and/or drifting. Class Insecta is one of the most diverse groups of animals on this planet. The 29 orders are:

Protura (small, wingless insects)
Collembola (springtails)
Thysanura (silverfish)
Diplura (bristletails)
Ephemeroptera (mayflies)
Odonata (dragonflies, damselflies)
Plecoptera (stoneflies)
Grylloblatodea (grylloblattas)
Orthoptera (crickets, grasshoppers, locusts)
Phasmida (stick insects, leaf insects)
Dermaptera (earwigs)
Embioptera (embiids)
Dictyoptera (cockroaches, mantids)
Isoptera (termites)
Zoraptera (terrestrial lice)
Psocoptera (book lice, bark lice)
Mallophaga (biting lice)
Siphunculata (sucking lice)
Hemiptera (true bugs)
Thysanoptera (thrips)
Neuroptera (lacewings, antlions, mantis flies)
Coleoptera (beetles) 300 000 spp
Strepsiptera (stylops)
Mecoptera (scorpionflies)
Siphonaptera (fleas)
Diptera (true flies, mosquitoes)
Lepidoptera (butterflies, moths) 200 000 spp
Trichoptera (caddis flies)
Hymenoptera (bees, ants, wasps, hornets) 100 000 spp

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