Bugs, a slang for are animals without a back bone eg. spiders millipedes flies. They started to appear on land over 400 million years in the shape of dragon flies, cockroaches and scorpions. Some of these were quite large with scorpions being 1 meter long and dragonflies with a wingspan of over a meter wide.
Tysanaura
(Silver fish)
Odonata
Dragon flies,damselflies,etc
Orthoptera
(grasshoppers locousts, etc)
Coleptera
(beetles)
Lepidoptera,
(butterflies,moths)
Dipteria
(flies mosquitoes)
Siphonotera
(fleas)
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