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3(2). Animal with 3 pairs of jointed legs (L); body divided into a head (H) with 1 pair of antennae (A), a  thorax (T) possibly with 1 or 2 pairs of wings or wing pads (WP), and an abdomen (A)
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Insecta 

3 pairs of legs, body divided

Insecta - adult 

Insecta - nymph 

Collembola 

-Animal with more than 3 pairs of jointed legs; thorax never with wings

Note: juvenile Arachnida: Acariformes (water mites) have only 3 pairs of jointed legs; body not divided; microcrustaceans may have legs fully or partially enclosed in a carapace
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Crustacea 

more than 3 pairs of legs

Acarina 

Crustacea  

Acarina 

Crustacea 

legs partially enclosed in a carapace

Crustacea 

legs fully enclosed in a carapace