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==Phthiraptera introduction==
−Lice are obligate ectoparasites of every avian and most mammalian species. They are only a few millimeters long and like [[Fleas|fleas]], are wingless but unlike [[Fleas|fleas]] are dorsoventrally flattened.
−Lice are host specific, permanent parasites which cause [[Parasitic skin infections - Pathology#Lice|pediculosis]]. The louse saliva and faeces contain allergenic substances which cause irritation, rubbing, licking and skin damage leading to decreased host productivity.
−Mammalian lice species have a single pair of claws on the ends of stout legs, whereas avian lice species have a double claw on each leg.
−There are two main groups of veterinary importance, the mallophaga (chewing lice) and anoplura (sucking lice).
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<categorytree mode=pages style="float:right; clear:right; margin-left:1ex; border:1px solid gray; padding:0.7ex; background-color:white;">Insecta</categorytree>
<categorytree mode=pages style="float:right; clear:right; margin-left:1ex; border:1px solid gray; padding:0.7ex; background-color:white;">Insecta</categorytree>
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