Cursorial is a phrase used to describe the legs of some insects and other invertebrates that are modified for running. Cursorial limbs are often slender and can be moved very quickly.
A good example of an insect that has cursorial limbs are tiger beetles (beetles within the Family Carabidae, Subfamily Cicindelinae). Some species of tiger beetle can run at 5mph and, with their large jaws, they are fierce predators.
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