Centaurism is a term created by Sigmund Nastrazzuro referring to the phenomenon of evolution repurposing a pair of limbs for something other than locomotion. The name comes from cases such as the praying mantis or mantis shrimp, where posture changes and the repurposed limbs are used for fighting or manipulation. However, the term also applies to cases where the limb takes on other functions, such as sensory or balance; and a change in posture does not always occur.