What unique morphological feature distinguishes the Bipes genus within the amphisbaenians group?
It is the only family within the amphisbaenians (Bipedidae) to possess small, functional front limbs
The *Bipes* genus occupies a unique evolutionary position within the order Squamata, specifically within the amphisbaenians (worm lizards). While most amphisbaenians are known for being almost entirely limbless burrowers, the *Bipes* genus, belonging to the family Bipedidae, is exceptional because it retains two small, strong, paddle-like forelimbs tipped with claws. These limbs are used for digging and pulling the animal along the surface. Conversely, their hind limbs are entirely absent externally, existing only as vestigial bones detectable through advanced imaging techniques like X-rays. This combination—functional forelimbs on an otherwise legless body plan evolved for fossorial life—is what sets the genus apart within its classification.
