What defining characteristic places all Yarara snakes within the Class Reptilia?

Answer

Being characterized by having scales or scutes

The classification into the Class Reptilia is based on fundamental characteristics shared by all reptiles, distinguishing them from other vertebrate classes like Amphibia or Mammalia. The primary characteristic mentioned for Reptilia is the presence of scales or scutes covering the body. While other features like being cold-blooded are associated with reptiles, the description explicitly notes that having scales or scutes differentiates them at this taxonomic level.

What defining characteristic places all Yarara snakes within the Class Reptilia?
taxonomyanimalclassificationsnakeviper