What distinctive physical trait unites species within the genus *Crotalus*?
Answer
The presence of keratinous segments forming the rattle on the tail.
The genus *Crotalus* is reserved specifically for the New World rattlesnakes, and a major evolutionary trait that unites them is found on the tail. This feature involves the accumulation of keratinous segments that lock together during successive molts, forming the characteristic rattle structure. When shaken, this structure produces a distinctive buzzing or warning sound that is intended to deter potential threats. While the family Viperidae shares venom delivery systems, and the subfamily Crotalinae shares the heat pits, the rattle is the defining, shared anatomical innovation of the genus *Crotalus* itself.
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