What unifying morphological characteristic defines the reptile Order Squamata, which includes Crotalus atrox?
Answer
The presence of scales.
The Order Squamata is recognized as the most speciose group among living reptiles, encompassing over ninety percent of all reptile species, including snakes, lizards, and amphisbaenians. The defining characteristic that unites all members of this order is the presence of scales. Although these scales vary significantly in size, texture, and arrangement among different families, their fundamental presence is the key taxonomic feature for placement within Squamata.

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