What feature of Xenotarsosaurus prompted its designation as a unique genus separate from Carnotaurus?
Answer
Its peculiar tarsus adaptation
The decision to assign *Xenotarsosaurus* its own genus, rather than grouping it simply under existing genera like *Carnotaurus* or *Aucasaurus*, suggests that its distinguishing characteristics were sufficiently unique. The very name given to the creature points directly to this defining trait: its 'strange tarsus.' This adaptation in the ankle structure was evidently significant enough within the Abelisaurid family framework to warrant recognition at the higher genus level, distinguishing its anatomy from its closer relatives.
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