What unusual skeletal structure gave *Xenotarsosaurus* its descriptive genus name?
Answer
The tarsus (ankle bones)
The genus name *Xenotarsosaurus* directly references the most striking morphological feature noted upon the specimen's initial study: its ankle structure. The tarsus is the collection of bones that forms the ankle, acting as the critical connection point between the lower leg and the foot. The structure observed in this abelisaurid was deemed sufficiently distinct and unusual compared to other known large theropods at the time of its naming. This distinctive pedal specialization suggests that the lineage developed unique adaptations related to locomotion, weight bearing, or gaining purchase on the terrain, indicating strong selective pressure on its foot mechanics.
Related Questions
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