Which cotype specimen includes the right hind limb (PVL 612) of Xenotarsosaurus?
Answer
PVL 612
The fossil evidence for *Xenotarsosaurus* is composed of two cotypes. PVL 612 is specifically identified as the specimen containing the right hind limb, which includes the crucial ankle bones that defined the genus. In contrast, the other cotype, UNPSJB PV 184, consists only of two anterior dorsal vertebrae. Because the unique ankle morphology—the complete fusion of the astragalus and calcaneum—is present in PVL 612, this hind limb specimen is arguably the most diagnostically important piece of material known for the species, solidifying PVL 612's importance beyond just being a limb fragment.
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