Kayentavenator elysiae

Kayentavenator (meaning "Kayenta hunter") is a genus of small carnivorous tetanuran dinosaur that lived during the Early Jurassic Period. Fossils were recovered from the Kayenta Formation of northeastern Arizona, and were described in 2010.

==Description== The holotype specimen of K. elysiae is a juvenile, as shown by unfused neural spines and would have stood about high at the hip. The adult size of Kayentavenator is unknown. The inclusion of a pubic fenestra is one of the characteristics that Gay uses to set Kayentavenator apart from the contemporaneous, and better known Dilophosaurus. As Dilophosaurus lacks a pubic fenestra as a subadult or an adult, it is unlikely that it had one during any stage of ontogeny. Apomorphies include an ellipsoid acetabulum, the greater trochanter and the head of the femur having been fused, a mediodistal crest that extends 50% of the length of the femur, as well as a prominent accessory condyle on the medial femoral condyle, a groove in dorsal surface of the femoral head that extends out from the centerline of the body, and highly constricted ("waisted") caudal vertebra centra.