Kileskus

Kileskus (meaning "lizard" in the Khakas language) is a genus of tyrannosauroid dinosaur known from partial remains found in Middle Jurassic (Bathonian stage) Itat Formation of Sharypovsky District, Krasnoyarsk Krai (Russia). Fossils recovered include the holotype maxilla, a premaxilla, a surangular, and a few bones from the hand and foot. Additional remains referred to the genus include cervical and caudal vertebrae, as well as a fibula. The skull bones are similar to those of Proceratosaurus. The type species is K. aristotocus, named in 2010 by Averianov and colleagues.

Classification

Kileskus has been included in two phylogenetic analyses and found to be a basal proceratosaurid both times.

Although it is unknown whether Kileskus sported a nasal crest, it can be assigned to Proceratosauridae due to a number of other features. These include elongated external nares, a short ventral margin of the premaxilla, and the area of the antorbital fossa directly below the antorbital fenestra being deeper than the maxilla directly below it. Kileskus also shares with Proceratosaurus nares inclined posterodorsally at a 40-degree angle to the skull. Kileskus is distinguished from other proceratosaurids by the anterior rim of its maxilla being confluent with the ascending process of the maxilla and gently sloping posterodorsally.