Kileskus
From the Khakas language word 'kileskus' meaning 'lizard'. The species name 'aristotocus' refers to its many offspring.
Kileskus 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 species 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.
Diagnosis
- Ascending process of maxilla confluent with anterior rim and gently sloping posterodorsally
- Anterodorsal process of premaxilla inclined slightly anterodorsally, nares inclined posterodorsally at ~40°
- Antorbital fossa ventral depth much greater than maxilla depth below ventral margin
- Four premaxillary teeth with D-shaped cross-section in some
- Seventeen maxillary tooth positions
- Elongated external naris exceeding 20% of skull length
- Antorbital fossa extends anteriorly to about fourth tooth position
Species
Kileskus aristotocus Averianov et al., 2010
Type species
From Ancient Greek 'aristos' meaning 'best' and 'tokos' meaning 'offspring' or 'birth', giving 'aristocratic offspring' or 'excellent parent', in reference to its basal position in tyrannosauroid evolution.
- Holotype
- ZIN PH 5/117 , Zoological Institute, Russian Academy of Sciences
- Material
- Incomplete right maxilla, left premaxilla, posterior fragment left surangular, and postcranial elements
- Horizon
- upper Itat Formation, Bathonian, Middle Jurassic , 168.2–165.3 million years ago
- Locality
- Berezovsk Quarry, Krasnoyarsk, Russia
References
- Averianov, A. O.; Krasnolutskii, S. A.; Ivantsov, S. V. (2010). A new basal coelurosaur (Dinosauria: Theropoda) from the Middle Jurassic of Siberia. Proceedings of the Zoological Institute RAS 314(1): 42-57. Zoological Institute of the Russian Academy of Sciences. doi:10.31610/trudyzin/2010.314.1.42 averianov2010a
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Paul, G. S. (2024). The Princeton Field Guide to Predatory Dinosaurs. Princeton University Press.
Source of the appearance features.
paul2024b