[dinosaur] Kileskus, tyrannosauroid from Middle Jurassic of Siberia, Russia, new data

Ben Creisler
[email protected]


A new paper:

Alexander O. Averianov, Anastasia Osochnikova, Pavel Skutschas, Sergei
Krasnolutskii, Rico Schellhorn, Julia A. Schultz &Thomas Martin (2019)
New data on the tyrannosauroid dinosaur Kileskus from the Middle Jurassic
of Siberia, Russia.
HIstorical Biology (advance online publication)
Received 16 Jul 2019, Accepted 08 Sep 2019, Published online: 16 Sep 2019
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1080_08912963.2019.1666839&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=y5922n1FoQqVMz55QRfk1P86U1P468nOxLjy_iB2x18&s=-SX1RnApjkNxKJ_leb7iOpe_KVVtLNxQ2FkhpdHGY8M&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.tandfonline.com_doi_full_10.1080_08912963.2019.1666839&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=y5922n1FoQqVMz55QRfk1P86U1P468nOxLjy_iB2x18&s=2MrpeadCxA7RLh0mD0Kj8FTSgYBcn1ZgulxaRMHdnfk&e= 


New postcranial bones (cervical and caudal vertebrae, chevron, fibula) of
the proceratosaurid tyrannosauroid Kileskus aristotocus from the Middle
Jurassic (Bathonian) Itat Formation at Berezovsk coal mine, Krasnoyarsk
Territory, Western Siberia, Russia, reveal three possible autapomorphies of
Kileskus: a deep anterior recess between the neural canal and
prezygapophysis; a distinct pit at the base of the neural spine on the
middle cervical vertebrae; and a ventral groove on the middle caudal
vertebrae. Phylogenetic analysis recovered a nearly horizontal posterior
centrodiapophyseal lamina in the anterior-middle cervicals with the
infrapostzygapophyseal fossa located primarily dorsally to the lamina as a
new synapomorphy for the Proceratosauridae. The deep oval fossa on the
medial surface of the fibula with well-defined margins is a tyrannosauroid
synapomorphy of Kileskus. In other Proceratosauridae the fibula is either
absent or not described in detail. The longitudinal and reticular
vascularization of the primary cortex in the Kileskus tibia suggests a
slower growth rate compared with large-bodied tyrannosaurids.

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