''Jinbeisaurus'' (meaning "northern

Shanxi Province Shanxi (; ; Chinese postal romanization, formerly romanised as Shansi) is a landlocked Provinces of China, province of the China, People's Republic of China and is part of the North China region. The capital and largest city of the province is ...

lizard" after Shanxi Province in China) is a genus of

tyrannosauroid Tyrannosauroidea (meaning 'tyrant lizard forms') is a superfamily (or clade) of coelurosaurian theropod dinosaurs that includes the family Tyrannosauridae as well as more basal relatives. Tyrannosauroids lived on the Laurasian supercontinent b ...

dinosaur Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is t ...

from the

Upper Cretaceous The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the ...

Huiquanpu Formation The Huiquanpu Formation () is a geological formation in Shanxi and Hebei provinces, China, whose strata date back to the Late Cretaceous period. It predominantly consists of purple-red mudstone, with subordinate grey-white sandy conglomerates. D ...

from

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...

. The type and only species is ''Jinbeisaurus wangi''. It is the first non-avian theropod known from Shanxi. Analysis of the specimen indicates that ''Jinbeisaurus'' is more derived than related tyrannosauroids such as ''

Xiongguanlong ''Xiongguanlong'' ("Grand Pass dragon") is a genus of tyrannosauroid dinosaur that lived in the Early Cretaceous of what is now China. The type species is ''X. baimoensis'', described online in 2009 by a group of researchers from China and the Un ...

'' and phylogenetically more advanced than ''

Suskityrannus ''Suskityrannus'' (meaning "coyote tyrant", ''suski'' meaning "coyote" in Zuni) is a genus of small tyrannosauroid theropod from the Late Cretaceous in southern Laramidia. It contains a single species, ''Suskityrannus hazelae,'' believed to h ...

'', to which it has been compared. ''Jinbeisaurus'' was originally seen as a juvenile specimen of ''

Tarbosaurus ''Tarbosaurus'' ( ; meaning "alarming lizard") is a genus of tyrannosaurid dinosaur that flourished in Asia about 70 million years ago, at the end of the Late Cretaceous Period, considered to contain a single known species, ''Tarbosaurus bataa ...

''.

Description

It is known from holotype specimen SMG V0003, including a "pair of maxillae (nearly complete right bone and incomplete left bone) and an incomplete right dentary, associated with two cervical centra, five dorsal centra, and an incomplete right pubis." It can be distinguished from other tyrannosaurs by "a broad interfenestral strut, a deep fossa on the broad base of the septum between the promaxillary recess and maxillary antrum, a low position of the dorsal row of dentary foramina, a similar number of denticles per unit length on both the mesial and distal carinae of the upper and lower teeth, and an acute angle of about 70 degrees between the posterior process of the foot and the shaft of the pubis."

References

Tyrannosaurs Late Cretaceous dinosaurs of Asia Cretaceous China Fossil taxa described in 2019 {{theropod-stub

Description

See also

References