Temporal range: Early Cretaceous, 125Ma
Xu & Wang, 2006
Xu & Wang, 2004
Sinucerasaurus Xu & Norell, 2006
Sinusonasus is a genus of dinosaurs from the Early Cretaceous Period, recovered from the Yixian Formation. They lived in what is now the Liaoning Province of China. Sinusonasus was a theropod, specifically a troodontid dinosaur.
The type species, Sinusonasus magnodens, was named and described by Xu Xing and Wang Xiaolin in 2004. The generic name refers to the sinusoid form, in lateral view, of the nasals. The specific name means "big-toothed" in Latin. In a later publication the species is referred to as "Sinucerasaurus" but this is a junior objective synonym.
The holotype, IVPP V 11527, was found in the Lujiatun Member of the Yixian Formation, dating from the Hauterivian. It consists of a partial skeleton including skull and lower jaw fragments and partial tail, pelvis and hind limbs. The maxillary teeth are large. The femur is 141 millimetres long. The chevrons on the caudal vertebrae are so wide that they connect, forming a continuous plate at the underside of the tail.
- Xu X. and Wang X.-l. 2004. "A New Troodontid (Theropoda: Troodontidae) from the Lower Cretaceous Yixian Formation of Western Liaoning, China". Acta Geologica Sinica 78(1): 22-26
- Xu X., and Norell, M., 2006, "Non-avian dinosaur fossils from the Lower Cretaceous Jehol Group of western Liaoning, China", Geological Journal, 41(3-4): 419-437
- Troodontidae at Thescelosaurus!
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