Chienkosaurus

Chienkosaurus is a dubious genus of carnivorous theropod dinosaur from the Late Jurassic period of China. Its scientific name, Chienkosaurus ceratosauroides, was given by Yang Zhongjian in 1942. The genus name means "lizard of Jiange County," referring to the discovery location, while the species name suggests a similarity to Ceratosaurus.

Discovery and Classification

The fossil material attributed to Chienkosaurus is limited and has led to its classification as dubious. The holotype consists of four teeth (IVPP V.237). Subsequent examination by Dong et al. in 1983 determined that three of these teeth likely belonged to a mesoeucrocodylian named Hsisosuchus, leaving only one theropod tooth as the definitive evidence for Chienkosaurus. Yang also referred an ulna (IVPP V.193) and a caudal centrum (IVPP V.192) to the genus. Due to the scant and questionable nature of the evidence, paleontologists like Holtz et al. (2004) and Wu et al. (2009) have designated Chienkosaurus as a dubious taxon.

Paleobiology

As a theropod dinosaur, Chienkosaurus was likely bipedal and carnivorous. It is considered possibly related to another Chinese Jurassic theropod, Szechuanosaurus. However, due to the limited fossil record, detailed information about its physical characteristics, size, habitat, or behavior remains speculative and poorly understood.