Fossil of Early Mammal Discovered, 125 Million Years Old

Posted on 5/27/2016 10:43:38 AM

Shundong Bi, Biology Department, and coauthors published an article in Scientific Reports describing a new genus and species of symmetrodont mammal from Lower Cretaceous Yixian Formation of China.

 A new symmetrodont mammal (Trechnotheria: Zhangheotheriidae)The fossil is represented by an associated partial skull and dentaries with a nearly complete dentition, and with a dental formula of I4/3 C1/1 P5/4 M3/4. Importantly, the new taxon occupies a basal position within the symmetrodonts and permits discussion of trechnotherian character evolution, ultimately shedding additional light on the evolution of modern therians.

View the paper online: “ A new symmetrodont mammal (Trechnotheria: Zhangheotheriidae) from the Early Cretaceous of China and trechnotherian character evolution”