A new Chengyuchelys latimarginalis (Xinjiangchelyidae) specimen is reported based
on a well-preserved, nearly complete shell from the upper part of the Upper Jurassic
Shangshaximiao Formation of Qijiang District, Chongqing Municipality, China. The Xinjiangchelyidae
were widely distributed in Asia during the Jurassic and were the dominant turtle group
in Asian freshwater ecosystems during the Late Jurassic. The Qijiang specimen adds
a new element to the yet poorly known freshwater vertebrate fauna and extends the
geographical distribution of C. latimarginalis. This paper discusses the intraspecific
variation in C. latimarginalis for the first time. It provides a new insight for studying
the evolution, habitat, and diversity of xinjiangchelyids.
