Jeholodens was a triconodont, an early mammal. Jeholodens jenkinsi, named by Luo Zhexi and Ji Qiang, dates from the middle Cretaceous period, about 125 million years ago. Its almost complete fossil was recently found in Lianong, China. This long-tailed, quadrupedal mammal was about 5 inches ( cm) long. An insectivore, it had relatively advanced, grasping hands, but a primitive pelvis and hind limbs. It may have had large eyes, and may have been nocturnal (most active at night).