Fossil mammal found in China possessed reptile like tooth replacement

New Scientist reported that researchers have analyzed a 120 million year old fossil mammal discovered in Liaoning, China, in 2018. The species, named Dongoconodon platycauda, possessed the ability to replace its teeth throughout its lifetime. This trait is common among reptiles but rare among modern mammals, which typically grow only two sets of teeth. [1]

The near complete body fossil reveals a semi aquatic creature that lived alongside dinosaurs during the Cretaceous period. According to New Scientist, the animal had a streamlined body resembling a water rodent and feet almost identical to those of a modern platypus. [1][3]

Body fossils, such as bones and teeth, form when mineral deposits replace original biological tissues over time. Lead researcher Shundong Bi at Yunnan University noted that the distinct anatomy of Dongoconodon platycauda provides new insight into the early evolutionary adaptations of mammals. [1][3]