''Polistodon'' is an extinct genus of tritylodonts from the

Bajocian In the geologic timescale, the Bajocian is an age and stage in the Middle Jurassic. It lasted from approximately 170.9 ±0.8 Ma to around 168.2 ±1.2 Ma (million years ago). The Bajocian Age succeeds the Aalenian Age and precedes the Bathonia ...

Callovian In the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 165.3 ± 1.1 Ma (million years ago) and 161.5 ± 1.0 Ma. It is the last stage of the Middle Jurassic, following the Bathonian and preceding the ...

(

Middle Jurassic The Middle Jurassic is the second Epoch (geology), epoch of the Jurassic Period (geology), Period. It lasted from about 174.1 to 161.5 million years ago. Fossils of land-dwelling animals, such as dinosaurs, from the Middle Jurassic are relativel ...

) of

China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

.Fossilworks. "Polistodon." Retrieved from
/ref> It contains one species, ''P. chuannanensis'', which is known from a single skull from the Xiashaximiao Formation. According to one study, it may be a species of the genus '' Stereognathus''.

References

Tritylodontidae Bajocian genera Callovian genera Middle Jurassic synapsids of Asia Jurassic China Fossils of China Fossil taxa described in 1984 {{paleo-cynodont-stub