Name: Acristatherium ‭(‬Crestless beast‭)‬.
Phonetic: Ah-kris-tah-feee-ree-um.
Named By: Yaoming Hu,‭ ‬Jin Meng,‭ ‬Chuankui Li‭ & ‬Yuanqing Wang‭ ‬-‭ ‬2010.
Classification: Chordata,‭ ‬Mammalia,‭ ‬Eutheria.
Species: A.‭ ‬yanensis‭ (‬type‭)‬.
Diet: Insectivore.
Size: Total size unknown,‭ ‬holotype skull is‭ ‬25‭ ‬millimetres long.
Known locations: China,‭ ‬Liaoning Province‭ ‬-‭ ‬Yixian Formation.
Time period: Aptian of the Cretaceous.
Fossil representation: Partial skull.

       Although so far known from only a single partial skull,‭ ‬Acristatherium is thought to represent one of the oldest known eutherian mammals.‭ ‬Acristatherium probably spent most of the time hunting for invertebrate prey which could easily be caught and processed by the small but sharp teeth,‭ ‬while trying to stay out of sight of predatory dinosaurs like Sinornithosaurus,‭ ‬Huaxiagnathus and Tianyuraptor.

Further reading
-‭ ‘‬New basal eutherian mammal from the Early Cretaceous Jehol biota,‭ ‬Liaoning,‭ ‬China,‭ ‬Yaoming Hu,‭ ‬Jin Meng,‭ ‬Chuankui Li‭ & ‬Yuanqing Wang‭ ‬-‭ ‬2010.


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