Name: Hadrocodium ‭(‬big head‭)‬.
Phonetic: Had-roe-coe-dee-um.
Named By: Z.-X.‭ ‬Luo,‭ ‬A.‭ ‬W.‭ ‬Crompton‭ & ‬A.-L.‭ ‬Sun‭ ‬-‭ ‬2001.
Classification: Chordata,‭ ‬Mamaliaformes.
Species: H.‭ ‬wui‭ (‬type‭)‬.
Diet: Insectivore.
Size: Estimated about‭ ‬3.2‭ ‬centimetres long.
Known locations: China,‭ ‬Yunnan Province‭ ‬-‭ ‬Lower Lufeng Formation.
Time period: Sinemurian of the Jurassic.
Fossil representation: Skull.

       The tiny holotype fossil of Hadrocodium has been considered to represent a very primitive ancestor of modern mammals,‭ ‬though it is not a mammal in itself.‭ ‬This means that there are many unanswered questions about this little creature,‭ ‬specifically concerning the biology of the metabolism and exactly how much like a true mammal it really was.‭ ‬As a living creature the small size of Hadrocodium would have been its best defence against the larger dinosaurian predators of the Jurassic,‭ ‬since it could spend its time scurrying around the forest floor under cover as it hunted for insects to eat.

Further reading
-‭ ‬A new mammaliaform from the Early Jurassic and evolution of mammalian characteristics,‭ ‬Z.-X.‭ ‬Luo,‭ ‬A.‭ ‬W.‭ ‬Crompton‭ & ‬A.-L.‭ ‬Sun‭ ‬-‭ ‬2001.


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