Steropodon

Steh-roe-poe-don.
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Liam Carter

Paleoanthropologist

Liam Carter explores the roots of humanity by studying early human fossils and artifacts. His ground-breaking work has provided a deeper understanding of our ancestors' lifestyles and social structures.

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Name

Steropodon ‭(‬Lightning tooth‭)‬.

Phonetic

Steh-roe-poe-don.

Named By

Archer,‭ ‬Flannery,‭ ‬Ritchie,‭ & ‬Molnar‭ ‬-‭ ‬1985.

Classification

Chordata,‭ ‬Mammalia,‭ ‬Monotremata,‭ ‬Platypoda,‭ ‬Steropodontidae.

Diet

Carnivore.

Species

S.‭ ‬glamani‭

Size

Estimated between‭ ‬40-50‭ ‬centimetres long.

Known locations

Australia,‭ ‬New South Wales,‭ ‬Lightning Ridge‭ ‬-‭ ‬Griman Creek Formation.

Time Period

Mid Albian of the Cretaceous.

Fossil representation

Single opalised right mandible with‭ ‬3‭ ‬molar teeth.

In Depth

       Before the description of Teinolophos in‭ ‬1999,‭ ‬Steropodon was considered to be the earliest ancestor of the platypus.‭ ‬Comparison to mammals like the platypus has yielded body estimates of around forty to fifty centimetres long,‭ ‬something that would make Steropodon one of the larger known mammals of the early Cretaceous period.‭ ‬If Steropodon lived like a modern day platypus then it likely hunted in water like them too.‭ ‬Also by staying close to water,‭ ‬Steropodon may have been able to avoid the large theropod dinosaurs like Australovenator that were in Australia at this time.‭ ‬The bad news however is that by living in around water it may have come into contact with Cretaceous era crocodiles like Isisfordia.

       As often happens with Australian fossils,‭ ‬the jaw bone of Steropodon has been turned to opal.‭ ‬Another monotreme mammal that is also named from the same location and from only an‭ ‬opalised jaw is Kollikodon.‭ ‬This process of opalisation has also happened to fossils of the dinosaurs Kakuru,‭ ‬Rapator and Walgettosuchus.

Further Reading

– First Mesozoic mammal from Australia – an early Cretaceous monotreme. – Nature 318:363-366. – M. Archer, T. F. Flannery, A. Ritchie & R. E. Molnar – 1985.

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