Steropodon is a genus of prehistoric platypus-like monotreme, or egg-laying mammal. It contains a single species, Steropodon galmani, that lived about 105 to 93.3 million years ago (mya) during the Cretaceous period, from early to middle Cenomanian.[1] It is one of the oldest monotremes discovered, and is one of the oldest Australian mammal discoveries.
^Poropat, Stephen F.; Bell, Phil R.; Hart, Lachlan J.; Salisbury, Steven W.; Kear, Benjamin P. (2023-04-03). "An annotated checklist of Australian Mesozoic tetrapods". Alcheringa: An Australasian Journal of Palaeontology. 47 (2): 129–205. doi:10.1080/03115518.2023.2228367. ISSN 0311-5518.
Steropodon is a genus of prehistoric platypus-like monotreme, or egg-laying mammal. It contains a single species, Steropodon galmani, that lived about...
platypus) Genus †Patagorhynchus †Patagorhynchus pascuali Another two genera, Steropodon and Teinolophos, were originally thought to belong to the Ornithorhynchidae...
monotreme Family Steropodontidae – paraphyletic assemblage Genus Steropodon Species Steropodon galmani Genus Teinolophos Species Teinolophos trusleri – 123...
to the m2 of Steropodon. The trigonid is compressed and the talonid has no basin. The dentary is about one sixth the size of Steropodon's, and wear facets...
Creek Formation at Lightning Ridge, New South Wales, Australia, as was Steropodon. Kollikodon lived in the Late Cretaceous period, during the Cenomanian...
and Steropodon were once thought to be closely related to the modern platypus, but are now considered more basal taxa. The fossilised Steropodon was discovered...
than eutherians (placentals) and had feet adapted for climbing trees. Steropodon is the oldest monotreme (egg-lying mammal) discovered. It lived in Gondwana...
at Lightning Ridge, New South Wales. These fragments, from the species Steropodon galmani, are the oldest known monotreme fossils. Fossils from the genera...
areas of Britain. Niffler – A small desman-like creature built like a steropodon; >mole-like appearance with platypus-like features (e.g., having a long...
needed] O. insignis had one more canine tooth (NC1) than its ancestor Steropodon galmani. Obdurodon dicksoni was part of the Riversleigh fauna that inhabited...
Pridmore et al find these features sufficient to distinguish it from Steropodon as well as other non-tachyglossid but similar monotremes such as Obdurodon...
al. 1985] (Platypuses) Genus †Monotrematum Pascual et al. 1992 Genus †Steropodon Archer et al. 1985 Genus †Obdurodon Woodburne & Tedford 1975 Family Tachyglossidae...
undescribed ornithorhynchid, Kryoryctes, Kollikodon, Ausktribosphenos, Bishops, Steropodon, and Corriebaatar; all of which were endemic to Australia during this...
during the Quaternary period. The extinct monotremes Teinolophos and Steropodon were once thought to be closely related to the modern platypus, but more...
some alleged Australosphenids were also "crown group" monotremes (e.g. Steropodon) and that other alleged Australosphenids (e.g. Ausktribosphenos, Bishops...