Older Obdurodon species are known from central Australia, and a closely related species, Monotrematum sudamericanum, from the Paleocene of Patagonia, evidence that platypuses were once Gondwanan. The coronoid and angulary processes of O. dicksoni have quite disappeared in the platypus, leaving the platypus's skull flat on the sides. These show that Obdurodon dicksoni was a large, spoon-billed platypus with an unusually flat, robust skull, fully rooted molars and premolars, but no dentition anterior to the premolars. New information about the skull and dentary of the Miocene platypus. doi:10.1126/sciadv.1601329. Its skull is one of the most perfect fossils known from Riversleigh. Riversleigh Platypus, Obdurodon dicksoni was a large, spoon-billed platypus from the Riversleigh area of northern Australia. 1, 2) Etymology—In recognition of an Aboriginal legend (Archer, 1990) about the origin of the first platypus being the offspring of a male water rat (Bigoon) and a female duck (Tharalkoo). 3. [citation needed] Obdurodon insignis had one more canine tooth (NC1) than its ancestor Steropodon galmani.[1]. However, like O. dicksoni but unlike the modern platypus, it had more permanent dentition. This website may contain names, images and voices of deceased Aboriginal and Torres Strait Islander peoples. Apr 3, 2014 - Obdurodon dicksoni: Riversleigh Platypus: Extinct: Australia Woodburne, M.O. You have reached the end of the main content. It bore two premolars and three molars on each side of the lower jaw. Mathew Crowther, University of Sydney. The Riversleigh Sprite Possum belongs to an extinct group of possums called the ektopodontids. Obdurodon dicksoni is known only from the Riversleigh World Heritage Fossil Site in northwestern Queensland. The reconstructed fossil skull of Obdurodon dicksoni (13 cm long), Aboriginal and Torres Strait Islander Collection, Australian Museum Research Institute (AMRI), Natural Sciences research and collections, Australian Museum Lizard Island Research Station, 2020 Australian Museum Eureka Prizes finalists, 2020 Australian Museum Eureka Prize winners, Become a volunteer at the Australian Museum. The finding provides new clues about the lineage of the modern platypus… Obdurodon dicksoni is an extinct species of ornithorhynchid monotreme discovered in Australia. Obdurodon probably fed on insect larvae, yabbies and other crustaceans, and perhaps small vertebrate animals such as frogs and fish. [1], The name derives from Latin obduros and don, "enduring tooth", a reference to the permanency of the molars. Archer, et al. Where is Riversleigh? Riversleigh Platypus: lt;div|> | | | |Obdurodon|||Temporal range: |Paleocene|? This indicates the mastication technique of O. dicksoni was different from that of the platypus, using the muscles anchored to these processes. [12], The name given to the species was discussed in a 1990 paper by Mike Archer, an Australian mammalogist, detailing a creation story with an Ugly Duckling motif in the context of palaeontology. Alternatively, they may be descended from an as-yet unknown group of early mammals or near-mammals. 2001, 2002). [1] Fragments of jawbone have also been assigned to the species, along with a single piece of post-cranial material, a pelvis. Relationships between members of the platypus family are more clear, although there is comparatively little in the way of fossils and ideas could change if more material surfaces. The only known area of its distribution, the Riversleigh site, was closed forest at the freshwater bodies it inhabited, surrounded by more open woodlands over the region's limestone karst terrain. There are also molar teeth of a third species of Obdurodon from the Mammalon Hill locality, Tirari Desert, central Australia. You have reached the end of the page. Like the living platypus, it probably made burrows in the banks of rivers and streams, and fed on benthic aquatic invertebrates. Even more exciting was the discovery of the teeth of a 61-million-year-old South American relative in 1992. [5], Obdurodon tharalkooschild is an extinct species of monotreme in the genus Obdurodon. Jan 8, 2015 - Obdurodon dicksoni: Riversleigh Platypus: Extinct: Australia There was actually a few teeth found in Riversleigh presenting what may be a 100 cm long specimen. "Description of the skull and non-vestigial dentition of a Miocene platypus (Obdurodon dicksoni) from Riversleigh, Australia, and the problem of monotreme origins". Obdurodon tharalkooschild was the second extinct platypus in Riversleigh and the largest by a good 10-20 cm Platypus kan verwijzen naar: . The species was published in 1992 by Michael Archer, F. A. Jenkins, S. J. The Mammalia discovered at the site includes the Yingabalanaridae (weirdodonta) family, whose classification within the order is currently uncertain. The skull's profile is comparatively flatter than similar species, and as with crocodilians, this may indicate more foraging or feeding at the surface of the water. Placental mammals are represented by more than 35 bat species, and the Riversleigh fossil bat record is considered one of the richest in the world. The shape of its beak suggests that O. dicksoni sought prey by digging in the sides of rivers, whereas the modern platypus digs in the bottom of the river. Riversleigh fossils, any of numerous assemblages of fossils found at Riversleigh Station, in northwestern Queensland, Australia, which together constitute the richest and most diverse collection of fossils ever found on that continent. The genus named was derived from Latin to describe the obdurate, that is persistent, molar which is lost in the modern platypus. The Australian Museum respects and acknowledges the Gadigal people of the Eora Nation as the First Peoples and Traditional Custodians of the land and waterways on which the Museum stands. Other ancestral marsupial forms found at Riversleigh include moles, bandicoot, marsupial 'lions', koala, wombat, kangaroo and possums. ", This page was last edited on 15 November 2020, at 11:42. [9], The septomaxilla (a part of the upper jawbone) of O. dicksoni is bigger than for the platypus, which supposes a hypertrophied beak. O. dicksoni had (like the platypus) shearing crests instead of incisor and canine teeth. Hand; Michael Archer (2016). The Riversleigh Forest Beast was about the size of a sheep. Obdurodon dicksoni is known only from a skull, lower jaw and teeth. To date, there are no known postcranial fossils of Obdurodon dicksoni. Hand, P. Murray, and H. Godthelp. Unlike the platypus which forages on the lakebed, Obdurodon may have foraged in the water column or surface. The fossil history of the platypus shows the modern platypus is just the tip of the iceberg of a diverse radiation. Heritage fossil Site in northwestern Queensland fossil skulls to be excavated from Riversleigh these fossil platypuses had functional molar.. Build to the animal resembled the related modern platypus is just the tip of the Miocene, Musser,,. Is unknown, there 's a wealth of information about our collections of scientific specimens and objects., Hand, S.J., Murray, P. & Godthelp, H., 1992 the end of the World! 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