econober.blogg.se - Platypus evolution game wiki

It is known only from two lower and one upper platypus teeth. Monotrematum sudamericanum is now more often held as part of the same genus as Obdurodon.Epoch : Lower Paleocene (61 million years).Discovered in 1992 by Rosendo Pascual, Michael Archer, E.The name was chosen in honour of an indigenous Australian creation story for the platypus, where a duck named Tharalkoo gives birth to a chimeric creature after being ravished by a water-rat. The species is believed to have been carnivorous and twice the size of the modern platypus at a metre long. Evidence for Obdurodon tharalkooschild was based on a single molar tooth discovered at the Two Tree Site of the Riversleigh fossil beds in northwest Queensland.Epoch : Middle and upper Miocene (5–15 mya).Discovered in 2012 by a team from University of New South Wales including Mike Archer, Suzanne Hand, and Rebecca Pian.Obdurodon tharalkooschild Main article: Obdurodon tharalkooschild Its beak must have been proportionally smaller than the one of Obdurodon dicksoni. Obdurodon insignis had one more canine tooth (NC1) than its ancestor Steropodon galmani.

There also have been found M2 with four roots and fragments of jawbone and pelvis. The holotype is an inferior left molar and is kept in the South Australia's Museum, Adelaide.Tedford at Etudunna Formation in the desert of Tirari. Molars had only been found apart from skulls, implying that they were not well-anchored. The roots of the molars were barely a third as high as the crown. They were separated from the shearing crests by an area without dentition. The premolars had only one root and a very different shape from the molars.

The upper jaw bore two premolars and two molars on each side. The M1 had six roots, the M2 had five, and the M3 only one. It bore two premolars and three molars on each side of the lower jaw. dicksoni had (like the platypus) shearing crests instead of incisor and canine teeth. dicksoni sought prey by digging in the sides of rivers, whereas the modern platypus digs in the bottom of the river.

The shape of its beak suggests that O.

dicksoni' retained molar teeth into adulthood, whereas in the modern platypus, the adults only have keratinized pads (juveniles lose their molar teeth upon adulthood). dicksoni's beak has an oval hole surrounded by bones in the center, whereas the platypus' beak has a V-shape and no longer surrounded by bones. dicksoni was different from that of the platypus, using the muscles anchored to these processes. This indicates the mastication technique of O. dicksoni have quite disappeared in the platypus, leaving the platypus's skull flat on the sides.

The coronoid and angulary processes of O.

dicksoni is bigger than for the platypus, which supposes a hypertrophied beak.

The septomaxilla (a part of the upper jawbone) of O.

Obdurodon dicksoni grew profoundly larger than the modern platypus.

The holotype is kept at the Queensland Museum in Brisbane.

Physically, it would have looked much like a modern platypus, although significant differences are few.

This species is characterized by a skull and several scattered teeth.

Godthelp, at Riversleigh in North West Queensland.

Discovered in 1984 by Michael Archer, F.