Named By: Mueller - 2007.
Synonyms: Buettneria perfecta, Metoposaurus bakeri, Metoposaurus maleriensis.
Classification: Chordata, Amphibia, Temnospondyli, Stereospondyli, Metoposauridae.
Species: K. perfecta (type), K. bakeri.
Size: About 3 meters long. Skull about 65 centimeters long.
Known locations: USA, including Arizona - Chinle Formation, New Mexico - Garita Creek Formation, Petrified Forest Formation and Bluewater Creek Formation, Pennsylvania - New Oxford Formation, Texas - Tecovas Formation, and Wyoming - Popo Agie Formation, Chugwater Group. Also known from India - Maleri Formation.
Time period: Carnian to Rhaetian of the Triassic.
Fossil representation: Multiple individuals, the genus is one of the most common found.
was originally named as Buettneria back in 1922,
however it was
later realised that Buettneria had already been
used to name a genus of
katydid (bush cricket). In addition
to this a species of
M. bakeri was moved to create a new species of
Koskinonodon, K. bakeri,
in 1931. Additionally another
species of Metoposaurus, M.
maleriensis is now included with
Koskinonodon is best known from the United States, particularly the state of Arizona, where Koskinonodon fossils are known from many members of the Chinle Formation. Remains from India however indicate that Koskinonodon had a much wider distribution than previously thought. Koskinonodon lived in the latter portion of the Triassic, and by the time the Jurassic period started, most of the temnospondyls including Koskinonodon had disappeared. Only a rare few exceptions such as the genera Siderops and Koolasuchus are known to have survived well beyond this point.
- New reptiles and stegocephalians from the Upper Triassic of western Texas - E. C. Case - 1922.
- Triassic amphibians from the Rocky Mountain Region - E. B. Branson & M. G. Mehl. 1929.
- A new metoposaurid amphibian from the Upper Triassic Maleri Formation of central India - T. R. Chowdury - 1965.