Name: Koskinonodon.
Phonetic: Kos-kin-o-don.
Named By: E.‭ ‬B.‭ ‬Branson and M.‭ ‬G.‭ ‬Mehl‭ ‬-‭ ‬1929‭ (‬Originally named as Buettneria by case in‭ ‬1922‭)‬.
Synonyms: Buettneria perfecta,‭ ‬Metoposaurus bakeri,‭ ‬Metoposaurus maleriensis.
Classification: Chordata,‭ ‬Amphibia,‭ ‬Temnospondyli,‭ ‬Stereospondyli,‭ ‬Metoposauridae.
Species: K.‭ ‬perfecta‭ (‬type‭)‬,‭ ‬K.‭ ‬bakeri.
Diet: Carnivore/Piscivore.
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.

       Koskinonodon 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)‬.‭ ‬Therefore in‭ ‬1929‭ ‬this temnospondyl amphibian was renamed Koskinonodon.‭ ‬In addition to this a species of Metoposaurus,‭ ‬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.
       Koskinonodon is regarded as a metoposaurid temnospondyl amphibian,‭ ‬which means that it is closest to genera such as Metoposaurus and Apachesaurus.‭ ‬These temnopondyls are noted for having eyes that were situated in a more forward position on their skulls than the eyes of other similar temnospondyl groups.‭ ‬Also like its relative genera,‭ ‬Koskinonodon seems to have been more at‭ ‬home in the water where it probably hunted for fish and possibly other amphibians.‭ ‬The limbs are generally not that well supported for terrestrial locomotion,‭ ‬and the presence of a lateral line formed by sensory sulci would have detected changes in water pressure,‭ ‬allowing them to pick up upon the movements of nearby swimming animals.
       Further evidence for a mostly aquatic lifestyle can be inferred from collections of Koskinonodon which can be interpreted as mass graves where a body of water dried out,‭ ‬leaving many Koskinonodon exposed to the dry air.‭ ‬The remains of these Koskinonodon are found so close together that they seem to have clustered together in the last remnants of water before death.‭ ‬This may have been the result of a body of water not being replenished by seasonal rain or flood water.‭
       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.

Further reading
-‭ ‬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.


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