|1st Species||Koskinonodon perfectus|
|2nd Species||Koskinonodon bakeri|
|Time Range||228-205 mya|
|Location||United States of America, India|
|Physical Dimensions||2.4 meters long|
Koskinonodon is a metoposaurid temnospondyl amphibian from the Late Triassic of the United States of America and India. It was officially named in 1929 by Edward B. Branson and Maurice G. Mehl. It was one of the most common amphibians of Triassic North America, and it was once called "Buettneria" (right before being renamed to Koskinonodon due to "Buettneria" already being occupied by a now-defunct genus of katydid).
Koskinonodon resembled the generic temnospondyl, with 4 legs, a long tail similar to that of a tadpole, a bulky body, a big, semi-flat head with big jaws, and eyes on the top of its head. However, it had one difference; its eyes were situated near the tip of its snout, giving it a frog-like appearance (unlike those of other temnospondyl amphibians, which were placed in a more normal position). Its body would have been covered in smooth skin.
Unlike most other amphibians (which were capable of moving around on land), Koskinonodon was almost fully aquatic, using its limbs to navigate around dense weeds and underwater obstacles a great deal of the time. This comes from the fact that its limbs were somewhat weak, although they still capable of performing rudimentary dragging on land (unlike those of the fully aquatic Mastodonsaurus); as well as this, it had a lateral line that was able to detect changes in water pressure (usually made from the movements of swimming animals), allowing it to home in on prey detected from the slightest movements. Another discovery that confirms this is the massive bone beds that have shown that Koskinonodon individuals died en masse when pools dried up during deadly droughts and the amphibians gathered together, waiting for the water to be replenished. As well as this, Koskinonodon would have been an ambush hunter, lurking near underwater plants and waiting for prey to come by; once they did, it would use its tail to burst out of the underwater vegetation and swallow them whole with its large jaws.