New amphibian

Proterogyrinus (meaning “primitive wanderer” or “ancient tadpole”) is a reptilomorph amphibian from late Carboniferous Scotland and West Virginia, USA.



Proterogyrinus was a descently sized amphibian, its size being on parr with the Chinese giant salamander of the Holocene. Because it was a reptiliomorph, its general morphology would have been reptile-like, such as scaly skin, which would allow it to venture onto land. However as it was still an amphibian, it would have to return to freshwater as it was required for it to reproduce.


Proterogyrinus was well adapted to moving both on land and in water. It had a flattened, broad tail that could be used like fish use theirs to propel through the water, while the limbs are developed for terrestrial movement. Like its possible ancestor Ichthyostega, it also had well more toes than the average critter. This abnormal number of toes was most likely the result of fins morphing for land movement. Proterogyrinus may have been slow to develop, and still retained many small toes rather than a few large ones, the ear structure seems to have been adapted to work best while in the water suggesting that Proterogyrinus may have been a primarily aquatic hunter. It likely lived alongside the arthropods Arthropleura and Meganeura, both a potential meal for it.

In popular culture[]

  • Proterogyrinus appeared in Walking with Monsters.
  • Proterogyrinus appeared in Jurassic World: The Game.


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