Named By: C. A. Sidor, R. Damiani & W. R. Hammer - 2008.
Classification: Chordata, Amphibia, Temnospondyli, Stereospondyli.
Species: K. collinssoni (type).
Size: Preserved portion of the skull 27 centimetres long by 21 centimetres wide. Reconstructed skull length estimated at 1 meter. Total body size extrapolated from the reconstructed skull length estimated at about 4.5 meters.
Known locations: Antarctica, Transantarctic Mountains - Fremouw Formation.
Time period: Olenekian of the Triassic.
Fossil representation: Partial skull.
Kryostega is one of the growing number of temnospondyl amphibians that are now known from Antarctica. With a reconstructed body length estimated to be about four and a half meters long, Kryostega is so far one of the largest temnospondyl amphibians known to have lived in Antarctica during the Early Triassic, and a candidate for being a key apex predator here at that time. Possible prey animals for Kryostega would include anything from fish and other temnospondyl amphibians, to possibly even land creatures such as cynodonts and other therapsids.
- A new Triassic temnospondyl from Antarctica and a review of Fremouw Formation biostratigraphy. - Journal of Vertebrate Paleontology 28(3):656-663. - C. A. Sidor, R. Damiani & W. R. Hammer - 2008.