New giant salamander species discovered in 3.5-million-year-old fossils (sciencedaily.com)
¶This giant salamander lived in the broad freshwater lakes and marshes that covered parts of Kyushu several million years ago. As an adult, it may have reached approximately 1.1 meters in length.
¶This length seemed impressive for a salamander, prehistoric or not, until I realized the Japanese giant salamander(Andrias japonicus) is alive and well in Japan and can grow up to to 1.5 meters in length. These modern day giants are fully aquatic and endemic to present-day Japan. Five feet long!
¶What lead to the extinction of the newly identified prehistoric giant salamander? The linked article headlines a climate change theory (“Climate Change and Extinction”), noting that “[c]ooling temperatures, along with major changes in local habitats, may have contributed to [its] disappearance.” (emphasis added). The underlying paper cautions that the cause is still unclear, explaining:
¶[I]t remains unclear whether such sea-level changes directly affected the Ajimu region. Regardless, the loss of freshwater habitats—whether due to climate cooling, local tectonic uplift, or any marine incursion—could have been a key factor in the disappearance of the new genus.