is also considered a state-threatened species in Illinois. References Environment Canada - Species at Risk: Jefferson Salamander Amphibians of Canada: Jefferson salamander US Geological Survey - Northern Prairie Wildlife Research Center: Jefferson Salamander Names of the Reptiles and Amphibians of North America Genetics of Jefferson Salamander References Jefferson Salamander species account and conservation status External links Mole salamanders Amphibians of Canada Amphibians of the United States Fauna of the Great Lakes region (North America) Fauna of the Northeastern United States Fauna of the Southeastern United States Cenozoic amphibians of North America Extant Pleistocene first appearances Pleistocene animals of North America Pleistocene United States Amphibians described in 1827