What is the largest type of salamander.?

Answer 1

Japanese giant salamander. These things get HUGE! They can be up (and over) 5 feet in length.

http://nationalzoo.si.edu/Publications/ZooGoer/2006/5/Giant_Salamanders.cfm

Answer 2

Largest—Japanese giant salamander Andrias japonicus, head-to-tail length 6 feet (1.8 meters); smallest—Thorius arboreus, head-to-tail length 0.6 inches (1.7 centimeters); most salamanders are 2 to 6 inches (5 to 15 centimeters)

Weight: largest—giant salamanders, up to 140 pounds (63 kilograms)

Life span: up to 55 years, depending on species