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The largest living amphibian is the 1.8 m (5 ft 11 in) Chinese giant salamander (Andrias davidianus), but this is dwarfed by the extinct 9 m (30 ft) Prionosuchus from the middle Permian of Brazil. The study of amphibians is called batrachology, while the study of both reptiles and amphibians is called herpetology.
Amphiuma pholeter has one digit on each foot, Amphiuma means has two, and Amphiuma tridactylum has three. In other respects, the species are similar, although there is a significant size difference between A. pholeter and the other two species at maturity.here are no recorded conspicuous external sexual differences. Amphiuma means. Amphiuma tridactylum, the three-toed amphiuma, is the second largest of the three species reaching a maximum size of 106 cm (41.7 inches) in total length. The laterally compressed tail can compose up to 25% of the total body length.