
The One Toed Amphiuma (Amphiuma pholeter) can grow up to 13 inches. They are the smallest of the three different kinds of Amphiuma. They are found in Southeastern United States.
The Eastern Tiger (Ambystoma tigrinum) can grow up to 13 inches but usually between only 6 to 8.25 inches long. It is found in the eastern United States, southeastern Canada, and Mexico.

The record largest Western Tiger Salamander or Barred Salamander (Ambystoma mavortium) measured in at 13 inches but it was also a neotenic salamander. They usually are 6 to 8.5 inches long. They are found in the western United States.

Coastal Giant Salamander (Dicamptodon tenebrosus) can grow up to 13 inches long but usually only up to 6 inches longs. They are found in the western part of the United States and Canada.

The Common Mudpuppy (Necturus maculosus) is the largest mudpuppy species. The longest one recorded was 19 inches long. They are usually between 8 to 13 inches long. It is found in the Eastern United States and Southeastern Canada.

The Bell’s False Brook Salamander (Isthmura bellii ) can grow up to 14 inches long, making it the largest salamander in the family Plethodontidae. They are found only in Mexico.

The Olm (Proteus anguinus) grows usually between 8 to 12 inches long but they can grow up to 16 inches. They are the largest salamander in Europe.

The Reticulated Siren (Siren reticulata) can grow to 2 feet long but its maximum size hasn’t been recorded since its a new species to science.

Lesser Siren (Siren intermedia) can grow up to 2.25 feet. It is found in Southeastern United States.

The Hellbender or Snot Otter (Cryptobranchus alleganiensis) often grows between 11 and 22 inches long but the record length recorded is 29 inches (2.4 feet) long. It is found in the Southeastern United States.

The Greater Siren (Siren lacertina) can grow up to 3.2 feet long but are usually recorded at lengths between 20 to 30 inches long. It is found in the Southeastern United States.

Three Toed Amphiuma (Amphiuma tridactylum) can grow up to 3.4 feet long but usually only between 1.5 feet to 2.5 feet long. It is found in Southeastern United States.

Two Toed Amphiuma (Amphiuma means) can grow up to 3.8 feet long but are usually around 14.5 to 30 inches long. It is the largest of the Amphiumas. It is found in the Southeastern United States.

Japanese Giant Salamander (Andrias japonicus) measures in at 4.9 feet long, making in the second largest salamander in the world.

Chinese Giant Salamander (Andrias davidianus) is the largest salamander in the world. It has been observed to grow to 5.9 feet but lately most of the salamanders found are smaller than that. The average length is usually around 3.9 feet long.
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