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is a suborder of salamanders found in the eastern United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...
, and Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...
. They are known as primitive salamanders
, in contrast to Salamandroidea
Salamandroidea is a suborder of salamanders, referred to as advanced salamanders. The members of the suborder are found worldwide except for Antarctica, Southern Sahara, and Oceania. They differ from suborder Cryptobranchoidea as their angular and prearticular bones in their lower jaw are fused and...
, or advanced salamander
Some species of the fully aquatic Cryptobranchidae
family are known as giant salamanders
due to their large size.
This suborder contains only two families in the present times. Other families went extinct in the past and are only known as fossils.