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Cryptobranchoidea

Suborder of salamanders From Wikipedia, the free encyclopedia

Cryptobranchoidea
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The Cryptobranchoidea are a suborder of salamanders found in Asia, European Russia, and the United States. They are known as primitive salamanders, in contrast to Salamandroidea, the advanced salamanders.[1] It has two living subdivisions, Cryptobranchidae (Asian giant salamanders and hellbenders), and Hynobiidae, commonly known as Asian salamanders.

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Giant salamanders are obligate paedomorphs with partial metamorphosis,[2] but Asiatic salamander goes through a full metamorphosis. The only known exceptions are the Longdong stream salamander, which has been documented as facultatively neotenic, and the Ezo salamander, where a now assumed extinct population from Lake Kuttarush in Hokkaido had neotenic traits like gills in adults.[3]

The oldest members of the group are known from the Middle Jurassic (Bathonian) aged Yanliao Biota of China.[4]

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Taxonomy

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This suborder contains only two families at present. All other members are extinct and are only known as fossils.

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References

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