They lived during the Carboniferous to the early Permian. There are six different groups. The Acherontiscidae, Adelospondyli, Aïstopoda, Lysorophia, Microsauria and Nectridea. The included species which looked somewhat like newts, eels, snakes and lizards. Some of them were aquatic, semi-aquatic, and terrestrial animals. None of them were big animals.
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