A fossil cephalopod shell related to the nautilus. There are many genera and species, and all are extinct, the typical forms having ex…
Its definition shares important concepts with this word: extinct, order, amphibia, including, typical.
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Labyrinthodonta
An extinct order of Amphibia, including the typical genus Labyrinthodon, and many other allied forms, from the Carboniferous, Permian, and Triassic formations. By recent writers they are divided into two or more orders. See Stegocephala.
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