High Quality Content by WIKIPEDIA articles! Labyrinthodontia (Greek, "maze-toothed") is an older term for any member of the extinct subclass of amphibians, which constituted some of the dominant animals of Late Paleozoic and Early Mesozoic times (about 390 to 210 million years ago). The group is ancestral to all extant landliving vertebrates, and as such constitutes an evolutionary grade (a paraphyletic group) rather than a clade. The name describes the pattern of infolding of the dentin and enamel of the teeth, which are often the only part of the creatures that fossilize. They are also distinguished by a heavily armoured skull roof (hence the older name "Stegocephalia"), and complex vertebrae, the structure of which is useful in older classifications of the group. Данное издание представляет собой компиляцию сведений, находящихся в свободном доступе в среде Интернет в целом, и в информационном сетевом ресурсе "Википедия" в частности. Собранная по частотным запросам указанной...

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