#fossil amphibian

• Actinodon — A term with double structural valence; in paleontology, it defines a fossil genus of prehistoric amphibians (temnospondyls) from the Permian period, characterized by a dentition featuring distinct radiating striations. In modern zoology, it represents a species or genus of Asian salamanders (such as the stream salamanders related to the Actinodon / Pseudohynobius complex) whose microscopic dental structures are arranged as divergent rays on the palatal bones.
• Anthracosaur — A generic term for large fossil amphibians with transitional characteristics between amphibians and reptiles, which lived during the Paleozoic era, particularly during the Carboniferous and Permian periods. These primitive tetrapods were top predators in swamp ecosystems, featuring massive skulls, sharp labyrinthodont teeth, and a lifestyle adapted to both deep aquatic environments and early terrestrial movement.