Tetrapods are vertebrate animals with four legs or leg-like appendages, including amphibians, reptiles, dinosaurs, birds, and mammals. They evolved from lobe-finned fish and some evolved into legless forms like snakes. Over time, tetrapods diversified into amphibians and reptiles and eventually freed themselves from the need to lay eggs in water. Some impressive tetrapods, like therapsids, […]
Basal tetrapods evolved from lobe-finned fish during the Devonian Period, and had features unique to tetrapods. Tiktaalik was an intermediate form between fish and amphibians, while Ichthyostega was one of the first true tetrapods with breakthroughs for terrestrial life. Basal tetrapods refer to the tetrapods (four-legged animals) at the root of the tetrapod evolutionary tree, […]
