Amphibia -

All approximately of amphibians belong to the subclass Lissamphibia, which is divided into three distinct orders:

These proto-amphibians retained fish-like tails and hearing mechanisms but had sturdy limb girdles to support their weight on muddy substrates. They diversified into massive, armoured forms during the Carboniferous period (Labyrinthodonts) before reptiles split off from amphibian ancestors by developing the (a shelled egg that can be laid on dry land). amphibia