Tetrapods evolved primarily during which period?
Tetrapods evolved primarily during Late Devonian period approximately 390 to 360 million years ago from elpistostegalid lobe-finned fishes such as Tiktaalik roseae, Panderichthys rhombolepis, Acanthostega gunnari and Ichthyostega demonstrating progressive fin-to-limb transition, emergence of neck separating pectoral girdle from skull, loss of operculum and development of weight-bearing limbs with digits. Devonian termed Age of Fishes witnessed rising atmospheric oxygen, forest soils creating shallow swamp habitats. Carboniferous radiated fully terrestrial amphibians, Permian reptiles, Jurassic
Ref: Campbell Biology 12th ed. Chapter 34 Devonian Tetrapod Evolution; NCERT Class 11 Chapter 4 Geological Periods