During the Devonian Period vertebrate life underwent a fundamental change, moving gradually from the water to the land.
The transformation of fish into tetrapods (animals with four limbs) ranks alongside the development of the backbone and the amniote egg as a key moment in animal evolution.
Submissions to this category should relate to the early tetrapod animals of the Devonian and Mississippian periods.
Sites dealing with the tetrapods of later periods should be submitted to those categories, such as:
Science: Earth Sciences: Paleontology: By Geological Interval: Paleozoic: Permian