Submissions to this category should relate to the early tetrapod animals of the Devonian and Mississippian periods.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.
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
Only sites that deal exclusively with fossil artiodactyls. See also: Science:Biology:Flora_and_Fauna:Animalia:Chordata:Mammalia:ArtiodactylaThis category is for websites dealing specifically with the fossil record of mammals.