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This list is incomplete; you can help by adding missing items. ( April 2018 ) The page lists all of the families in the clade Tetrapoda , organized by taxonomic ranks .
As aquatic tetrapods began their transition to land, several skeletal changes are thought to have occurred to allow for movement and respiration on land. Some adaptations required to adjust to non-aquatic life include the movement and use of alternating limbs, the use of pelvic appendages as sturdy propulsors, and the use of a solid surface at ...
However, this group represents a paraphyletic grade of primitive stem-tetrapods and is not used by many modern researchers. Phylogenetic analysis has shown Ichthyostega is intermediate between other primitive stegocephalian stem-tetrapods. The evolutionary tree of early stegocephalians below follows the results of one such analysis performed by ...
The evolution of tetrapods began about 400 million years ago in the Devonian Period with the earliest tetrapods evolved from lobe-finned fishes. [1] Tetrapods (under the apomorphy-based definition used on this page) are categorized as animals in the biological superclass Tetrapoda, which includes all living and extinct amphibians, reptiles, birds, and mammals.
However, most tetrapod species today are amniotes, most of which are terrestrial tetrapods whose branch evolved from earlier tetrapods early in the Late Carboniferous. The key innovation in amniotes over amphibians is the amnion , which enables the eggs to retain their aqueous contents on land, rather than needing to stay in water.
Pages in category "Carboniferous tetrapods" The following 9 pages are in this category, out of 9 total. This list may not reflect recent changes. *
Pages in category "Tetrapods" The following 4 pages are in this category, out of 4 total. This list may not reflect recent changes. ...
Prehistoric arthropods of the Cambrian period, during the Paleozoic Era. Subcategories. This category has the following 7 subcategories, out of 7 total. ...