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Eotetrapodiformes
Eotetrapodiformes is a clade of tetrapodomorphs including the four-limbed vertebrates ("tetrapods" in the traditional sense) and their closest fish fin, finned relatives, two groups of stem tetrapods called tristichopterids and elpistostegalids. The clade was named in 2010 by Michael I. Coates and Matt Friedman, and is defined as "the node-based clade arising from the most recent common ancestor of ''Eusthenopteron'' and ''Ichthyostega'' plus all of its descendants". It thus excludes the basalmost tetrapodomorphs, such as the rhizodonts and megalichthyiforms. Cladogram from Swartz, 2012: References Eotetrapodiforms, Extant Devonian first appearances Evolution of tetrapods {{Lobefinned-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrapodomorph
The Tetrapodomorpha (also known as Choanata) are a clade of vertebrates consisting of tetrapods (four-limbed vertebrates) and their closest sarcopterygian relatives that are more closely related to living tetrapods than to living lungfish. Advanced forms transitional between fish and the early labyrinthodonts, such as ''Tiktaalik'', have been referred to as "fishapods" by their discoverers, being half-fish, half-tetrapods, in appearance and limb morphology. The Tetrapodomorpha contains the crown group tetrapods (the last common ancestor of living tetrapods and all of its descendants) and several groups of early stem tetrapods, which includes several groups of related lobe-finned fishes, collectively known as the osteolepiforms. The Tetrapodamorpha minus the crown group Tetrapoda are the Stem Tetrapoda, a paraphyletic unit encompassing the fish to tetrapod transition. Among the characteristics defining tetrapodomorphs are modifications to the fins, notably a humerus with convex h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
