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Tetrapod. A tetrapod ( / ˈtɛtrəˌpɒd /; [5] from Ancient Greek τετρα- (tetra-) 'four', and πούς (poús) 'foot') is any four- limbed vertebrate animal of the superclass Tetrapoda ( / tɛˈtræpədə / ). [6] Tetrapods include all extant and extinct amphibians and amniotes, with the latter in turn evolving into two major clades, the ...
- Amniota
Amniotes are tetrapod vertebrate animals belonging to the...
- Sauropsids
Sauropsida (Greek for "lizard faces") is a clade of...
- Lobe-Finned Fishes
Sarcopterygii (/ ˌ s ɑːr k ɒ p t ə ˈ r ɪ dʒ i. aɪ /; from...
- Dermophis Mexicanus
Dermophis mexicanus, also known commonly as the Mexican...
- Evolution of tetrapods
The evolution of tetrapods began about 400 million years ago...
- Stem tetrapoda
The Stem Tetrapoda are a cladistically defined group,...
- Amniota
- Evolution
- The Tetrapod Clade
- Classification
- Other Websites
Fishapods
Clear fossil tetrapod tracks from the mid-Devonian predate previous tetrapod records by 18 million years. These tracks are from the Middle Devonian of Poland, nearly 400 million years ago. The footprints were made in the mud of a tropical lagoon, and no animal of that time could have made the tracks except a tetrapod. The find strongly suggests that the animals were fish, not amphibia, when the transition to limbs occurred. The term fishapod is sometimes used. They would have been derived fro...
Romer's gap
Between the lobe-finned fish tetrapods and the first amphibia and amniotes in the Middle Carboniferous lies a gap of 30 million years, with few satisfactory tetrapod fossils. This, noted in the early 1950s by Alfred Romer, is Romer's gap. Some new fossils were found in the 1990s, such as Pederpes, right in the middle of the Romer Gap. The gap still hides details of the transition from fish to tetrapod, but not so much as before. So far, only two fossil sites from the Tournasian (earliest Carb...
The cleidoic egg
Whereas amphibia lay their eggs in water, all other tetrapods (the amniotes) lay cleidoic eggs. These eggs are like private little ponds, protecting and nourishing the embryo until it grows into a hatchling. This was a key evolutionary 'invention', which allowed the amniotes to invade the land. Once the amniotes were truly land animals, there followed a huge adaptive radiation. This was one of the most significant advances in vertebrate evolution.
The tetrapod clade separated from fish in the Devonian. The amniotes were the earliest to lay cleidoic eggs. The Synapsids (> mammals) and the Sauropsids (> reptiles) are sister clades, and in particular, reptiles did notgive rise to mammals.
A partial taxonomy of the tetrapods: 1. Phylum Chordata 1.1. Class Sarcopterygii 1.1.1. Subclass Tetrapodomorpha 1.1.1.1. Eusthenopteron 1.1.1.2. Panderichthys 1.1.1.3. Tiktaalik 1.2. Superclass Tetrapoda 1.2.1. Pederpes 1.2.2. Whatcheeria 1.2.3. Class Amphibia 1.2.3.1. (Subclass Labyrinthodontia) 1.2.3.2. Subclass Lepospondyli 1.2.3.3. Subclass Te...
"Tetrapod"? What is a tetrapod? Archived 2008-02-13 at the Wayback MachineTetrapod cladograms Archived 2010-01-25 at the Wayback Machine - similar to genealogical family treesTetrapod environments of the Upper Devonian Archived 2010-08-29 at the Wayback MachinePeople also ask
What is a tetrapod?
What is a tetrapod frog?
What is a crown tetrapod?
What are stem tetrapods?
The word "Tetrapoda" means "four legs" in Greek. Amphibians , reptiles (including dinosaurs and birds ) and mammals are the major groups of the Tetrapoda. Tetrapods include all land-living vertebrates, such as frogs, turtles, hawks, and lions. The group also includes a number of animals that have returned to life in the water, such as sea ...
Cope, 1868. Subgroups. See text. Stegocephali (often spelled Stegocephalia, from Greek στεγοκεφαλια, lit. "roofed head") is a clade of vertebrate animals containing all fully limbed tetrapodomorphs. It is equivalent to a broad definition of the superclass Tetrapoda: under this broad definition, the term "tetrapod" applies to any ...
Jul 17, 2017 · The Origin of the Tetrapods. Published online by Cambridge University Press: 17 July 2017. Keith Stewart Thomson. Article. Metrics. Get access. Cite. Rights & Permissions. Extract. The origin of tetrapods is one of the longest standing (and still not fully resolved) fields in vertebrate evolution (Thomson, 1993).
