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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.
The first tetrapods appeared in the fossil record over a period, the beginning and end of which are marked with extinction events. This lasted until the end of the Devonian 359 mya. The ancestors of all tetrapods began adapting to walking on land, their strong pectoral and pelvic fins gradually evolved into legs (see Tiktaalik ). [ 38 ]
There is no evidence that it did so, only that it may have been anatomically capable of doing so. [58] [59] The publication in 2018 of Tutusius umlambo and Umzantsia amazana from high latitude Gondwana setting indicate that the tetrapods enjoyed a global distribution by the end of the Devonian and even extend into the high latitudes. [60]
The fins of lobe-finned fish differ from those of all other fish in that each is borne on a fleshy, lobelike, scaly stalk extending from the body. The pectoral and pelvic fins are articulated in ways resembling the tetrapod limbs they were the precursors to. The fins evolved into the legs of the first tetrapod land vertebrates, amphibians.
Though stem-tetrapods originated in the preceding Devonian, it was in the earliest Carboniferous that the first crown tetrapods appeared, with full scaleless skin and five digits. During this time, amphibians (including many extinct groups unrelated to modern forms, referred to as "basal tetrapods") were the predominant tetrapods, and included ...
The Fighting Irish are averaging 30.3 points per game when attempting 30 or more passes, an average inflated by a 52-point outburst against Florida State, and 39.9 points per game when making ...
Similar to Eusthenopteron, the radials do not articulate with the radius on the distal end. [3] Acanthostega also has a 1:2 ratio of humerus to radius and ulna, a feature seen in all tetrapods higher than Acanthostega on the phylogeny. [3] Unlike Panderichthys, Acanthostega hind limbs are at least the size of its fore limbs, if not larger. [3]
Florida’s premier expert on the pesky insects weighs in. Lovebugs, notorious for their midair mating, are typically rampant twice a year: Once in late April and May and again in late August and ...