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  2. Evolution of tetrapods - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_tetrapods

    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.

  3. Tetrapod - Wikipedia

    en.wikipedia.org/wiki/Tetrapod

    The tongue is anchored to the hyoid bone, which was once the lower half of a pair of gill bars (the second pair after the ones that evolved into jaws). [89] [90] [91] The tongue did not evolve until the gills began to disappear. Acanthostega still had gills, so this would have been a later development. In an aquatically feeding animals, the ...

  4. Timeline of fish evolution - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_fish_evolution

    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]

  5. Ichthyostega - Wikipedia

    en.wikipedia.org/wiki/Ichthyostega

    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 ...

  6. Gnathostomata - Wikipedia

    en.wikipedia.org/wiki/Gnathostomata

    The tetrapods evolved from the lobe-finned fishes about 395 million years ago in the Devonian. [23] The specific aquatic ancestors of the tetrapods, and the process by which land colonization occurred, remain unclear, and are areas of active research and debate among palaeontologists at present.

  7. Ancient swamp creature with a toilet seat-shaped head was a ...

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    New animals appeared in the warmer, drier regions near the equator as four-legged vertebrates called stem tetrapods evolved and split into groups that formed the basis for modern animals.

  8. Fossils show huge salamanderlike predator with sharp fangs ...

    www.aol.com/news/fossils-show-huge-salamander...

    The creature's name comes from the Gai-As rock formation in Namibia where the fossils were found and for the late paleontologist Jennifer Clack, who studied how tetrapods evolved.

  9. A Surreal Creature With Jumping Genes Has 30x More DNA Than ...

    www.aol.com/surreal-creature-jumping-genes-30x...

    That fish and its friends eventually evolved into a plethora of species that belong to a group collectively known as tetrapods, which encompasses all four-limbed vertebrate creatures that roam the ...