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  2. Secondarily aquatic tetrapods - Wikipedia

    en.wikipedia.org/wiki/Secondarily_aquatic_tetrapods

    Several groups of tetrapods have undergone secondary aquatic adaptation, an evolutionary transition from being purely terrestrial to living at least part of the time in water. These animals are called "secondarily aquatic" because although their ancestors lived on land for hundreds of millions of years, they all originally descended from ...

  3. Skeletal changes of vertebrates transitioning from water to land

    en.wikipedia.org/wiki/Skeletal_changes_of...

    The water-based lateral line system was used substantially by these aquatic tetrapods to detect danger from predators. [2] Within the Osteichthyan diversification, there were no changes related to respiration in the transition as can be seen by the nasal region and palatal morphology in elpistostegalid fishes.

  4. Marine vertebrate - Wikipedia

    en.wikipedia.org/wiki/Marine_vertebrate

    Marine tetrapods are tetrapods that returned from land back to the sea again. The first returns to the ocean may have occurred as early as the Carboniferous Period [ 20 ] whereas other returns occurred as recently as the Cenozoic , as in cetaceans, pinnipeds , [ 21 ] and several modern amphibians .

  5. Tetrapod - Wikipedia

    en.wikipedia.org/wiki/Tetrapod

    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.

  6. Amniote - Wikipedia

    en.wikipedia.org/wiki/Amniote

    Amniotes are distinguished from the other living tetrapod clade — the non-amniote lissamphibians (frogs, salamanders, and caecilians) — by the development of three extraembryonic membranes (amnion for embryonic protection, chorion for gas exchange, and allantois for metabolic waste disposal or storage), thicker and keratinized skin, costal ...

  7. 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.

  8. File:Diagram of the water cycle including some human activity ...

    en.wikipedia.org/wiki/File:Diagram_of_the_water...

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

  9. Ichthyostega - Wikipedia

    en.wikipedia.org/wiki/Ichthyostega

    Ichthyostega possessed lungs and limbs that helped it navigate through shallow water in swamps. Although Ichthyostega is often labelled a ' tetrapod ' because of its limbs and fingers, it evolved long before true crown group tetrapods and could more accurately be referred to as a stegocephalian or stem tetrapod .

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