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  2. Amphibian - Wikipedia

    en.wikipedia.org/wiki/Amphibian

    Most amphibians lay their eggs in water and have aquatic larvae that undergo metamorphosis to become terrestrial adults. Amphibians breathe by means of a pump action in which air is first drawn into the buccopharyngeal region through the nostrils. These are then closed and the air is forced into the lungs by contraction of the throat. [43]

  3. Metamorphosis - Wikipedia

    en.wikipedia.org/wiki/Metamorphosis

    A dragonfly in its final moult, undergoing metamorphosis, it begins transforming from its nymph form to an adult. Metamorphosis is a biological process by which an animal physically develops including birth transformation or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation. [1]

  4. Caecilian - Wikipedia

    en.wikipedia.org/wiki/Caecilian

    About 25% of the species are oviparous (egg-laying); the eggs are laid in terrestrial nests rather than in water and are guarded by the female. For some species, the young caecilians are already metamorphosed when they hatch; others hatch as larvae. The larvae are not fully aquatic, but spend the daytime in the soil near the water. [15] [53]

  5. Tadpole - Wikipedia

    en.wikipedia.org/wiki/Tadpole

    The life cycle of all amphibians involves a larval stage that is intermediate between embryo and adult. In most cases this larval stage is a limbless free-living organism that has a tail and is referred to as a tadpole, although in a few cases (e.g., in the Breviceps and Probreviceps genera of frogs) direct development occurs in which the ...

  6. Newt - Wikipedia

    en.wikipedia.org/wiki/Newt

    After hatching, they eat algae, small invertebrates, or other amphibian larvae. [citation needed] During the subsequent few months, the larvae undergo metamorphosis, during which they develop legs, and the gills are absorbed and replaced by air-breathing lungs. [11]

  7. Olm - Wikipedia

    en.wikipedia.org/wiki/Olm

    In other amphibians, the metamorphosis is regulated by the hormone thyroxine, secreted by the thyroid gland. The thyroid is normally developed and functioning in the olm, so the lack of metamorphosis is due to the unresponsiveness of key tissues to thyroxine. [21] Longevity is estimated at up to 58 years. [45]

  8. Larva - Wikipedia

    en.wikipedia.org/wiki/Larva

    A larva (/ ˈ l ɑːr v ə /; pl.: larvae / ˈ l ɑːr v iː /) is a distinct juvenile form many animals undergo before metamorphosis into their next life stage. Animals with indirect development such as insects, some arachnids, amphibians, or cnidarians typically have a larval phase of their life cycle.

  9. Axolotl - Wikipedia

    en.wikipedia.org/wiki/Axolotl

    The axolotl (/ ˈ æ k s ə l ɒ t əl / ⓘ; from Classical Nahuatl: āxōlōtl [aːˈʃoːloːtɬ] ⓘ) (Ambystoma mexicanum) [3] is a paedomorphic salamander closely related to the tiger salamander.