Boca de una rana

Boca de una rana
Boca de una rana: anfibio que vive cerca de los lagos y las albuferas, tiene extremidades posteriores fuertes adaptadas al salto. Se traslada nadando y saltando.
Dientes vomerianos: dientes encajados en el vomér de la rana.
Apertura del esófago: principio de la segunda parte del tubo digestivo.
Orificio du saco vocal (macho): apertura de la bolsa relativa a la voz de la rana macho.
Lengua: órgano gustativo de la rana que le sirve a capturar sus presas.
Glotis: apertura de la laringe.
Orificio de la trompa de Eustaquio: apertura al nivel de la garganta que se une al oreja.
Dientes maxilares: dientes encajados en el hueso de la mandíbula de la rana.
Narices internas: orificios de la vía respiratoria situados en la boca de la rana.

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EN : Amphibian
FR : Amphibia
ES : Amphibia


Amphibians, class Amphibia, such as frogs, toads, salamandesr, newts, and gymnophiona, are cold-blooded animals that metamorphose from a juvenile, water-breathing form to an adult, air-breathing form. Typically, amphibians have four limbs. Unlike other land animals (amniotes), amphibians lay eggs in water, as their fish ancestors did. Amphibians are superficially similar to reptiles. For the purpose of reproduction most amphibians are bound to have fresh water. A few tolerate brackish water, but there are no true seawater amphibians. Several hundred frog species in adaptive radiations, however, do not need any water whatsoever. They reproduce via direct development, an ecological and evolutionary adaptation that has allowed them to be completely independent from free-standing water. Almost all of these frogs live in wet tropical rainforests and their eggs hatch directly into miniature versions of the adult, passing through the tadpole stage within the egg. Several species have also adapted to arid and semi-arid environments, but most of them still need water to lay their eggs. Symbiosis with single celled algae that lives in the jelly-like layer of the eggs has evolved several times. The larvae breathe with exterior gills. After hatching, they start to transform gradually into the adult's appearance. This process is called metamorphosis. Typically, the animals then leave the water and become terrestrial adults, but there are many interesting exceptions to this general way of reproduction.

Animation : Amphibia