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However, the axolotl is unusual in that it has a lack of thyroid-stimulating hormone, which is needed for the thyroid to produce thyroxine in order for the axolotl to go through metamorphosis; therefore, it keeps its gills and lives in water all its life, even after it becomes an adult and is able to reproduce. Neoteny is the term for reaching ...
A Mexican amphibian, the axolotl is believed by many to be the Aztec god of fire and lightning. His name was Xolotl, and he took the form of a salamander to avoid sacrifice.
External gills are the gills of an animal, most typically an amphibian, that are exposed to the environment, rather than set inside the pharynx and covered by gill slits, as they are in most fishes. Instead, the respiratory organs are set on a frill of stalks protruding from the sides of an animal's head. The axolotl has three pairs of external ...
Axolotls retain gills and fins as adults; these are juvenile features in most amphibians. Paedomorphosis can be the result of neoteny , the retention of juvenile traits into the adult form as a result of retardation of somatic development, or of progenesis, the acceleration of developmental processes such that the juvenile form becomes a ...
Can you have an axolotl as a pet? It's important to know how to care for them properly, as well as considering legality and environmental issues
Having no lung-like organs, modern amphibious fish and many fish in oxygen-poor water use other methods, such as their gills or their skin to breathe air. Amphibious fish may also have eyes adapted to allow them to see clearly in air, despite the refractive index differences between air and water.
Mexico's axolotl salamander faces a doomsday scenario battered by decades by dirty water, ravenous non-native fish and the steady encroachment of one of the world's biggest megacites. Chris Dignam ...
The density of the water prevents the gills from collapsing and lying on top of each other, which is what happens when a fish is taken out of water." [7] Higher vertebrates do not develop gills, the gill arches form during fetal development, and lay the basis of essential structures such as jaws, the thyroid gland, the larynx, the columella ...