axolotl

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axolotl

(ăk`səlŏt'əl), a salamandersalamander,
an amphibian of the order Urodela, or Caudata. Salamanders have tails and small, weak limbs; superficially they resemble the unrelated lizards (which are reptiles), but they are easily distinguished by their lack of scales and claws, and by their moist, usually
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, Ambystoma mexicanum, found in certain lakes in the region of Mexico City, which reaches reproductive maturity without losing its larval characteristics. This phenomenon is called neotenyneoteny
, in biology, sexual maturity reached in the larval stage of some animals. Certain environmental conditions can inhibit the completion of metamorphosis; low temperature or lack of available iodine retard the action of the thyroid gland, the larval form may mature
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; in salamanders it is apparently caused by certain environmental conditions, particularly a low level of iodine in the water, which affects the functioning of the thyroid gland. The axolotl grows larger than ordinary larval salamanders and develops sexually, but it retains bushy external gills and a well-developed tail. It also has a broad head and stubby legs; its skin is a black-speckled dark brown. Permanently aquatic, never undergoing metamorphosis to a terrestrial form characteristic of amphibiansamphibian,
in zoology, cold-blooded vertebrate animal of the class Amphibia. There are three living orders of amphibians: the frogs and toads (order Anura, or Salientia), the salamanders and newts (order Urodela, or Caudata), and the caecilians, or limbless amphibians (order
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, it may grow as long as 13 in. (33 cm). It is also known as the Mexican walking fish because of its appearance.

The axolotl was not recognized as a salamander until 1865, when several specimens at the Jardin des Plantes in Paris suddenly underwent metamorphosis. After some experimentation it was discovered that when their pools were dried up most of the animals changed into the adult form. Axolotls will also mature normally if fed thyroid gland extract. The related North American tiger salamander, A. tigrinum, often exhibits neoteny in the Rocky Mts., where the iodine content of the water is low. Since the late 1990s the axolotl has become increasingly endangered in its natural habitat due to pollution and competition from introduced fish.

The axolotl is classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Amphibia, order Urodela, family Ambystomidae.

axolotl

[¦ak·sə¦läd·əl]
(vertebrate zoology)
The neotenous larva of some salamanders in the family Ambystomidae.

axolotl

1. any of several aquatic salamanders of the North American genus Ambystoma, esp A. mexicanum (Mexican axolotl), in which the larval form (including external gills) is retained throughout life under natural conditions (see neoteny): family Ambystomidae
2. any of various other North American salamanders in which neoteny occurs or is induced
References in periodicals archive ?
By modifying gene expression by the axolotls' microRNA, they forced the human pairing of c-Fos with c-Jun.
However, for Axolotl blastema, we could not obtain adequate results regarding the cellular components.
V Bryant, "The migration of dermal cells during blastema formation in axolotls," Developmental Biology, vol.
The restoration of the spinal cord in the axolotl occurs in a three dimensional structure similar to an embryonic spinal cord.
Visualization of retinoic acid signaling in transgenic axolotls during limb development and regeneration.
The name "axolotl" comes from the Aztec language and is often translated to mean "water dog." Axolotls are fully grown by age 2 and range in length from 6 to 18 inches.
had been that of the axolotls. [...] So there was nothing strange in
Although Thompson says that Axolotls connectivity solution was "a great way to start," and he values the system's ability to connect disparate systems, he acknowledges that his HIE is outgrowing its capabilities.
"Axolotls, unlike many of the frogs, fish, flies and worms that are used in the lab, have pluripotent cells in their embryos that are the equivalent to those found in embryos from mammals, in that they can produce germ cells, in addition to somatic cells, a property known as ground-state pluripotency.
All they got were three axolotls, a member of the salamander family which is neither valuable nor rare.
"Our thanks, of course, go to the spitting cobras, axolotls, golden frogs, dwarf chameleons, those happy tortoises, and this (award) belongs not to me or to them but the production team," he said.