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 ?
En el caso de Materia dispuesta, Mauricio comparte con el ajolote muchas de sus particularidades; el animal aparece constantemente a lo largo de su historia, marcandola y otorgandole sentido.
Como en Bellatin, sera el lector quien construya la turbadora identificacion entre el ajolote que, indiferente al mundo exterior, se mueve solo para comer, con los personajes que se desplazan solo por dinero para conseguir mas marihuana, lejos de cualquier nocion moral, alienados en la fascinacion catatonica de la droga--catatonia que, a su vez, se relaciona con la presencia torturante de la electricidad en el texto, siendo esta el unico estimulo externo que produce reaccion o respuesta fisica; esa presencia siniestra e imprevista genera una asordinada violencia que vuelve el relato mas inquietante pagina tras pagina.
Al perderse la costumbre de este tipo de ecotecnias en el espacio lacustre se contribuye a generar la eutrofizacion y el crecimiento de maleza acuatica en los canales y se propicia una mayor contaminacion en el agua y en el aire, ademas se provoca la disminucion de la cantidad de oxigeno dentro del agua y la consecuente perdida de las condiciones de vida favorables para la vida de la fauna silvestre endemica, como los ajolotes, los peces blancos, etcetera.
Estado actual de los ajolotes del genero Ambystoma del lago de Patzcuaro, Michoacan.
Elhaik: Volviendo a la pregunta inicial, con ese compuesto de humor e ironia y mediante la figura del ajolote, tengo la impresion de que su trabajo contribuye a una burla de los usos y abusos de las metaforas organicas en el contexto de la tradicion de la antropologia nacional y nacionalista mexicana.
Pintor ajolote, heredero del Xolotl, el dios emigrado que busco una segunda tierra, Nissen vive para cruzar fronteras.
El ajolote se utiliza como comida o medicina desde epocas prehispanicas.
Se trata de 31 unidades lexicas: acocil, acocote, ahuaucle, abuehuete, ajolote, amole, ayacahuite, cajete, capulin, colote, chapopote, chiltepin, ejote, epazote, equipai, guaje, guajolote, jicote, jocote, mayate, molcajete, m ole, olote, otate, peyote, pinacate, tenamascle, tiza, tlacuache y totol.
asentamientos irregulares, sobrepoblacion, aumento de la inseguridad, destruccion del sistema de chinampas, desaparicion del ajolote, abandono de su zona arqueologica .
En la primera, titulada "Mitos", hay textos ludicos, ligeros, a veces humoristicos y muy personales, pero en los que se despliega la riqueza de conocimiento del homenajeado, como ocurre con su articulo sobre el ajolote o sobre el arte amerindio.
La UAM trabaja el asunto del ajolote, el Instituto de Biologia de la UNAM tiene un programa muy especifico sobre el tema de la potabilidad del agua.
Lo persiguio su gemelo, y en la persecucion Xolotl se transformo sucesivamente en maiz con doble cana (millaca-xolotl), en maguey de dos cuerpos (mexolotl), en su intento de escapar a una muerte inexorable, antes de que Quetzalcoatl lo alcanzara para infligirle la muerte, en el agua, en su ultima forma de ajolote (axolotl).