{"id":261059,"date":"2026-06-04T00:37:52","date_gmt":"2026-06-04T00:37:52","guid":{"rendered":"http:\/\/6a20a8faa5890b34d10f2eab"},"modified":"2026-06-04T00:37:52","modified_gmt":"2026-06-04T00:37:52","slug":"cientificos-de-la-unam-identifican-una-nueva-especie-fosil-de-ajolote-la-mas-antigua-registrada-en-mexico","status":"publish","type":"post","link":"https:\/\/sarmiento24h.com\/?p=261059","title":{"rendered":"Cient\u00edficos de la UNAM identifican una nueva especie f\u00f3sil de ajolote, la m\u00e1s antigua registrada en M\u00e9xico"},"content":{"rendered":"<p>Investigadores de la Facultad de Estudios Superiores Zaragoza (FES Zaragoza) de la Universidad Nacional Aut\u00f3noma de M\u00e9xico (UNAM) identificaron una nueva especie f\u00f3sil de ajolote en una comunidad del estado de Hidalgo. Denominada <em>Ambystoma quetzalcoatli<\/em>, se trata de la primera especie f\u00f3sil de salamandra descrita formalmente en M\u00e9xico y del registro m\u00e1s antiguo conocido del g\u00e9nero <em>Ambystoma<\/em> documentado en el pa\u00eds. De acuerdo con los especialistas, este descubrimiento constituye una pieza clave para comprender el origen y la evoluci\u00f3n de la biodiversidad de la fauna mexicana actual.<\/p>\n<p>El hallazgo tuvo lugar en el municipio hidalguense de Atotonilco el Grande, una regi\u00f3n que en tiempos remotos alberg\u00f3 un extenso sistema lacustre de agua dulce de aproximadamente 85 kil\u00f3metros cuadrados, formado probablemente por la interrupci\u00f3n temporal del cauce del r\u00edo Amajac. En este entorno, caracterizado por un clima templado subh\u00famedo, se han recuperado f\u00f3siles de numerosas plantas, diatomeas, gaster\u00f3podos, ostr\u00e1codos, escarabajos y peces. No obstante, hasta ahora los <a href=\"https:\/\/es.wired.com\/articulos\/en-busca-de-los-ultimos-ajolotes-en-vida-silvestre\">anfibios encontrados<\/a> en la zona no hab\u00edan sido estudiados ni descritos formalmente.<\/p>\n<hr>\n<div class=\"ContentCardEmbedWrapper-hkvhYu kMYDit content-card-embed content-card-embed--stacked\" data-testid=\"ContentCardEmbedWrapper\" readability=\"26.451376146789\">\n<div class=\"ContentCardEmbedImage-bqahne fjmzkP content-card-embed__image\" data-testid=\"ContentCardEmbedImage\"><span class=\"SpanWrapper-kFnjvc eKnjjD responsive-asset\"><picture class=\"ResponsiveImagePicture-jKunQM gjCCFj responsive-image\"><img decoding=\"async\" alt=\"Extremidad de ajolote\" loading=\"lazy\" class=\"ResponsiveImageContainer-dkeESL cQPiWi responsive-image__image\" srcset=\"https:\/\/media.es.wired.com\/photos\/68474d7b47c46ddaa57b9430\/master\/w_120,c_limit\/Limb_duplication.png 120w, https:\/\/media.es.wired.com\/photos\/68474d7b47c46ddaa57b9430\/master\/w_240,c_limit\/Limb_duplication.png 240w, https:\/\/media.es.wired.com\/photos\/68474d7b47c46ddaa57b9430\/master\/w_320,c_limit\/Limb_duplication.png 320w, https:\/\/media.es.wired.com\/photos\/68474d7b47c46ddaa57b9430\/master\/w_640,c_limit\/Limb_duplication.png 640w\" sizes=\"100vw\" src=\"https:\/\/media.es.wired.com\/photos\/68474d7b47c46ddaa57b9430\/master\/w_775%2Cc_limit\/Limb_duplication.png\"><\/picture><\/span><\/div>\n<div class=\"ContentCardEmbedInfo-buyHWH gWLOee\" readability=\"29.563302752294\">\n<div class=\"BaseText-fEwdHD ContentCardEmbedHed-kDKGDs fUtEc dlHXUJ content-card-embed__hed\" data-testid=\"ContentCardEmbedHed\"><a class=\"BaseLink-haTOKm ContentCardEmbedHedLink-iBZsco gAoKdC hhUFQU content-card-embed__hed-link link\" href=\"https:\/\/es.wired.com\/articulos\/la-clave-del-ajolote-para-regenerar-sus-extremidades-cientificos-descubren-el-interruptor-molecular-detras-del-milagro\" data-testid=\"ContentCardEmbedHedLink\">La clave del ajolote para regenerar sus extremidades: cient\u00edficos descubren el interruptor molecular detr\u00e1s del milagro<\/a><\/div>\n<p>Un estudio publicado en <em>Nature<\/em> revela que la clave de los ajolotes no est\u00e1 en la producci\u00f3n de una mol\u00e9cula, sino en su destrucci\u00f3n controlada. Este mecanismo le indica a una extremidad en regeneraci\u00f3n si debe formar un hombro o una mu\u00f1eca, un plan gen\u00e9tico que podr\u00eda inspirar a la futura medicina regenerativa. WIRED conversa con James Monaghan, quien ha descifrado una pieza clave de este rompecabezas biol\u00f3gico.<\/p>\n<\/div>\n<\/div>\n<hr>\n<p>Los investigadores analizaron una docena de ejemplares de salamandras f\u00f3siles recolectados a principios de la d\u00e9cada de 2000 por el Grupo de Investigaci\u00f3n de Paleobot\u00e1nica de la FES Zaragoza. Una parte importante de los espec\u00edmenes se conservaba completa y articulada, lo que permiti\u00f3 realizar una evaluaci\u00f3n anat\u00f3mica detallada y obtener informaci\u00f3n precisa sobre su morfolog\u00eda.<\/p>\n<p><strong>Inicialmente, estos restos fueron identificados de manera preliminar como pertenecientes a una especie del g\u00e9nero <em>Ambystoma<\/em><\/strong>, grupo al que pertenecen los <a href=\"https:\/\/es.wired.com\/articulos\/ajolotes-a-traves-del-bioarte-de-ines-gutierrez\">ajolotes modernos<\/a>. Sin embargo, un equipo encabezado por los investigadores Jorge Herrera Flores y Mar\u00eda Patricia Velasco de Le\u00f3n retom\u00f3 el estudio del material y aplic\u00f3 t\u00e9cnicas de nueva generaci\u00f3n, entre ellas tomograf\u00eda computarizada y comparaciones anat\u00f3micas con especies actuales, para determinar con mayor precisi\u00f3n su identidad.<\/p>\n<p>Gracias a este an\u00e1lisis, los especialistas concluyeron que los f\u00f3siles recuperados hace casi tres d\u00e9cadas correspond\u00edan a una especie completamente nueva, con diferencias anat\u00f3micas significativas respecto a los ajolotes contempor\u00e1neos.<\/p>\n<p>El art\u00edculo <a data-offer-url=\"https:\/\/palaeo-electronica.org\/content\/2026\/5636-ambystoma-quetzalcoatli-a-fossil-axolotl-from-mexico\" class=\"external-link\" data-event-click=\"{&quot;element&quot;:&quot;ExternalLink&quot;,&quot;outgoingURL&quot;:&quot;https:\/\/palaeo-electronica.org\/content\/2026\/5636-ambystoma-quetzalcoatli-a-fossil-axolotl-from-mexico&quot;}\" href=\"https:\/\/palaeo-electronica.org\/content\/2026\/5636-ambystoma-quetzalcoatli-a-fossil-axolotl-from-mexico\" rel=\"nofollow noopener\" target=\"_blank\">publicado<\/a> en la revista cient\u00edfica <em>Palaeontologia Electronica<\/em> se\u00f1ala que el an\u00e1lisis revel\u00f3 rasgos distintivos en el cr\u00e1neo y el esqueleto que no se observan en las especies actuales. Entre las caracter\u00edsticas m\u00e1s relevantes destacan una abertura alargada en la parte superior del cr\u00e1neo, una configuraci\u00f3n distinta del paladar, variaciones en la disposici\u00f3n de algunos huesos craneales y la presencia de 17 v\u00e9rtebras troncales. Este \u00faltimo aspecto resulta particularmente relevante, ya que los ajolotes modernos poseen 16 v\u00e9rtebras o menos.<\/p>\n<p>Para determinar con precisi\u00f3n la identidad de los f\u00f3siles, los autores compararon los restos con 13 especies actuales de <em>Ambystoma<\/em>, incluidas varias end\u00e9micas de M\u00e9xico, como el <a href=\"https:\/\/es.wired.com\/articulos\/el-misterio-del-ajolote-invisible-de-xochimilco-el-censo-no-hallo-ninguno-pero-la-ciencia-prueba-que-siguen-ahi\">ajolote de Xochimilco<\/a> (<em>Ambystoma mexicanum<\/em>), adem\u00e1s de salamandras tigre de M\u00e9xico y Estados Unidos. Para ello recurrieron a im\u00e1genes tridimensionales y escaneos de tomograf\u00eda computarizada disponibles en colecciones cient\u00edficas internacionales.<\/p>\n<p>Como complemento, obtuvieron esqueletos completos de salamandras modernas de la especie <em>Ambystoma velasci<\/em>, utilizados como referencia directa para comparar la forma y estructura de los huesos actuales con los de los f\u00f3siles.<\/p>\n<p>Finalmente, los cient\u00edficos analizaron las posibles relaciones evolutivas entre estas salamandras f\u00f3siles y las especies modernas mediante un estudio comparativo de caracter\u00edsticas \u00f3seas, complementado con investigaciones previas basadas en ADN de salamandras actuales.<\/p>\n<figure class=\"AssetEmbedWrapper-iJvQnD cOWUYC asset-embed\">\n<div class=\"AssetEmbedAssetContainer-fnduJP iaVSwI asset-embed__asset-container\"><span class=\"SpanWrapper-kFnjvc eKnjjD responsive-asset AssetEmbedResponsiveAsset-gaAbQ hXaxHA asset-embed__responsive-asset\"><picture class=\"ResponsiveImagePicture-jKunQM gjCCFj AssetEmbedResponsiveAsset-gaAbQ hXaxHA asset-embed__responsive-asset responsive-image\"><img decoding=\"async\" alt=\"Imgenes del f\u00f3sil de la especie de ajolote Ambystoma quetzalcoatli recin descrita en Mxico.\" loading=\"lazy\" class=\"ResponsiveImageContainer-dkeESL cQPiWi responsive-image__image\" srcset=\"https:\/\/media.es.wired.com\/photos\/6a20ac3ff762cf4b8eb1ba68\/master\/w_120,c_limit\/F%C3%B3siles%20ajolote%20UNAM.jpeg 120w, https:\/\/media.es.wired.com\/photos\/6a20ac3ff762cf4b8eb1ba68\/master\/w_240,c_limit\/F%C3%B3siles%20ajolote%20UNAM.jpeg 240w, https:\/\/media.es.wired.com\/photos\/6a20ac3ff762cf4b8eb1ba68\/master\/w_320,c_limit\/F%C3%B3siles%20ajolote%20UNAM.jpeg 320w, https:\/\/media.es.wired.com\/photos\/6a20ac3ff762cf4b8eb1ba68\/master\/w_640,c_limit\/F%C3%B3siles%20ajolote%20UNAM.jpeg 640w, https:\/\/media.es.wired.com\/photos\/6a20ac3ff762cf4b8eb1ba68\/master\/w_960,c_limit\/F%C3%B3siles%20ajolote%20UNAM.jpeg 960w, https:\/\/media.es.wired.com\/photos\/6a20ac3ff762cf4b8eb1ba68\/master\/w_1280,c_limit\/F%C3%B3siles%20ajolote%20UNAM.jpeg 1280w, https:\/\/media.es.wired.com\/photos\/6a20ac3ff762cf4b8eb1ba68\/master\/w_1600,c_limit\/F%C3%B3siles%20ajolote%20UNAM.jpeg 1600w\" sizes=\"100vw\" src=\"https:\/\/media.es.wired.com\/photos\/6a20ac3ff762cf4b8eb1ba68\/master\/w_1600%2Cc_limit\/F%25C3%25B3siles%2520ajolote%2520UNAM.jpeg\"><\/picture><\/span><\/div>\n<div class=\"CaptionWrapper-bpPcvW iDPSlt caption AssetEmbedCaption-eZIMNW gMgneI asset-embed__caption\" data-testid=\"caption-wrapper\" readability=\"6\"><span class=\"BaseText-fEwdHD CaptionText-cQpRdU kRTNAB hbiMYj caption__text\" readability=\"27\"><\/p>\n<p>Im\u00e1genes del f\u00f3sil de la especie de ajolote <em>Ambystoma quetzalcoatli<\/em> reci\u00e9n descrita en M\u00e9xico.<\/p>\n<p><\/span><span class=\"BaseText-fEwdHD CaptionCredit-cUgOGk iQbGEh hRFzlA caption__credit\">Cortes\u00eda UNAM\/Jorge Herrera Flores<\/span><\/div>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Investigadores de la Facultad de Estudios Superiores&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":261060,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[46],"tags":[],"class_list":["post-261059","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tecnologia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - 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