{"id":11417,"date":"2021-08-12T19:52:13","date_gmt":"2021-08-13T00:52:13","guid":{"rendered":"http:\/\/losperiodistas.com.mx\/portal\/?p=11417"},"modified":"2021-08-12T19:54:27","modified_gmt":"2021-08-13T00:54:27","slug":"un-antepasado-prehistorico-sorprendente","status":"publish","type":"post","link":"https:\/\/losperiodistas.com.mx\/portal\/un-antepasado-prehistorico-sorprendente\/","title":{"rendered":"Un antepasado prehist\u00f3rico sorprendente | ABC"},"content":{"rendered":"\n<p style=\"font-size:18px\"><em>Un cr\u00e1neo diminuto y fosilizado\u00a0 encontrado en los Andes chilenos da un vuelco a la teor\u00eda de que las cabezas de los primates fueron aumentando de tama\u00f1o con el paso del tiempo. Y revela interesantes datos sobre los simios de hace 20 millones de a\u00f1os.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"676\" src=\"https:\/\/losperiodistas.com.mx\/portal\/wp-content\/uploads\/2021\/08\/Captura-de-Pantalla-2021-08-12-a-las-19.49.44-1024x676.jpg\" alt=\"\" class=\"wp-image-11418\" srcset=\"https:\/\/losperiodistas.com.mx\/portal\/wp-content\/uploads\/2021\/08\/Captura-de-Pantalla-2021-08-12-a-las-19.49.44-1024x676.jpg 1024w, https:\/\/losperiodistas.com.mx\/portal\/wp-content\/uploads\/2021\/08\/Captura-de-Pantalla-2021-08-12-a-las-19.49.44-300x198.jpg 300w, https:\/\/losperiodistas.com.mx\/portal\/wp-content\/uploads\/2021\/08\/Captura-de-Pantalla-2021-08-12-a-las-19.49.44-768x507.jpg 768w, https:\/\/losperiodistas.com.mx\/portal\/wp-content\/uploads\/2021\/08\/Captura-de-Pantalla-2021-08-12-a-las-19.49.44-1536x1014.jpg 1536w, https:\/\/losperiodistas.com.mx\/portal\/wp-content\/uploads\/2021\/08\/Captura-de-Pantalla-2021-08-12-a-las-19.49.44.jpg 1970w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption>N.WONG Y M. ELISSON \/ AMNH<\/figcaption><\/figure>\n\n\n\n<p class=\"has-vivid-cyan-blue-color has-text-color has-medium-font-size\">F\u00c1TIMA URIBARRI \/ ABC<\/p>\n\n\n\n<p>Este cr\u00e1neo fosilizado diminuto \u2013de la especie\u00a0<em>Chilecebus carrascoensis<\/em>\u2013 ha dado un vuelco a las teor\u00edas evolutivas. Se pensaba que los cr\u00e1neos (y cerebros) de los primates antropoides fueron aumentando de tama\u00f1o con el paso del tiempo: el\u00a0<em>Chilecebus<\/em>\u00a0demuestra que esa evoluci\u00f3n fue m\u00e1s compleja de lo que se cre\u00eda y que \u00abhubo episodios de reducci\u00f3n real del tama\u00f1o relativo del cerebro en ciertos grupos\u00bb, en palabras de John Flynn, del Museo Americano de Historia Natural.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Este monito era un animal diurno con un cerebro m\u00e1s desarrollado de lo que se cre\u00eda<\/h2>\n\n\n\n<p>\u00abSabemos poco de cu\u00e1ndo comenz\u00f3 a engrandecerse el cerebro humano\u00bb, ha explicado Xijun Ni, investigador de la Academia de Ciencias de China, uno de los participantes en el estudio de la calaverita del&nbsp;<em>Chilecebus.<\/em><\/p>\n\n\n\n<p>Sabemos poco porque apenas se han encontrado f\u00f3siles bien conservados de \u00e9poca tan antigua. Es otro valor a\u00f1adido a esta pieza \u00fanica: el cr\u00e1neo del&nbsp;<em>Chilecebus&nbsp; carrascoensis<\/em>&nbsp;(llamado as\u00ed porque lo encontr\u00f3 el paleont\u00f3logo chileno Gabriel Carrasco) se ha conservado tan bien que ha facilitado a los estudiosos interesante informaci\u00f3n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Olfato, o\u00eddo y tama\u00f1o de la cabeza<\/h2>\n\n\n\n<p>Se ha averiguado, por ejemplo, que su Coeficiente de Encefalizaci\u00f3n (un baremo que indica la proporci\u00f3n del tama\u00f1o del cuerpo y el de la cabeza), era escaso. O sea, que este monito que correteaba por los Andes chilenos hace 20 millones de a\u00f1os ten\u00eda la cabeza peque\u00f1a en relaci\u00f3n a su cuerpo.<\/p>\n\n\n\n<p>Las tomograf\u00edas computarizadas han mostrado tambi\u00e9n que sus sistemas olfativos y visuales no estaban compensados: es habitual que s\u00ed se compensen y que cuando hay poco olfato la vista se desarrolle m\u00e1s y viceversa. Ambos sistemas estaban menos relaciones de lo que est\u00e1n ahora en los simios.<\/p>\n\n\n\n<p>Los investigadores de Estados Unidos y China que lo han examinado tambi\u00e9n han descubierto que era un animal diurno, as\u00ed lo indica el tama\u00f1o de la apertura para el nervio \u00f3ptico.<\/p>\n\n\n\n<p>Y una sorpresa a\u00f1adida ha sido comprobar que su cerebro diminuto ten\u00eda al menos siete pares de surcos y era asombrosamente complejo para un primate tan antiguo.<\/p>\n\n\n\n<p>El\u00a0<em>Chilecebus<\/em>\u00a0es peque\u00f1ito pero contiene mucha informaci\u00f3n.<\/p>\n\n\n\n<p>Fuente: https:\/\/www.abc.es\/xlsemanal\/historia\/craneo-fosil-diminuto-ciencia-primates-teoria-evolucion.html<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un cr\u00e1neo diminuto y fosilizado\u00a0 encontrado en los Andes chilenos da un vuelco a la teor\u00eda de que las cabezas [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11418,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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