2005-03-10

    ¿El homínido bípedo más antiguo?

    El pasado 4 de Marzo Yohannes Haile-Selassie (en la foto) y colaboradores anunciaron el descubrimiento de unos huesos fósiles de homínidos de hace 3.8-4 millones de años. Es demasiado pronto para saber de qué especie se trata, aunque se especula con Australopithecus anamensis. Uno de los individuos encontrados* era más alto que 'Lucy', aunque no sé exáctamente cuánto ni si ya han determinado el sexo del indiviuduo. Tendremos que esperar cosa de un año para saber más detalles.

    Pero hay otros que no tienen paciencia y como son periodistas, tienen que dar noticias aunque sean inventadas. Así, a partir de estas declaraciones
    "Se trata del bípedo más antiguo del mundo", dijo Bruce Latimer, especialista del Museo de Historia Natural de Cleveland, Ohio, EE.UU., quien realizó el descubrimiento junto con su colega etíope Yohannes Haile-Selassie.
    la prensa hace de coro de papagayos y sueltan titulares como los que podéis leer aquí. El bípedo más antiguo del mundo ha sido hallado. Al menos algunos se molestan en decir homínido o humano en el titular. Otros en cambio apuestan aún más fuerte y dicen que es el homínido más antiguo que se haya encontrado.

    Pues nada de eso.
    Bipedalism is a crucial aspect of the human form, palaeoanthropologists believe - but there is a great deal of debate about when exactly this ability first arose in our lineage.

    There is some evidence that much older hominids could walk upright.

    Foot bones from the species Ardipithecus ramidus and Ardipithecus kadabba have features diagnostic of bipedalism.

    And recent computed tomography (CT) scans of the thighbone of a six-million-year-old Kenyan creature known as Orrorin tugenensis suggest it might have had quite a human gait.

    And a seven-million-year-old hominid from Chad, known as Sahelanthropus tchadensis and nicknamed Toumai, may also have been bipedal. The assessment is based on an analysis of where the animal's spine would have entered the skull and the position of muscle attachments on its head.
    Esto es un buen artículo de periodismo científico y lo demás son tonterías. Aunque uno de los descubridores dice que es el bípedo más antiguo, el bueno del periodista conoce su trabajo y busca información adicional, y vaya si la encuentra: las dos especies de Ardipithecus, así como los "viejos" Orrorin y 'Toumai', de hace 6 y 7 millones de años, respectivamente (curiosamente, el cráneo de uno de estos dos ha servido para ilustrar alguna de las noticiasPues va a ser que no era de uno de estos dos, sino de otro controvertido fósil encontrado no hace mucho; ver comentarios). Por supuesto que hay dudas acerca de su posición filogenética en el árbol homínido y sobre sus habilidades locomotoras, pero desde luego la cosa no está tan clara como le gustaría a Latimer.

    O quizá ellos lo tengan también muy claro, pero necesiten atraer atención para conseguir más financiación para seguir las excavaciones en Diciembre, que seguro.

    * han encontrado 12 especímenes de hueso fósil; lo primero es averiguar el número de individuos, cosa que no queda clara. Además hay más huesos pendientes de ser desenterrados.

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