La pelvis y el fémur de Ardipithecus ramidus: el surgimiento de la marcha erguida
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C Owen Lovejoy1, Gen Suwa, Linda Spurlock
1Department of Anthropology, School of Biomedical Sciences, Kent State University, Kent, OH 44242-0001, USA. olovejoy@aol.com
Science (New York, N.Y.)
|October 8, 2009
Resumen
Ardipithecus ramidus exhibió una caminata bípeda primitiva y adaptaciones arborícolas. Sus características únicas pélvicas y espinales sugieren que la locomoción de los primeros homínidos evolucionó poco después de divergir de los antepasados de los chimpancés.
Área de la Ciencia:
- La paleoantropología es la paleoantropología.
- Anatomía de los Primates La anatomía de los primates
- Biología evolutiva Biología evolutiva.
Sus antecedentes:
- La evolución del bipedalismo en los primeros homínidos es un área clave de investigación.
- Comprender la locomoción de Ardipithecus ramidus proporciona información sobre las primeras etapas de la evolución humana.
- La anatomía comparativa de los homínidos fósiles y los primates existentes es crucial para reconstruir los comportamientos ancestrales.
Objetivo del estudio:
- Para analizar las características esqueléticas de Ardipithecus ramidus, específicamente el fémur y la pelvis.
- Determinar las capacidades locomotoras de Ardipithecus ramidus, incluyendo el bipedalismo y el movimiento arbóreo.
- Para comparar las adaptaciones de Ardipithecus ramidus con las de otros simios y homínidos fósiles y existentes.
Principales métodos:
- Análisis anatómico comparativo del fémur y la pelvis de Ardipithecus ramidus.
- Examen de las características clave como la morfología del ilio, la posición de la articulación sacroilíaca y la curvatura de la columna vertebral.
- Comparación con datos de esqueletos de monos, simios del Mioceno temprano, medio y tardío, simios africanos y homínidos posteriores.
Principales resultados:
- Ardipithecus ramidus poseía un mosaico de rasgos tanto para el caminar bípedo vertical como para la locomoción arbórea.
- El ilio de Ardipithecus ramidus estaba mediolateralmente expandido con una articulación sacroiliaca posteriormente ubicada, similar a algunos simios y homínidos posteriores.
- La bipedalidad en Ardipithecus ramidus se caracterizaba por un ilio craniocaudal acortado y una lordosis lumbar mejorada, distinta de los simios existentes.
Conclusiones:
- La bipedalidad en Ardipithecus ramidus fue más primitiva que en Australopithecus.
- Las adaptaciones únicas para la bipedalidad probablemente evolucionaron poco después de la divergencia del último antepasado común con los chimpancés.
- Estas primeras adaptaciones para la bipedalidad tienen una relación funcional mínima con la locomoción especializada de los simios africanos existentes.
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