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Homo erectus calvarium desde el Pleistoceno de Java
Hisao Baba1, Fachroel Aziz, Yousuke Kaifu
1Department of Anthropology, National Science Museum, Hyakunincho, Shinjuku-ku, Tokyo 169-0073, Japan. baba@kahaku.go.jp
Science (New York, N.Y.)
|March 1, 2003
Resumen
El fósil de Homo erectus Sambungmacan 4 muestra una flexión de la base craneal parecida a la del hombre moderno, lo que sugiere que la globularidad craneal evolucionó de forma independiente. Este hallazgo apoya la contribución limitada del Homo erectus javanés a la ascendencia humana moderna.
Área de la Ciencia:
- La paleoantropología es la paleoantropología.
- Evolución del ser humano Evolución del ser humano
- Paleontología Paleontología.
Sus antecedentes:
- La historia evolutiva del Homo erectus proporciona información sobre los orígenes humanos.
- Comprender los cambios en la morfología craneal es clave para rastrear el linaje humano.
- El registro fósil del Homo erectus javanés ofrece una ventana única a las últimas etapas de la evolución de H. erectus.
Objetivo del estudio:
- Para analizar la morfología craneal del Sambungmacan 4 (Sm 4) Homo erectus calvarium.
- Para investigar la relación entre la flexión de la base craneal y la forma de la bóveda craneal en el Homo erectus.
- Evaluar la posición filogenética de Sm 4 dentro del linaje de Homo erectus y su contribución a la ascendencia humana moderna.
Principales métodos:
- Recuperación del calvario del Homo erectus (Sm 4) de los sedimentos del Pleistoceno.
- Análisis por tomografía microcomputada (TC) del calvario Sm 4.
- Análisis morfológico comparativo con otros fósiles de Homo erectus y humanos modernos.
Principales resultados:
- El calvario Sm 4 exhibe una flexión de la base craneal moderna similar a la humana.
- Se observó una bóveda platicéfala (planta) baja junto con la flexión de la base craneal.
- La morfología de Sm 4 es intermedia entre el Homo erectus javanés anterior y posterior, con especímenes posteriores que muestran características más especializadas.
Conclusiones:
- La globularidad craneal en la evolución humana probablemente evolucionó independientemente de la flexión de la base craneal.
- La distinción morfológica del posterior Homo erectus javanés sugiere el aislamiento de la población.
- Posteriormente, las poblaciones de Homo erectus del Pleistoceno javanés contribuyeron mínimamente a la ascendencia de los humanos modernos.
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