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Dissection, MicroCT Scanning and Morphometric Analyses of the Baculum
Published on: March 19, 2017
Anatomía craneal y implicaciones de Dolichocebus, un primate ceboide del Oligoceno tardío
Nature
|May 31, 1979
Resumen
El fósil del primate Dolichocebus gaimanesis sugiere que el linaje Saimiri es el linaje primate más antiguo conocido, que data de hace 25 millones de años. Este hallazgo indica que las principales divisiones de platirrinos se establecieron a finales del Oligoceno.
Área de la Ciencia:
- Paleoprimatología Paleoprimatología
- Mammalogía Neotrópica de los Mamíferos
- Evolución de los Primates Evolución de los Primates
Sus antecedentes:
- El registro fósil de los monos del Nuevo Mundo del Cenozoico es escaso, lo que limita la comprensión de la historia de los primates platirrinos.
- Los fósiles existentes como Neosaimiri, Stirtonia y Cebupithecia ofrecen algunas ideas, pero se han debatido las afinidades.
- Los primates platirrinos son componentes significativos de la fauna de mamíferos neotrópicos y de la diversidad de primates pantrópicos.
Objetivo del estudio:
- Para investigar las implicaciones evolutivas del fósil terminal del Oligoceno Dolichocebus gaimanesis de la Patagonia.
- Para establecer la posición filogenética de Dolichocebus gaimanesis dentro de los primates platirrinos.
- Para inferir el momento de la divergencia para las principales divisiones de Ceboidea basado en evidencia fósil.
Principales métodos:
- Análisis morfológico del cráneo casi completo de Dolichocebus gaimanesis.
- Anatomía comparativa para determinar las interrelaciones con otros taxones platirrinos.
- Inferencia filogenética basada en marcos evolutivos de primates establecidos.
Principales resultados:
- Se sugiere fuertemente que Dolichocebus gaimanesis sea un miembro del linaje Saimiri.
- Esta identificación establece el linaje Saimiri como el linaje de primates más antiguo conocido, originado hace aproximadamente 25 millones de años.
- Los hallazgos implican que las dos principales divisiones monofiléticas de Ceboidea ya estaban establecidas a finales del Oligoceno.
Conclusiones:
- La gaimanesis de Dolichocebus proporciona evidencia crucial para la evolución temprana de los primates platirrinos.
- Los antiguos orígenes del linaje Saimiri resaltan la profunda historia evolutiva de los monos del Nuevo Mundo.
- Las principales divergencias de infraorden de primates se produjeron antes de lo sugerido anteriormente por el registro fósil.
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