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Animales triploblásticos hace más de mil millones de años: rastro de evidencia fósil de la India
1A. Seilacher, Geologisch-Palaontologisches Institut der Universitat, 72076 Tubingen, Germany, and Department of Geology and Geophysics, Yale University, Box 208109, New Haven, CT 06520, USA. P. K. Bose, Department of Geological Scie.
Science (New York, N.Y.)
|October 2, 1998
Resumen
Las madrigueras fosilizadas en la arenisca antigua sugieren que la vida animal compleja, específicamente los mineros de matriz inferior parecidos a gusanos, existió hace más de mil millones de años. Esto indica un ritmo lento de la evolución animal antes de la explosión del Cámbrico.
Área de la Ciencia:
- Paleontología Paleontología.
- Biología evolutiva Biología evolutiva.
- Geología sedimentaria Geología sedimentaria
Sus antecedentes:
- La era mesoproterozoica es anterior a la explosión cámbrica, un período de rápida diversificación de los animales.
- La comprensión de la vida animal temprana requiere el análisis de restos fósiles y formaciones rocosas sedimentarias.
Objetivo del estudio:
- Para investigar las intrigantes características del plano de lecho en la arenisca mesoproterozoica Chorhat.
- Interpretar estas características como evidencia potencial del comportamiento y la existencia de los primeros animales.
Principales métodos:
- Examen geológico de las características del plano de lecho dentro de la piedra arenisca de Chorhat.
- Interpretación de estas características como madrigueras biológicas basadas en la morfología y el contexto.
Principales resultados:
- Las características del plano de lecho observadas se interpretan como madrigueras biológicas.
- Estas madrigueras se atribuyen a mineros de submatas parecidos a gusanos (animales infaunales).
- Los hallazgos sugieren la existencia de animales triploblásticos hace más de mil millones de años.
Conclusiones:
- El descubrimiento proporciona evidencia de la vida animal temprana que precede al período cámbrico.
- La diversificación del diseño animal parece haber sido un proceso lento antes de la evolución de los esqueletos duros.
- Estos hallazgos ofrecen información sobre el ritmo de la evolución anterior a los principales cambios ecológicos y la explosión cámbrica.
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