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El período ediacariano y el sistema: los metazoos heredan la Tierra
Resumen
El período Ediacariano, de hace 670 a 550 millones de años, muestra la vida animal multicelular más antigua conocida. Esta era vio la aparición global de una biota única, preparando el escenario para la diversificación de las principales filas animales.
Área de la Ciencia:
- Paleontología Paleontología.
- Geología Geología Geología.
- Biología evolutiva Biología evolutiva.
Sus antecedentes:
- El período Ediacariano marca el comienzo del Eón Fanerozoico.
- Se define por la presencia de la vida animal multicelular más antigua conocida.
- Esta biota única apareció globalmente después de la glaciación proterozoica terminal.
Objetivo del estudio:
- Para definir el período de Ediacaran y su conjunto biotal asociado.
- Comprender la línea de tiempo y la distribución global de la vida multicelular temprana.
- Para contextualizar la vida Ediacaran dentro de la diversificación más amplia de los filos metazoanos.
Principales métodos:
- Datación geológica para establecer el marco de tiempo Ediacaran (670-550 millones de años atrás).
- Análisis paleontológico de metazoos fosilizados (animales desnudos) y restos fósiles.
- Reconstrucción paleogeográfica para determinar la distribución de la biota ediacarana en las bajas paleolatitudes.
Principales resultados:
- La biota ediacarana incluye 26 especies en 18 géneros en más de 4 filos, junto con sencillas huellas superficiales.
- Este conjunto distintivo se encontró en todo el mundo en regiones de baja paleolatitud.
- El intervalo de Ediacaran, junto con el Cámbrico Temprano, fue crucial para la diversificación de la vida metazoaria.
Conclusiones:
- El período Ediacaran representa un momento crucial para el origen y la evolución temprana de la vida animal.
- La distribución global de la biota de Ediacaran pone de relieve la interconexión temprana de los ecosistemas marinos.
- Este período sentó las bases para la posterior irradiación de clases y órdenes de invertebrados en el Cámbrico.
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