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Updated: Jan 20, 2026

The Evidence for Evolution and Common Ancestor

The Evidence for Evolution and Common Ancestor

La marcha de la muerte de un bilatérico segmentado y trilobado aclara la evolución animal temprana

Zhe Chen^1,2, Chuanming Zhou^2,3, Xunlai Yuan^4,5,6

¹State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China.

|September 6, 2019

Resumen

El descubrimiento de fósiles revela Yilingia spiciformis, un antiguo bilatérico segmentado del período Ediacaran. Este hallazgo conecta los fósiles corporales con los fósiles traza, iluminando la motilidad y segmentación de los primeros animales.

Área de la Ciencia:

Paleontología
Biología evolutiva
Tecnología

Sus antecedentes:

El origen de la motilidad animal en los bilaterios fue un evento evolutivo clave en el período Ediacaran.
Abundan los restos fósiles (ichnofósil) de este período, pero los productores siguen siendo en gran parte no identificados.
Existe una brecha entre el fósil corporal y los registros fósiles de la biota de Ediacaran.

Objetivo del estudio:

Para identificar a los productores de los restos fósiles de Ediacaran.
Para describir un fósil de cuerpo bilateral recién descubierto del período Ediacaran terminal.
Proporcionar información sobre el origen de la motilidad bilateral y la segmentación.

Principales métodos:

Descripción y análisis de un fósil de cuerpo recién descubierto, Yilingia spiciformis.
Asociación del fósil del cuerpo con su rastro fósil (rastro) producido durante una marcha de la muerte.
Análisis comparativo de la morfología de Yilingia con grupos bilaterales conocidos.

Principales resultados:

Descubrimiento de Yilingia spiciformis, un bilaterio segmentado de hace 551-539 millones de años.
Yilingia exhibe unidades corporales trilobadas repetitivas que indican segmentación y polaridad.
El fósil se conserva con su rastro, que une directamente el cuerpo y los fósiles de rastro.

Conclusiones:

Yilingia spiciformis proporciona evidencia directa de los productores de algunos fósiles de trazas de Ediacaran.
Este descubrimiento arroja luz sobre los orígenes evolutivos de la segmentación en los bilaterales.
Yilingia ofrece información crucial sobre el desarrollo de la motilidad animal durante el período Ediacaran.

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