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Comentario sobre "La ultrastructura revela el esqueleto faríngeo ancestral de los vertebrados en los yunnanozoos"
Xi-Guang Zhang1, Brian R Pratt2
1Institute of Paleontology, Yunnan University (Chenggong Campus), Kunming 650500, China.
Science (New York, N.Y.)
|July 27, 2023
Resumen
El análisis microscópico de los fósiles del Cámbrico sugiere una posible contaminación, desafiando las afirmaciones evolutivas de los vertebrados. Se necesitan más investigaciones para verificar el origen de las microestructuras observadas en animales yunnanozoos.
Área de la Ciencia:
- Paleontología
- Biología evolutiva
- La bioquímica
Sus antecedentes:
- El vínculo evolutivo entre los animales del Cámbrico y los vertebrados es un área clave de investigación.
- Tian y otros. propuso que los yunnanozoos son vertebrados del tallo basados en el análisis microstructural.
Objetivo del estudio:
- Reevaluar la interpretación del tejido microfibrilar en los arcos branquiales de los yunnanozoos del Cámbrico.
- Investigar el potencial de la contaminación orgánica moderna en los tejidos fosilizados.
Principales métodos:
- Técnicas de imágenes a escala nanométrica.
- Análisis químico de los residuos orgánicos.
- Análisis comparativo con tejidos biológicos modernos y contaminantes potenciales.
Principales resultados:
- Las "microfibras" observadas en los arcos branquiales de los yunnanozoos pueden no ser material biológico original.
- La evidencia sugiere que estas estructuras son consistentes con la contaminación orgánica moderna.
Conclusiones:
- La afirmación de que los yunnanozoos son vertebrados del tallo, basada en esta evidencia de microestructura, requiere un nuevo examen.
- La presencia de contaminación desafía las interpretaciones anteriores de la histología y la evolución de los primeros animales.
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