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Un dinosaurio de cuello largo de una cuenca recién descubierta del Triásico Superior en los Andes
E Martín Hechenleitner1,2, Agustín G Martinelli3,4,5, Sebastián Rocher6,7
1Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina. emhechenleitner@gmail.com.
Nature
|October 15, 2025
Resumen
Un nuevo dinosaurio sauropodomorfo, el Huayracursor jaguensis, fue descubierto en Argentina
Área de la Ciencia:
- Paleontología
- Evolución de los vertebrados
- Ecosistemas del Triásico
Sus antecedentes:
- Los ecosistemas terrestres del Triásico tardío experimentaron cambios significativos, que influyeron en la diversificación de los principales clados de vertebrados.
- Los descubrimientos fósiles clave anteriores relacionados con la evolución temprana de los dinosaurios se concentraron en cuencas específicas de América del Sur.
- La cuenca de la Precordillera del Norte en Argentina no fue reconocida previamente por su importancia paleontológica.
Objetivo del estudio:
- Para reportar un recién descubierto grupo de tetrápodos de las Carnias de la cuenca de la Precordillera del Norte.
- Para describir el sauropodomorfo temprano Huayracursor jaguensis y sus implicaciones evolutivas.
- Para proporcionar información sobre las faunas de vertebrados del Triásico Tardío y las tendencias evolutivas.
Principales métodos:
- Excavación y análisis de un conjunto de tetrápodos de Carnia en el yacimiento de Quebrada Santo Domingo.
- Análisis esquelético detallado del sauropodomorfo temprano Huayracursor jaguensis.
- Análisis comparativo con los sauropodomorfos conocidos de Carnia y Noria.
Principales resultados:
- Descubrimiento de Huayracursor jaguensis, un esqueleto casi completo de un sauropodomorfo temprano.
- Identificación de los componentes típicos de la fauna de Carnia tardía, incluidos los rincosaurios, los cinodontes y los aetosaurios.
- Huayracursor exhibe un aumento de la masa corporal y el alargamiento cervical incipiente, intermedio entre los sauropodomorfos de Carnia y Noria.
Conclusiones:
- El descubrimiento amplía el registro fósil conocido de tetrápodos carnios en América del Sur.
- Huayracursor jaguensis representa evidencia significativa de aumentos tempranos en el tamaño del cuerpo y la longitud del cuello en la evolución sauropodomorfa.
- Este hallazgo contribuye a comprender la diversificación de los dinosaurios durante el Triásico Tardío.
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