New Feathered Dinosaur Species Discovered from the Late Cretaceous Period

Greg Howard
15th June, 2024

New Feathered Dinosaur Species Discovered from the Late Cretaceous Period

The sacral and caudal vertebrae of Diuqin lechiguanae exhibit unique anatomical features, including paired foramina on the neural arches (a, c, f, h) and a horizontal accessory lamina in the last sacral vertebra (b), that distinguish it as a new dinosaur species.

Image adapted from: Porfiri et al. / CC BY (Source)

Key Findings

  • The study from Universidad Nacional del Comahue focuses on unenlagiine paravians, a group of theropod dinosaurs from Gondwana
  • Researchers found that unenlagiine paravians were more diverse and widespread than previously thought
  • The study provides new evidence supporting a unique Gondwanan lineage of dromaeosaurids, crucial for understanding the origin of birds
Understanding the evolutionary origins of birds has long fascinated scientists, especially the role played by their theropod dinosaur ancestors. One key group in this evolutionary puzzle is the unenlagiine paravians, a clade of theropod dinosaurs from the southern supercontinent Gondwana. However, the fossil record of unenlagiine paravians has been incomplete, with many species known only from fragmentary remains. This has made it challenging to piece together their evolutionary history and their connection to the origins of birds. Recent research from Universidad Nacional del Comahue aims to address this gap by providing new insights into the unenlagiine paravians[1]. The study from Universidad Nacional del Comahue focuses on the unenlagiine paravians, a group of theropod dinosaurs that are pivotal for understanding the early evolution of birds. The researchers aimed to fill the gaps in the fossil record and provide a clearer picture of how these dinosaurs evolved and their role in the origin of avian flight. Previous studies have highlighted the significance of theropods in the evolutionary history of birds. For instance, the evolutionary history of Maniraptora, the clade that includes birds and dromaeosaurids, has largely been constructed from fossils found in northern continents, especially in the Late Jurassic and Cretaceous periods[2]. The discovery of diverse maniraptorans in Early Cretaceous deposits in Liaoning, China, pushed back the origins of these lineages and suggested that they might have existed in Gondwana as well. However, the evidence from southern continents has been sparse and often incomplete. A more detailed understanding of the phylogeny of birds and their closest relatives has been provided by an automated analysis of the Theropod Working Group (TWiG) coelurosaurian phylogenetic data matrix. This analysis supported the grouping of dromaeosaurids and troodontids as the sister taxon to birds and suggested that there was greater experimentation with wing-assisted locomotion among early theropods than previously appreciated[3]. This finding is crucial as it hints at multiple origins of powered flight potential in theropods, indicating a complex evolutionary history. The new study builds on these previous findings by focusing on the unenlagiine paravians from Gondwana. One of the most significant contributions to this field has been the detailed description of Buitreraptor gonzalezorum, an unenlagiine dromaeosaurid from South America. This taxon is one of the best-represented Gondwanan dromaeosaurids and provides valuable anatomical information that has helped clarify the phylogenetic relationships within this group[4]. The researchers from Universidad Nacional del Comahue examined new fossil material and re-evaluated existing specimens to better understand the evolutionary history of unenlagiine paravians. They used a combination of detailed anatomical descriptions and phylogenetic analysis to place these dinosaurs within the broader context of theropod evolution. Their findings suggest that unenlagiine paravians were more diverse and widespread than previously thought, with a longer evolutionary history that predates the separation of northern and southern landmasses. This study provides new evidence that supports the idea of a unique Gondwanan lineage of dromaeosaurids, which has significant implications for our understanding of the origin of birds. By filling in the gaps in the fossil record, the researchers have helped to clarify the evolutionary relationships between different groups of theropods and provided new insights into the early stages of avian evolution. In summary, the research from Universidad Nacional del Comahue has made a substantial contribution to our understanding of the evolutionary history of unenlagiine paravians and their role in the origin of birds. By integrating new fossil evidence with detailed anatomical and phylogenetic analysis, this study has helped to fill in critical gaps in the fossil record and provided a clearer picture of the complex evolutionary history of these fascinating dinosaurs.

GeneticsAnimal ScienceEvolution

References

Main Study

1) Diuqin lechiguanae gen. et sp. nov., a new unenlagiine (Theropoda: Paraves) from the Bajo de la Carpa Formation (Neuquén Group, Upper Cretaceous) of Neuquén Province, Patagonia, Argentina

Published 14th June, 2024

https://doi.org/10.1186/s12862-024-02247-w

Related Studies

2) The earliest dromaeosaurid theropod from South America.

Journal: Nature, Issue: Vol 437, Issue 7061, Oct 2005

3) Potential for Powered Flight Neared by Most Close Avialan Relatives, but Few Crossed Its Thresholds.

https://doi.org/10.1016/j.cub.2020.06.105

4) Postcranial skeletal anatomy of the holotype and referred specimens of Buitreraptor gonzalezorum Makovicky, Apesteguía and Agnolín 2005 (Theropoda, Dromaeosauridae), from the Late Cretaceous of Patagonia.

https://doi.org/10.7717/peerj.4558


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