ArticleProceedings. Biological sciences2022
Fossil basicranium clarifies the origin of the avian central nervous system and inner ear.
Article in Proceedings. Biological sciences, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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10 citing papers in PubMed.
- Insights into the early evolution of modern avian physiology from fossilized soft tissues from the Mesozoic.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025Review
- Whence the birds: 200 years of dinosaurs, avian antecedents.Biology letters · 2025Review
- Article
- Endocranial development in non-avian dinosaurs reveals an ontogenetic brain trajectory distinct from extant archosaurs.Nature communications · 2024Article
- Article
- Macroevolutionary drivers of morphological disparity in the avian quadrate.Proceedings. Biological sciences · 2024Article
- Tip dating and Bayes factors provide insight into the divergences of crown bird clades across the end-Cretaceous mass extinction.Proceedings. Biological sciences · 2024Article
- New enantiornithine diversity in the Hell Creek Formation and the functional morphology of the avisaurid tarsometatarsus.PloS one · 2024Article
- Neuroanatomy of the crocodylian Tomistoma dowsoni from the Miocene of North Africa provides insights into the evolutionary history of gavialoids.Journal of anatomy · 2023Article
- Fossil basicranium clarifies the origin of the avian central nervous system and inner ear.Proceedings. Biological sciences · 2022Article
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5 authors.
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Abstract
Among terrestrial vertebrates, only crown birds (Neornithes) rival mammals in terms of relative brain size and behavioural complexity. Relatedly, the anatomy of the avian central nervous system and associated sensory structures, such as the vestibular system of the inner ear, are highly modified with respect to those of other extant reptile lineages. However, a dearth of three-dimensional Mesozoic fossils has limited our knowledge of the origins of the distinctive endocranial structures of crown birds. Traits such as an expanded, flexed brain, a ventral connection between the brain and spinal column, and a modified vestibular system have been regarded as exclusive to Neornithes. Here, we demonstrate all of these 'advanced' traits in an undistorted braincase from an Upper Cretaceous enantiornithine bonebed in southeastern Brazil. Our discovery suggests that these crown bird-like endocranial traits may have originated prior to the split between Enantiornithes and the more crownward portion of avian phylogeny over 140 Ma, while coexisting with a remarkably plesiomorphic cranial base and posterior palate region. Altogether, our results support the interpretation that the distinctive endocranial morphologies of crown birds and their Mesozoic relatives are affected by complex trade-offs between spatial constraints during development.
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