ArticlePloS one2023
A new alvarezsaurid dinosaur (Theropoda, Alvarezsauria) from the Upper Cretaceous Baruungoyot Formation of Mongolia provides insights for bird-like sleeping behavior in non-avian dinosaurs.
Article in PloS one, 2023. 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, 20 citations in OpenAlex.
- Cenomanian theropod teeth from Algora (central Spain), new evidence for majungasaurine abelisaurids in Europe.Scientific reports · 2026Article
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- Didactyl therizinosaur with a preserved keratinous claw from the Late Cretaceous of Mongolia.iScience · 2025Article
- Forelimb reduction and digit loss were evolutionarily decoupled in oviraptorosaurian theropod dinosaurs.Royal Society open science · 2025Article
- Body size and evolutionary rate analyses reveal complex evolutionary history of Alvarezsauria.Cladistics : the international journal of the Willi Hennig Society · 2025Article
- Cursorial ecomorphology and temporal patterns in theropod dinosaur evolution during the mid-Cretaceous.Royal Society open science · 2025Article
- Article
- Early Cretaceous troodontine troodontid (Dinosauria: Theropoda) from the Ohyamashimo Formation of Japan reveals the early evolution of Troodontinae.Scientific reports · 2024Article
- Shed teeth from Portezuelo formation at Sierra del Portezuelo reveal a higher diversity of predator theropods during Turonian-Coniacian times in northern Patagonia.BMC ecology and evolution · 2024Article
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4 authors at 2 institutions in 3 countries.
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No grant is acknowledged in the PubMed record.
Abstract
Alvarezsauria is a group of early-branching maniraptoran theropods that are distributed globally from the Late Jurassic to the latest Cretaceous. Despite recent increases in the fossil record of this group, the scarcity of complete specimens still restricts interpreting their detailed anatomy, ecology, and evolution. Here, we report a new taxon of derived alvarezsaur, Jaculinykus yaruui gen. et sp. nov., from the Late Cretaceous of Mongolia, which represents a nearly complete and articulated skeleton. Our phylogenetic analysis reveals that Jaculinykus belongs to the sub-clade of Alvarezsauridae, Parvicursorinae, and forms a mononphyletic group with Mononykus and Shuvuuia. Its well-preserved manus has only two fingers, composed of a hypertrophied digit I and greatly reduced digit II, which implies an intermediate condition between the tridactyl manus of Shuvuuia and monodactyl manus of Linhenykus. This highlights a previously unrecognized variation in specialization of alvarezsaurid manus. Notably, the preserved posture of the specimen exhibits a stereotypical avian-like sleeping position seen in the troodontids Mei and Sinornithoides. Evidence of this behavior in the alvarezsaur Jaculinykus suggests that stereotypically avian sleeping postures are a maniraptoran synapomorphy, providing more evidence of bird-like traits being distributed broadly among avian ancestors.
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