A new troodontid dinosaur from the Lower Cretaceous Yixian Formation of Liaoning Province, China
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A new troodontid dinosaur, Daliansaurus liaoningensis gen. et sp. nov., is erected based on a nearly complete specimen from the Lower Cretaceous Yixian Formation of Beipiao City, Liaoning Province, China. This well preserved skeleton provides important new details of the anatomy for Liaoning troodontids, and gives new insight into their phylogenetic relationships and evolution. Daliansaurus is distinguished from other troodontids by an enlarged ungual on pedal digit IV, which is approximately the same size as the sickle-shaped second ungual, and is differentiated from other Liaoning troodontids by a number of characters of the skull, manus, pelvis, and hindlimb. A phylogenetic analysis recovers Daliansaurus within a subclade of Liaoning troodontids that also includes Sinovenator, Sinusonasus, and Mei. We erect a name for this group—Sinovenatorinae—and argue that it reflects a localized radiation of small-bodied troodontids in the Early Cretaceous of eastern Asia, similar to previously recognized radiations of Liaoning dromaeosaurids and avialans. As more Liaoning theropods are discovered, it is becoming apparent that small, feathered paravians were particularly diverse during the Early Cretaceous, and future work is needed to clarify how this diversity arose, which species coexisted, and how these numerous species partitioned niches.
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The mid and distal caudals of Hesperornithoides have a longitudinal sulcus on the lateral surface where centra meet neural arches, which is primitive for paravians.
“The mid and distal caudals have a longitudinal sulcus on the lateral surface where centra meet neural arches, which is primitive for paravians, being present in unenlagiines, Liaoningvenator, archaeopterygids, and Jeholornis”
From A new paravian dinosaur from the Late Jurassic of North America supports a late acquisition of avian flight (2019) · cites this paper as Shen et al., 2017a
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- Authors
- SHEN, C., LÜ, J., LIU, S., KUNDRÁT, M., BRUSATTE, S. L., & GAO, H.
- Affiliations
- Chinese Academy of Geological Sciences (CN)
- Dalian Natural History Museum; Dalian Liaoning 116023 China
- University of Pavol Jozef Šafárik (SK)
- University of Edinburgh (GB)
- Corresponding author
- SHEN, Caizhi
- Venue
- Acta Geologica Sinica - English Edition
- Publisher
- Wiley
- Published
- 2017-06
- Volume
- 91
- Issue
- 3
- Pages
- 763-780
- ISSN
- 1000-9515 (ISSN-L)
- OpenAlex
- W2728300267
- Cited by
- 49
- References
- 63
- Citations by year
- 2026: 5 · 2025: 3 · 2024: 5 · 2023: 4 · 2022: 2 · 2021: 12 · 2020: 6 · 2019: 7 · 2018: 3 · 2017: 2
- FWCI
- 3.51
- Type
- journal article
- Language
- en
- Open access
- Licence
- Locations
- Acta Geologica Sinica - English Edition (publishedVersion)
- Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, other-oa)
- Funders
- National Natural Science Foundation of China (41272022)
- China Geological Survey
- Chinese Academy of Geological Sciences (JB1504)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
- Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Fossil Insects in Amber
- Keywords
- Yixian Formation, Lower Cretaceous, MEI, phylogenetic relationships, feathered dinosaurs, new genus and species, dromaeosaurids
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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