Description and osteohistology of two early immature enantiornithines (Aves: Ornithothoraces) from the Early Cretaceous Jehol Biota
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Archaeopteryx had a lower metabolic rate than crown birds.
“The phylogenetic position of Archaeopteryx indicates that it was warm-blooded but it can be inferred to have had a lower metabolic rate than crown birds based on the slower deposition of bone tissue in Archaeopteryx and other early-diverging Cretaceous birds compared to a subset of ornithuromorphs that includes Neornithes with uninterrupted growth [37, 106].”
From The ecology of Archaeopteryx (2026) · cites this paper as [106]
Archaeopteryx was warm-blooded.
“The phylogenetic position of Archaeopteryx indicates that it was warm-blooded but it can be inferred to have had a lower metabolic rate than crown birds based on the slower deposition of bone tissue in Archaeopteryx and other early-diverging Cretaceous birds compared to a subset of ornithuromorphs that includes Neornithes with uninterrupted growth [37, 106].”
From The ecology of Archaeopteryx (2026) · cites this paper as [106]
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Osteohistology of Enantiornithine Birds from the Lower Cretaceous Xiagou Formation
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- Authors
- O’Connor, J. K., Atterholt, J., Bailleul, A. M., Wang, M., Kuo, P.-C., & Zhou, Z.
- Affiliations
- Western University of Health Sciences (US)
- Chinese Academy of Sciences (CN)
- Field Museum of Natural History (US)
- Venue
- Geobios
- Publisher
- Elsevier BV
- Published
- 2025-06
- Volume
- 90
- Pages
- 103-122
- ISSN
- 0016-6995 (ISSN-L)
- OpenAlex
- W4401351546
- Cited by
- 6
- References
- 75
- Citations by year
- 2026: 3 · 2025: 3
- FWCI
- 1.89
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Geobios (publishedVersion)
- Funders
- National Natural Science Foundation of China (41688103, 42288201)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
- Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Fossil Insects in Amber
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
- Keywords
- Enantiornithes, immature birds, bone histology, ontogeny, Jehol Biota, Early Cretaceous birds, bone formation, cortical thickness, growth lines, developmental plasticity, altriciality, humerus, tibia
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