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VeRteBRate PaleONtOlOGY A diminutive tyrannosaur lived alongside Tyrannosaurus rex Christopher T. Griffin1,2,3*, Jeb Bugos4, Ashley W. Poust5, Zachary S. Morris6, Riley S. Sombathy7,8,9, Michael D. D’Emic9, Patrick M. O’Connor7,10,11, Holger Petermann11, Matteo Fabbri12, Caitlin Colleary4 Whether Nanotyrannus lancensis represents a distinct taxon or an immature Tyrannosaurus rex is a decades- long controversy. The N. lancensis holotype (CMnH 7541) is an isolated skull and ceratobranchials, but limb osteohistology of Nanotyrannus- like individuals implies that these individuals were immature Tyrannosaurus, suggesting that the N. lancensis holotype is also immature. We demonstrate that ceratobranchial (“hyoid”) histology is useful for ontogenetic assessment in extant and extinct archosaurs. The ceratobranchial histology of the N. …
摘自《科学》(Science)第391卷 第6782期 · 2026年1月15日。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。