ArticleScientific reports2017
A new tyrannosaur with evidence for anagenesis and crocodile-like facial sensory system.
Article in Scientific reports, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 37 papers.
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37 citing papers in PubMed.
- A new megaraptoran dinosaur from the Lower Cretaceous Wessex Formation, UK, and its implications for theropod evolution and biogeography.Royal Society open science · 2026Article
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- Synapsids and sensitivity: Broad survey of tetrapod trigeminal canal morphology supports an evolutionary trend of increasing facial tactile specialization in the mammal lineage.Anatomical record (Hoboken, N.J. : 2007) · 2026Article
- A large tyrannosaurid from the Late Cretaceous (Campanian) of North America.Scientific reports · 2026Article
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- Rise of the king: Gondwanan origins and evolution of megaraptoran dinosaurs.Royal Society open science · 2025Article
- Morphological evolution and functional consequences of giantism in tyrannosauroid dinosaurs.iScience · 2024Article
- The first deep-snouted tyrannosaur from Upper Cretaceous Ganzhou City of southeastern China.Scientific reports · 2024Article
- The coevolution of rostral keratin and tooth distribution in dinosaurs.Proceedings. Biological sciences · 2024Article
- A giant tyrannosaur from the Campanian-Maastrichtian of southern North America and the evolution of tyrannosaurid gigantism.Scientific reports · 2024Article
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- Exceptionally preserved stomach contents of a young tyrannosaurid reveal an ontogenetic dietary shift in an iconic extinct predator.Science advances · 2023Article
- Ecomorphological patterns in trigeminal canal branching among sauropsids reveal sensory shift in suchians.Journal of anatomy · 2023Article
- Calibrating the zenith of dinosaur diversity in the Campanian of the Western Interior Basin by CA-ID-TIMS U-Pb geochronology.Scientific reports · 2022Article
- An exceptional neurovascular system in abelisaurid theropod skull: New evidence from Skorpiovenator bustingorryi.Journal of anatomy · 2022Article
- The first occurrence of an avian-style respiratory infection in a non-avian dinosaur.Scientific reports · 2022Article
- A transitional species ofPeerJ · 2022Article
- A new carcharodontosaurian theropod dinosaur occupies apex predator niche in the early Late Cretaceous of Uzbekistan.Royal Society open science · 2021Article
- Dinosaurs from the Santonian-Campanian Atlantic coastline substantiate phylogenetic signatures of vicariance in Cretaceous North America.Royal Society open science · 2021Article
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5 authors.
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Abstract
A new species of tyrannosaurid from the upper Two Medicine Formation of Montana supports the presence of a Laramidian anagenetic (ancestor-descendant) lineage of Late Cretaceous tyrannosaurids. In concert with other anagenetic lineages of dinosaurs from the same time and place, this suggests that anagenesis could have been a widespread mechanism generating species diversity amongst dinosaurs, and perhaps beyond. We studied the excellent fossil record of the tyrannosaurid to test that hypothesis. Phylogenetic analysis places this new taxon as the sister species to Daspletosaurus torosus. However, given their close phylogenetic relationship, geographic proximity, and temporal succession, where D. torosus (~76.7-75.2 Ma) precedes the younger new species (~75.1-74.4 Ma), we argue that the two forms most likely represent a single anagenetic lineage. Daspletosaurus was an important apex predator in the late Campanian dinosaur faunas of Laramidia; its absence from later units indicates it was extinct before Tyrannosaurus rex dispersed into Laramidia from Asia. In addition to its evolutionary implications, the texture of the facial bones of the new taxon, and other derived tyrannosauroids, indicates a scaly integument with high tactile sensitivity. Most significantly, the lower jaw shows evidence for neurovasculature that is also seen in birds.
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