Daspletosaurini
| Daspletosaurins Temporal range: Late Cretaceous, middle Campanian
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|---|---|
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| Skeletal mount of Daspletosaurus torosus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Family: | †Tyrannosauridae |
| Subfamily: | †Tyrannosaurinae |
| Tribe: | †Daspletosaurini Voris et al., 2020 |
| Type species | |
| Daspletosaurus torosus Russell, 1970
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| Genera | |
Daspletosaurini were an extinct tribe of tyrannosaurine dinosaurs that lived in Laramidia during the Middle Campanian age. It comprised the two genera Daspletosaurus and Thanatotheristes. There are at least four species described in the two genera, were at one point all of them were assigned as specimens of D. torosus, several papers since 2017 have found there to be several species. These studies found an anagenesis in the group, whether contained in a daspletosaurin clade or paraphyletic in respect to the linage of tyrannosaurines leading up to Tyrannosaurus.[1][2][3]
Daspletosaurini is diagnosed by the following characteristics such as the presence of an extremely coarse subcutaneous surface of the maxilla anteroventral to the antorbital fossa; a constricted jugal ramus of maxilla; the anteroventral corner of the maxilla tapers into a shallow angle (<65°) as measured between the alveolar margin of the first two alveoli and the anterior margin of the subcutaneous surface. A prefrontal that is broad in dorsal view and strongly dorsomedially arced in anterior view; a dentary chin located ventral to either the third alveolus or third interdental plate and possessing no fewer than 14 maxillary teeth.[2]
References
- ^ Carr, Thomas D.; Varricchio, David J.; Sedlmayr, Jayc C.; Roberts, Eric M.; Moore, Jason R. (2017). "A new tyrannosaur with evidence for anagenesis and crocodile-like facial sensory system". Scientific Reports. 7: 44942. Bibcode:2017NatSR...744942C. doi:10.1038/srep44942. PMC 5372470. PMID 28358353.
- ^ a b Voris, Jared T.; Therrien, Francois; Zelenitzky, Darla K.; Brown, Caleb M. (2020). "A new tyrannosaurine (Theropoda: Tyrannosauridae) from the Campanian Foremost Formation of Alberta, Canada, provides insight into the evolution and biogeography of tyrannosaurids". Cretaceous Research. 110: 104388. doi:10.1016/j.cretres.2020.104388. S2CID 213838772.
- ^ Warshaw, Elías A.; Fowler, Denver W. (2022). "A transitional species of Daspletosaurus Russell, 1970 from the Judith River Formation of eastern Montana". PeerJ. 10. e14461. doi:10.7717/peerj.14461.
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