Tyrannomimus (meaning "tyrant mimic") is an extinct genus of ornithomimosaurian theropod dinosaurs from the Kitadani Formation of Japan. The type species is Tyrannomimus fukuiensis.[1]
| Tyrannomimus Temporal range: Early Cretaceous,
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| Diagram of known fossil material | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Clade: | †Ornithomimosauria |
| Family: | †Deinocheiridae |
| Genus: | †Tyrannomimus Hattori et al., 2023 |
| Species: | †T. fukuiensis
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| Binomial name | |
| †Tyrannomimus fukuiensis Hattori et al., 2023
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Discovery and naming
edit
Tyrannomimus is based on the holotype FPDM-V-11311, a partial postrcranial skeleton. Multiple referred specimens are also known.
They were named as a new genus and species of ornithomimosaur in 2023. The generic name, "Tyrannomimus", is a reference to its morphological similarities with tyrannosauroids, particularly the vertical ridge of the ilium previously believed to be a synapomorphy of that clade and shared with Aviatyrannis. The specific name, "fukuiensis", refers to Fukui Prefecture where the fossils were found.[1]
Classification
editTyrannomimus was entered in a phylogenetic analysis by Hattori et al. (2023) and placed within the family Deinocheiridae, as the sister taxon to Harpymimus. Their cladogram is shown below:[1]
| Ornithomimosauria |
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Although it wasn't included in the dataset, Hattori et al. also consider Aviatyrannis to be a basal ornithomimosaur due to its similarities with Tyrannomimus.[1]
Paleoenvironment
editTyrannomimus lived alongside a diverse assemblage of animals, most of which are named after Fukui Prefecture. These include the sauropod Fukuititan, the ornithopods Fukuisaurus and Koshisaurus, and the theropods Fukuiraptor, Fukuivenator, and Fukuipteryx.[2][3][4]
References
edit- ^ a b c d Hattori, S.; Shibata, M.; Kawabe, S.; Imai, T.; Nishi, H.; Azuma, Y. (2023). "New theropod dinosaur from the Lower Cretaceous of Japan provides critical implications for the early evolution of ornithomimosaurs". Scientific Reports. 13. 13842. doi:10.1038/s41598-023-40804-3. PMC 10484975.
- ^ Azuma, Y.; Shibata, M. (2010). "Fukuititan nipponensis, a new titanosauriform sauropod from the Early Cretaceous Tetori Group of Fukui Prefecture, Japan". Acta Geologica Sinica - English Edition. 84 (3): 454–462. doi:10.1111/j.1755-6724.2010.00268.x.
- ^ Shibaba, Masateru; Azuma, Yoichi (2015). "New basal hadrosauroid (Dinosauria: Ornithopoda) from the Lower Cretaceous Kitadani Formation, Fukui, central Japan" (PDF). Zootaxa. 3914 (4): 421–440. doi:10.11646/zootaxa.3914.4.3. PMID 25661952.|
- ^ Imai, T., Azuma, Y., Kawabe, S., Shibata, M., Miyata, K., Wang, M., & Zhou, Z. (2019). An unusual bird (Theropoda, Avialae) from the Early Cretaceous of Japan suggests complex evolutionary history of basal birds. Communications Biology, 2(1). doi: 10.1038/s42003-019-0639-4
