Iani Temporal range: Late Cretaceous (Cenomanian), ~ | |
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Skeletal reconstruction showing known fossil material in green | |
Scientific classification | |
Kingdom: | Animalia |
Phylum: | Chordata |
Clade: | Dinosauria |
Clade: | † Ornithischia |
Clade: | † Ornithopoda |
Clade: | † Rhabdodontomorpha |
Genus: | † Iani Zanno et al., 2023 |
Species: | †I. smithi |
Binomial name | |
†Iani smithi Zanno et al., 2023 | |
Iani (after Ianus) is an extinct genus of rhabdodontomorph iguanodontian dinosaur from the Late Cretaceous Cedar Mountain Formation of Utah, United States. The genus contains a single species, I. smithi, known from a partial skeleton including the skull. Its discovery serves as a link between the genus Tenontosaurus and the Rhabdodontidae, with both along with Iani being members of the clade Rhabdodontomorpha. [1]
The Iani holotype specimen, NCSM 29373, was discovered in 2014 in sediments of the Cedar Mountain Formation (lower Mussentuchit Member) in Emery County, Utah, United States. The specimen consists of a partial skeleton including a nearly complete, disarticulated skull, cervical, dorsal, sacral, and caudal vertebrae, ribs and haemal arches, partial pectoral and pelvic girdles, and the right arm and leg. [1]
In 2023, Zanno et al. described Iani smithi as a new genus and species of rhabdodontomorph iguanodontian based on these fossil remains. The generic name, "Iani", alludes to Ianus, the Roman god of transitions, referencing the changing biota of the time. The specific name, "smithi", honors Joshua Aaron Smith and his paleontological contributions. [1]
Zanno et al. (2023) recovered Iani as a basal rhabdodontomorph member of the Iguanodontia. They interpreted it as a transitional taxon between Tenontosaurus and other Late Cretaceous rhabdodontomorphs (the Rhabdodontidae). The cladograms below display the results of their phylogenetic analyses using different datasets: [1]
Topology 1: Poole (2022) dataset [2]
| Topology 2: Dieudonné et al. (2021) dataset [3]
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Muttaburrasaurus was a genus of herbivorous iguanodontian ornithopod dinosaur, which lived in what is now northeastern Australia sometime between 112 and 103 million years ago during the early Cretaceous period. It has been recovered in some analyses as a member of the iguanodontian clade Rhabdodontomorpha. After Kunbarrasaurus, it is Australia's most completely known dinosaur from skeletal remains. It was named after Muttaburra, the site in Queensland, Australia, where it was found.
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Nedcolbertia is a genus of theropod dinosaur from the Early Cretaceous Period of North America.
Theiophytalia is a genus of herbivorous iguanodontian dinosaur from the lower Cretaceous period of Colorado, USA. It contains a single species, T. kerri.
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Hippodraco is a genus of iguanodontian ornithopod dinosaur from the Early Cretaceous Cedar Mountain Formation of Utah, United States. The genus contains a single species, H. scutodens, known from a partial skeleton belonging to an immature individual.
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Cifelliodon is an extinct genus of mammaliaforms from the Lower Cretaceous of North America. In the describing paper, it was considered one of the latest surviving haramiyids yet known, belonging to the family Hahnodontidae. Its discovery led to the proposal to remove hahnodontids from the larger well-known group, the multituberculates. However, later papers have considered it to be a basal allotherian outside of Haramiyida.
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