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| == Discovery and naming == | == Discovery and naming == | ||
| The ''Ahvaytum'' fossil material was discovered in outcrops of the lower ] (Garrett's Surprise locality) in west-central Wyoming, United States. The ] specimen, UWGM 1975, is an isolated left ].<ref name="Ahvaytum"/> First noted in a 2020 abstract with its specimen number unmentioned, UWGM 1975 was initially thought to represent an early-diverging ] before its official description.<ref>{{cite book |author1=Fitch, A.J.|author2=Lovelace, D.M.|author3=Stocker, M.R.|year=2020 |chapter=The oldest dinosaur from the northern hemisphere and the origins of Theropoda |title=78th Annual Meeting - SVP 2020 Program Guide |publisher=Society of Vertebrate Paleontology |page=140–141 |url=https://vertpaleo.org/wp-content/uploads/2021/03/SVP_2020_Program-Abstracts-Volume-FINAL-for-Publishing-1.27.2021.pdf }}</ref><ref>{{cite journal|author1=Lovelace, D.M.|author2=Fitch, A.J.|author3=Schwartz, D.|author4=Schmitz, M.|year=2024|title=Concurrence of Late Triassic lithostratigraphic, radioisotopic, and biostratigraphic data support a Carnian age for the Popo Agie Formation (Chugwater Group), Wyoming, US|journal=GSA Bulletin|volume=136|issue=5-6|pages=2305–2324|doi=10.1130/B36807.1}}</ref> Specimen UWGM 7549, a partial left ] (] end) was referred to ''Ahvaytum'' since it was found within a {{convert|5|m|ft}} ] of the holotype and its anatomy is consistent with saurischians.<ref name="Ahvaytum"/> | The ''Ahvaytum'' fossil material was discovered in outcrops of the lower ] (Garrett's Surprise locality) in west-central Wyoming, United States. The ] specimen, UWGM 1975, is an isolated left ].<ref name="Ahvaytum"/> First noted in a 2020 abstract with its specimen number unmentioned, UWGM 1975 was initially thought to represent an early-diverging ] before its official description.<ref>{{cite book |author1=Fitch, A.J.|author2=Lovelace, D.M.|author3=Stocker, M.R.|year=2020 |chapter=The oldest dinosaur from the northern hemisphere and the origins of Theropoda |title=78th Annual Meeting - SVP 2020 Program Guide |publisher=Society of Vertebrate Paleontology |page=140–141 |url=https://vertpaleo.org/wp-content/uploads/2021/03/SVP_2020_Program-Abstracts-Volume-FINAL-for-Publishing-1.27.2021.pdf }}</ref><ref name=Lovelace2024>{{cite journal|author1=Lovelace, D.M.|author2=Fitch, A.J.|author3=Schwartz, D.|author4=Schmitz, M.|year=2024|title=Concurrence of Late Triassic lithostratigraphic, radioisotopic, and biostratigraphic data support a Carnian age for the Popo Agie Formation (Chugwater Group), Wyoming, US|journal=GSA Bulletin|volume=136|issue=5-6|pages=2305–2324|doi=10.1130/B36807.1}}</ref> Specimen UWGM 7549, a partial left ] (] end) was referred to ''Ahvaytum'' since it was found within a {{convert|5|m|ft}} ] of the holotype and its anatomy is consistent with saurischians.<ref name="Ahvaytum"/> | ||
| The binomial name ''Ahvaytum bahndooiveche'' is created in the ] language by students and elders of that ], intended to counteract a perceived "colonialism" in the form of using names derived from European languages. The generic name, ''Ahvaytum'' ({{IPA-all|ɔveɪtəm}}), means "long ago" and refers to the specimen's old age, and the specific name, ''bahndooiveche'' ({{IPA-all|bɔnduivitʃi}}), means both "salamander" (referring to the salamanders present around the discovery location) and "dinosaur".<ref name=Ahvaytum /> | The binomial name ''Ahvaytum bahndooiveche'' is created in the ] language by students and elders of that ], intended to counteract a perceived "colonialism" in the form of using names derived from European languages. The generic name, ''Ahvaytum'' ({{IPA-all|ɔveɪtəm}}), means "long ago" and refers to the specimen's old age, and the specific name, ''bahndooiveche'' ({{IPA-all|bɔnduivitʃi}}), means both "salamander" (referring to the salamanders present around the discovery location) and "dinosaur".<ref name=Ahvaytum /> | ||
| ==Paleoenvironment== | ==Paleoenvironment== | ||
| Deckman, Lovelace and Holland (2024) suggested that the Popo Agie Formation represents a common river environment, specifically a distributive fluvial system.<ref>{{cite journal|author1=Deckman, M.E.|author2=Lovelace, D.M.|author3=Holland, S.M.|title=A Reinterpretation of the Jelm and Popo Agie Formations (Triassic, Wyoming) as a Distributive Fluvial System (DFS) and the Role of the Accommodation/Sedimentation Ratio in DFS Deposition|journal=The Mountain Geologist|volume=61|issue=3|pages=219-248|doi=10.31582/rmag.mg.61.3.219}}</ref> Dinosaurian trace fossils and fragmentary remains of ] have been discovered from this formation.<ref name=Ahvaytum /> | Deckman, Lovelace and Holland (2024) suggested that the Popo Agie Formation represents a common river environment, specifically a distributive fluvial system.<ref>{{cite journal|author1=Deckman, M.E.|author2=Lovelace, D.M.|author3=Holland, S.M.|title=A Reinterpretation of the Jelm and Popo Agie Formations (Triassic, Wyoming) as a Distributive Fluvial System (DFS) and the Role of the Accommodation/Sedimentation Ratio in DFS Deposition|journal=The Mountain Geologist|volume=61|issue=3|pages=219-248|doi=10.31582/rmag.mg.61.3.219}}</ref> Dinosaurian trace fossils and fragmentary remains of ] have been discovered from this formation.<ref name=Ahvaytum /> The large ] '']'', the ] '']'', the ]ns '']'' and '']'', and the ] '']'' are also known from this formation.<ref name=Lovelace2024/> | ||
| == References == | == References == | ||
Revision as of 04:26, 8 January 2025
Genus of early sauropodomorph dinosaurs
| Ahvaytum Temporal range: Late Triassic (Carnian), ~230 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | †Sauropodomorpha (?) |
| Genus: | †Ahvaytum Lovelace et al., 2025 |
| Species: | †A. bahndooiveche |
| Binomial name | |
| †Ahvaytum bahndooiveche Lovelace et al., 2025 | |
Ahvaytum (meaning "long ago") is an extinct genus of probable basal sauropodomorph saurischian dinosaurs from the Late Triassic Popo Agie Formation of Wyoming, United States. The genus contains a single species, A. bahndooiveche, known from fragmentary hindlimb bones. Ahvaytum represents the oldest known named dinosaur of the low-latitude Laurasian continent.
Discovery and naming
The Ahvaytum fossil material was discovered in outcrops of the lower Popo Agie Formation (Garrett's Surprise locality) in west-central Wyoming, United States. The holotype specimen, UWGM 1975, is an isolated left astragalus. First noted in a 2020 abstract with its specimen number unmentioned, UWGM 1975 was initially thought to represent an early-diverging theropod before its official description. Specimen UWGM 7549, a partial left femur (proximal end) was referred to Ahvaytum since it was found within a 5 metres (16 ft) radius of the holotype and its anatomy is consistent with saurischians.
The binomial name Ahvaytum bahndooiveche is created in the Eastern Shoshone language by students and elders of that people, intended to counteract a perceived "colonialism" in the form of using names derived from European languages. The generic name, Ahvaytum (IPA: [ɔveɪtəm]), means "long ago" and refers to the specimen's old age, and the specific name, bahndooiveche (IPA: [bɔnduivitʃi]), means both "salamander" (referring to the salamanders present around the discovery location) and "dinosaur".
Paleoenvironment
Deckman, Lovelace and Holland (2024) suggested that the Popo Agie Formation represents a common river environment, specifically a distributive fluvial system. Dinosaurian trace fossils and fragmentary remains of silesaurids have been discovered from this formation. The large temnospondyl Anaschisma, the rhynchosaur Beesiiwo, the pseudosuchians Heptasuchus and Poposaurus, and the dicynodont Eubrachiosaurus are also known from this formation.
References
- ^ Lovelace, David M; Kufner, Aaron M; Fitch, Adam J; Curry Rogers, Kristina; Schmitz, Mark; Schwartz, Darin M; LeClair-Diaz, Amanda; St.Clair, Lynette; Mann, Joshua; Teran, Reba (2025-01-01). "Rethinking dinosaur origins: oldest known equatorial dinosaur-bearing assemblage (mid-late Carnian Popo Agie FM, Wyoming, USA)". Zoological Journal of the Linnean Society. 203 (1): zlae153. doi:10.1093/zoolinnean/zlae153. ISSN 0024-4082.
- Fitch, A.J.; Lovelace, D.M.; Stocker, M.R. (2020). "The oldest dinosaur from the northern hemisphere and the origins of Theropoda". 78th Annual Meeting - SVP 2020 Program Guide (PDF). Society of Vertebrate Paleontology. p. 140–141.
- ^ Lovelace, D.M.; Fitch, A.J.; Schwartz, D.; Schmitz, M. (2024). "Concurrence of Late Triassic lithostratigraphic, radioisotopic, and biostratigraphic data support a Carnian age for the Popo Agie Formation (Chugwater Group), Wyoming, US". GSA Bulletin. 136 (5–6): 2305–2324. doi:10.1130/B36807.1.
- Deckman, M.E.; Lovelace, D.M.; Holland, S.M. "A Reinterpretation of the Jelm and Popo Agie Formations (Triassic, Wyoming) as a Distributive Fluvial System (DFS) and the Role of the Accommodation/Sedimentation Ratio in DFS Deposition". The Mountain Geologist. 61 (3): 219–248. doi:10.31582/rmag.mg.61.3.219.
