Stenonychosaurus (North American Dinosaurs)

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Fiorillo, Anthony R.; Gangloff, Roland A. (2000). "Theropod teeth from the Prince Creek Formation (Cretaceous) of Northern Alaska, with speculations on Arctic dinosaur paleoecology". Journal of Vertebrate Paleontology. 20 (4): 675–682. doi: 10.1671/0272-4634(2000)020[0675:TTFTPC]2.0.CO;2. S2CID 130766946. A more complete skeleton of Stenonychosaurus was described by Dale Russell in 1969 from the Dinosaur Park Formation, which eventually formed the scientific foundation for a famous life-sized sculpture of Stenonychosaurus accompanied by its fictional, humanoid descendant, the "dinosauroid". [1] Russell, D. A. (1987). "Models and paintings of North American dinosaurs." In: Czerkas, S. J. & Olson, E. C. (eds) Dinosaurs Past and Present, Volume I. Natural History Museum of Los Angeles County/University of Washington Press (Seattle and Washington), pp.114–131.

Evans, D. C.; Cullen, T. M.; Larson, D. W.; Rego, A. (2017). "A new species of troodontid theropod (Dinosauria: Maniraptora) from the Horseshoe Canyon Formation (Maastrichtian) of Alberta, Canada". Canadian Journal of Earth Sciences. 54 (8): 813–826. Bibcode: 2017CaJES..54..813E. doi: 10.1139/cjes-2017-0034. For most of the 19th and 20th centuries troodontid fossils from North America tended to be assigned to T. formosus. Based on this, Troodon ranged from Mexico in the south to Montana and beyond Alberta in the north and existed as a species through some fifteen million years. A contradiction indeed, when the rapid dinosaur faunal turnover of Laramidia in the Late Cretaceous is considered. What does this have to do with the dinosauroid? Russell wrote several times that dinosauroid-like humanoids could have evolved in “some biospheres” (Naish & Tattersdill 2021, p. 8 unpaginated), and said more than once between 1979 and 1981 that he would be able to bring a hypothetical reconstruction of a big-brained dinosaur to SETI-themed meetings. Remember that all of this was happening a couple of years before the dinosauroid was brought to life in 3D form. I also think it’s important that, again, the dinosauroid was being used to promote ideas about intelligent aliens: it again makes me think that Russell’s focus wasn’t on speculative dinosaur evolution at all, but on promoting the idea of humanoid intelligences evolving elsewhere in the universe. a b van der Reest, A. J.; Currie, P. J. (2017). "Troodontids (Theropoda) from the Dinosaur Park Formation, Alberta, with a description of a unique new taxon: implications for deinonychosaur diversity in North America" (PDF). Canadian Journal of Earth Sciences. 54 (9): 919–935. Bibcode: 2017CaJES..54..919V. doi: 10.1139/cjes-2017-0031. hdl: 1807/78296. In 2017, Evans and colleagues, building on the work of Zanno and others, confirmed the currently undiagnostic nature of the holotype of Troodon formosus and suggested that Stenonychosaurus be used for troodontid skeletal material from the Dinosaur Park Formation. [6] Later in 2017, Van der Reest and Currie found Stenonychosaurus to be a valid genus, but reassigned much of the known material to the new genus Latenivenatrix. [7]

a b Cullen, Thomas M.; Zanno, Lindsay; Larson, Derek W.; Todd, Erinn; Currie, Philip J.; Evans, David C. (2021-06-30). "Anatomical, morphometric, and stratigraphic analyses of theropod biodiversity in the Upper Cretaceous (Campanian) Dinosaur Park Formation1". Canadian Journal of Earth Sciences. 58 (9): 870–884. doi: 10.1139/cjes-2020-0145. According to van der Reest and his co-author, University of Alberta Professor Philip Currie, Latenivenatrix mcmasterae and Stenonychosaurus inequalis roamed the Earth around 72 million years ago during the Campanian, the fifth of six ages of the Upper Cretaceous epoch.

Paul, G. S. (2016). The Princeton Field Guide to Dinosaurs 2nd Edition. Princeton University Press. p.160. ISBN 978-0-691-16766-4.Troodon ( / ˈ t r oʊ . ə d ɒ n/ TROH-ə-don; Troödon in older sources) is a former wastebasket taxon and a potentially dubious genus of relatively small, bird-like theropod dinosaurs definitively known from the Campanian age of the Late Cretaceous period (about 77 mya). It includes at least one species, Troodon formosus, known from Montana. Discovered in October 1855, T. formosus was among the first dinosaurs found in North America, although it was thought to be a lizard until 1877. Several well-known troodontid specimens from the Dinosaur Park Formation in Alberta were once believed to be members of this genus. However, recent analyses in 2017 have found this genus to be undiagnostic and referred some of these specimens to the genus Stenonychosaurus (long believed to be synonymous with Troodon) some to the genus Latenivenatrix, and some to the genus Pectinodon. The genus name is Ancient Greek for "wounding tooth", referring to the teeth, which were different from those of most other theropods known at the time of their discovery. The teeth bear prominent, apically oriented serrations. These "wounding" serrations, however, are morphometrically more similar to those of herbivorous reptiles, and suggest a possibly omnivorous diet. [1] History of discovery [ edit ] Early research [ edit ] 1860 illustration of the T. formosus holotype tooth