Species
Valid Extinct

Troodon formosus

Leidy 1856

No Wikipedia summary available.

Temporal range
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
252 201 145 66 0 Ma
PBDB occurrences
55
Group
Dinosaures
Carnivore, omnivore Ground dwelling Terrestrial
Classification
Dinosauria Unranked clade
Theropoda Unranked clade
Neotheropoda Unranked clade
Averostra Unranked clade
Tetanurae Unranked clade
Coelurosauria Unranked clade
Maniraptora Unranked clade
Paraves Unranked clade
Deinonychosauria Infraorder
Troodontidae Family
Troodontinae Subfamily
Troodontini Tribe
Troodon Genus
Troodon formosus Species
Fossil sites 55 geolocated sites
Distribution
Top countries
🇨🇦 Canada
29
🇺🇸 United States
25
🇷🇺 Russia
1
Geological formations
Oldman
13
Prince Creek
5
Ferris
5
Kakanaut
1
Temporal distribution
Maastrichtian (72.2–66 Ma)
12
Campanian (83.6–72.2 Ma)
43
Bibliography
Original description
J. Leidy. 1856. Notices of remains of extinct reptiles and fishes, discovered by Dr. F. V. Hayden in the bad lands of the Judith River, Nebraska Territory. Proceedings of the Academy of Natural Sciences of Philadelphia 8:72-73
Bibliography (23)
D. W. Larson and P. J. Currie. 2013. Multivariate analyses of small theropod dinosaur teeth and implications for paleoecological turnover through time. PLoS ONE 8(1):e54329:1-14 DOI ↗
A. R. Fiorillo, P. J. McCarthy, and P. P. Flaig, E. Brandlen, D. W. Norton, P. Zippi, L. Jacobs, R. A. Gangloff. 2010. Paleontology and paleoenvironmental interpretation of the Kikak-Tegoseak Quarry (Prince Creek Formation: Late Cretaceous), northern Alaska: a multi-disciplinary study of a high-latitude ceratopsian dinosaur bonebed. New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium. Indiana University Press, Bloomington
A. R. Fiorillo, R. S. Tykoski, and P. J. Currie, P. J. McCarthy, P. Flaig. 2009. Description of two partial Troodon braincases from the Prince Creek Formation (Upper Cretaceous), North Slope Alaska. Journal of Vertebrate Paleontology 29(1):178-187 DOI ↗
A. O. Averianov and H.-D. Sues. 2007. A new troodontid (Dinosauria: Theropoda) from the Cenomanian of Uzbekistan, with a review of troodontid records from the territories of the former Soviet Union. Journal of Vertebrate Paleontology 27(1):87-98 DOI ↗
M. T. Carrano. 2006. Fossil Vertebrate Collections, Museum of the Rockies
A. R. Fiorillo. 2005. Turtle tracks in the Judith River Formation (Upper Cretaceous) of south-central Montana. Palaeontologia Electronica 9(1):1-11
D. J. Varricchio, J. R. Horner, and F. D. Jackson. 2002. Embryos and eggs for the Cretaceous theropod dinosaur Troodon formosus. Journal of Vertebrate Paleontology 22(3):564-576 DOI ↗
A. R. Fiorillo and R. A. Gangloff. 2001. 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 ↗
J. Peng, A. P. Russell, and D. B. Brinkman. 2001. Vertebrate microsite assemblages (exclusive of mammals) from the Foremost and Oldman Formations of the Judith River Group (Campanian) of southeastern Alberta: an illustrated guide. Provincial Museum of Alberta, Natural History Occasional Paper 25:1-54 DOI ↗
M. J. Ryan, A. P. Russell, and D. A. Eberth, P. J. Currie. 2001. The taphonomy of a Centrosaurus (Ornithischia: Ceratopsidae) bone bed from the Dinosaur Park Formation (Upper Campanian), Alberta, Canada, with comments on cranial ontogeny. Palaios 16:482–506 DOI ↗
J. A. Lillegraven and J. J. Eberle. 1999. Vertebrate faunal changes through Lancian and Puercan time in southern Wyoming. Journal of Paleontology 73(4):691-710 DOI ↗
D. A. Eberth and D. B. Brinkman. 1997. Paleoecology of an estuarine, incised-valley fill in the Dinosaur Park Formation (Judith River Group, Upper Cretaceous) of southern Alberta, Canada. Palaios 12:43-58 DOI ↗
J. R. Horner and D. B. Weishampel. 1996. A comparative embryological study of two ornithischian dinosaurs (correction). Nature 383:103 DOI ↗
A. R. Fiorillo and P. J. Currie. 1994. Theropod teeth from the Judith River Formation (Upper Cretaceous) of south-central Montana. Journal of Vertebrate Paleontology 14(1):74-80 DOI ↗
D. J. Varricchio. 1993. Taphonomy of Jack's Birthday site, a diverse dinosaur bone bed. Journal of Vertebrate Paleontology 13(3, suppl.):61A
S. M. Kurzanov and H. Osmólska. 1991. Tochisaurus nemegtensis gen. et sp. n., a new troodontid dinosaur (Dinosauria, Theropoda) from Mongolia. Acta Palaeontologica Polonica 36(1):69-76
D. B. Brinkman. 1990. Paleontology of the Judith River Formation (Campanian) of Dinosaur National Park, Alberta, Canada: evidence from vertebrate microfossil locality. Palaeogeography, Palaeoclimatology, Palaeoecology 78:37-54
M. Montellano. 1988. Alphadon halleyi (Didelphidae, Marsupialia) from the Two Medicine Formation (Late Cretaceous, Judithian) of Montana. Journal of Vertebrate Paleontology 8(4):378-382 DOI ↗
P. J. Currie. 1987. Bird-like characteristics of the jaws and teeth of troodontid theropods (Dinosauria, Saurischia). Journal of Vertebrate Paleontology 7(1):72-81 DOI ↗
A. Sahni. 1972. The vertebrate fauna of the Judith River Formation, Montana. Bulletin of the American Museum of Natural History 147(6):321-412
L. S. Russell. 1946. The lower jaw of the theropod dinosaur Troödon. Transactions of the Royal Society of Canada, series 3 60:171
B. Brown and E. M. Schlaikjer. 1943. A study of the troödont dinosaurs with the description of a new genus and four new species. Bulletin of the American Museum of Natural History 82(5):115-150
J. Leidy. 1856. Notices of remains of extinct reptiles and fishes, discovered by Dr. F. V. Hayden in the bad lands of the Judith River, Nebraska Territory. Proceedings of the Academy of Natural Sciences of Philadelphia 8:72-73