PBDB Taxon

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Troodontidae

Reptilia - Troodontidae

Taxonomy

Troodontidae was named by Gilmore (1924). It was considered monophyletic by Zheng et al. (2009).

It was synonymized subjectively with Pachycephalosauridae by Romer (1956), Romer (1966), Maryańska and Osmólska (1974).

It was assigned to Iguanodontoidae by Hay (1930); to Ornithopoda by Lull (1924), Russell (1930), Roxo (1937), Brown and Schlaikjer (1943); to Orthopoda by Gilmore (1924), Bohlin (1953); to Megalosauroidea by Kuhn (1966); to Protoavia by Paul (1988); to Oviraptorosauria by Russell and Dong (1994); to Bullatosauria by Holtz (1994), Nessov (1995), Holtz and Padian (1995), Hutchinson and Padian (1997); to Coelurosauria by Currie (1995), Zinke (1998); to Theropoda by Eberth et al. (2001); to Theropoda by Russell (1948), Peng et al. (2001); to Saurischia by Pearson et al. (2002), Sankey et al. (2002); to Arctometatarsalia by Holtz (1995), Holtz (1998), Senter et al. (2004); to Theropoda by Coulton (1976), Chure et al. (2006); to Eumaniraptora by Godefroit et al. (2013); to Paraves by Holtz (2000), Zanno et al. (2011), O'Connor and Sullivan (2014); to Coelurosauria by Williamson and Brusatte (2014); to Maniraptoriformes by Hendrickx and Mateus (2014); to Maniraptora by Benton (1990), Osmolska (1990), Chatterjee (1993), Currie (1997), Makovicky and Norell (2004), Xu et al. (2011), Xu et al. (2012), Pei et al. (2017), Shen et al. (2017), Xu et al. (2017), van der Reest and Currie (2017), Shen et al. (2017); and to Deinonychosauria by Gauthier (1986), Sereno (1997), Sereno (1998), Sereno (1999), Rauhut (2003), Senter (2007), Zheng et al. (2009), Gianechini et al. (2017), Hartman et al. (2019).

Synonyms

Saurornitholestes robustus was named by Sullivan (2006). Its type specimen is SMP VP-1955, a partial skull (frontal), and it is not a trace fossil. Its type locality is north fork, Alamo Wash, SMP Loc. 388a, which is in a Campanian terrestrial horizon in the Kirtland Formation of New Mexico.

It was considered a nomen dubium by Evans et al. (2014), Williamson and Brusatte (2014).
Saurornithoididae was named by Barsbold (1974).

It was synonymized subjectively with Troodontidae by Gauthier (1986), Osmolska (1990), Nessov (1995), Makovicky and Norell (2004), Williamson and Brusatte (2014).

It was assigned to Theropoda by Thulborn (1984); to Deinonychosauria by Barsbold (1976), Barsbold (1977), Russell (1984), Gauthier and Padian (1985), Buffetaut et al. (1986); to Theropoda by Barsbold (1974), Rozhdestvensky (1977), Carroll (1988); and to Coelurosauria by Barsbold (1983), Dong (1992).
Bradycneme was named by Harrison and Walker (1975). Its type is Bradycneme draculae.

It was synonymized subjectively with Elopteryx by Le Loeuff et al. (1992); it was considered a nomen dubium by Makovicky and Norell (2004).

It was assigned to Bradycnemidae by Harrison and Walker (1975), Brodkorb (1978); to Theropoda by Buffetaut et al. (1986); to Theropoda by Carroll (1988); and to Troodontidae by Paul (1988), Weishampel et al. (1991), Varricchio (1997).
Heptasteornis was named by Harrison and Walker (1975). Its type is Heptasteornis andrewsi.

It was synonymized subjectively with Troodon by Paul (1988); it was synonymized subjectively with Elopteryx by Le Loeuff et al. (1992); it was considered a nomen dubium by Makovicky and Norell (2004), Martinelli and Vera (2007).

It was assigned to Bradycnemidae by Harrison and Walker (1975); to Theropoda by Brodkorb (1978), Buffetaut et al. (1986); to Theropoda by Carroll (1988); and to Troodontidae by Weishampel et al. (1991), Varricchio (1997).
Polyodontosaurus grandis was named by Gilmore (1932). Its type specimen is NMC 8540, a mandible, and it is a 3D body fossil. Its type locality is 3 mi. southwest of mouth of Berry Creek (NMC), which is in a Campanian terrestrial horizon in the Dinosaur Park Formation of Canada.

It was synonymized subjectively with Stenonychosaurus inequalis by Russell (1969), Sues (1977); it was synonymized subjectively with Saurornithoides inequalis by Carpenter (1982); it was synonymized subjectively with Troodon formosus by Currie (1987), Currie et al. (1990), Varricchio (1997), Peng et al. (2001), Makovicky and Norell (2004); it was considered a nomen dubium by van der Reest and Currie (2017).
Laelaps laevifrons was named by Cope (1876). Its type specimen is AMNH 3961, a tooth, and it is a 3D body fossil.

It was recombined as Dryptosaurus laevifrons by Hay (1902), Steel (1970); it was recombined as Dromaeosaurus laevifrons by Matthew and Brown (1922), Huene (1927), Hay (1930), Russell (1930), Kuhn (1939); it was considered a nomen dubium by Makovicky and Norell (2004).
Laelaps cristatus was named by Cope (1876). Its type specimen is AMNH 3954, a tooth, and it is a 3D body fossil.

It was recombined as Dryptosaurus cristatus by Hay (1902), Steel (1970); it was recombined as Dromaeosaurus cristatus by Matthew and Brown (1922), Huene (1927), Hay (1930), Kuhn (1939), Ostrom (1965); it was recombined as Troodon cristatus by Olshevsky (2000); it was considered a nomen dubium by Makovicky and Norell (2004).
Bradycneme draculae was named by Harrison and Walker (1975). Its type specimen is BMNH A.1588 and is a 3D body fossil. Its type locality is Szentpéterfalva, Hateg Basin, which is in a Maastrichtian fluvial sandstone in the Sînpetru Formation of Romania. It is the type species of Bradycneme.

It was synonymized subjectively with Elopteryx nopcsai by Le Loeuff et al. (1992); it was considered a nomen dubium by Makovicky and Norell (2004).
Heptasteornis andrewsi was named by Harrison and Walker (1975). Its type specimen is BMNH A.4359, a limb element (distal end, left tibiotarsus), and it is a 3D body fossil. Its type locality is Szentpéterfalva, Hateg Basin, which is in a Maastrichtian fluvial sandstone in the Sînpetru Formation of Romania. It is the type species of Heptasteornis.

It was recombined as Troodon andrewsi by Paul (1988); it was synonymized subjectively with Elopteryx nopcsai by Le Loeuff et al. (1992); it was considered a nomen dubium by Makovicky and Norell (2004).
Koparion was named by Chure (1994).

It was considered a nomen dubium by Makovicky and Norell (2004).

It was assigned to Troodontidae by Chure (1994), Varricchio (1997), Chure et al. (2006).
Koparion douglassi was named by Chure (1994). Its type specimen is DINO 3353, a tooth, and it is a 3D body fossil. Its type locality is DNM 94, Rainbow Park microsite, which is in a Tithonian crevasse splay mudstone in the Morrison Formation of Utah.

It was considered a nomen dubium by Makovicky and Norell (2004).

Synonymy list

Year	Name and author
1876	Laelaps cristatus Cope p. 344
1876	Laelaps laevifrons Cope p. 344
1877	Laelaps cristatus Cope p. 572
1877	Laelaps laevifrons Cope p. 572
1902	Dryptosaurus cristatus Hay p. 488
1902	Dryptosaurus laevifrons Hay p. 488
1922	Dromaeosaurus cristatus Matthew and Brown p. 376
1922	Dromaeosaurus laevifrons Matthew and Brown p. 376
1924	Troodontidae Gilmore pp. 7-8
1924	Troodontidae Lull p. 238
1927	Dromaeosaurus cristatus Huene p. 260
1927	Dromaeosaurus laevifrons Huene p. 260
1930	Dromaeosaurus cristatus Hay p. 180
1930	Dromaeosaurus laevifrons Hay p. 181
1930	Troodontidae Hay p. 207
1930	Dromaeosaurus laevifrons Russell p. 142
1930	Troodontidae Russell p. 142
1932	Polyodontosaurus grandis Gilmore p. 117 figs. Pl. 1
1937	Troodontidae Roxo p. 65
1939	Dromaeosaurus cristatus Kuhn p. 49
1939	Dromaeosaurus laevifrons Kuhn p. 50
1943	Troodontidae Brown and Schlaikjer p. 126
1948	Troodontidae Russell p. 629
1951	Polyodontosaurus grandis Sternberg p. 257
1953	Troodontidae Bohlin p. 32
1965	Dromaeosaurus cristatus Ostrom p. 39
1966	Troodontidae Kuhn p. 96
1970	Dryptosaurus cristatus Steel p. 31
1970	Dryptosaurus laevifrons Steel p. 31
1970	Polyodontosaurus grandis Steel p. 44
1974	Saurornithoididae Barsbold p. 7
1975	Heptasteornis andrewsi Harrison and Walker pp. 399-400 figs. Pl. 65:6-7; Pl. 66:1-7
1975	Bradycneme Harrison and Walker pp. 564-565
1975	Bradycneme draculae Harrison and Walker p. 565 figs. Pl. 65:1-5
1975	Heptasteornis Harrison and Walker p. 566 figs. Pl. 65:6-7; Pl. 66:1-7
1975	Heptasteornis andrewsi Harrison and Walker p. 566 figs. Pl. 65:6-7; Pl. 66:1-7
1976	Saurornithoididae Barsbold p. 74
1976	Troodontidae Coulton p. 177
1977	Saurornithoididae Barsbold p. 50
1977	Saurornithoididae Rozhdestvensky p. 112
1978	Bradycneme Brodkorb p. 223
1978	Bradycneme draculae Brodkorb p. 223
1978	Heptasteornis Brodkorb p. 224
1978	Heptasteornis andrewsi Brodkorb p. 224
1983	Saurornithoididae Barsbold p. 86
1984	Saurornithoididae Russell p. 28
1984	Saurornithoididae Thulborn p. 132
1985	Saurornithoididae Gauthier and Padian p. 190
1986	Bradycneme Buffetaut et al. p. 1395
1986	Bradycneme draculae Buffetaut et al. p. 1395
1986	Heptasteornis Buffetaut et al. p. 1395
1986	Heptasteornis andrewsi Buffetaut et al. p. 1395
1986	Saurornithoididae Buffetaut et al. p. 1395
1986	Troodontidae Gauthier p. 11
1988	Bradycneme Carroll
1988	Heptasteornis Carroll
1988	Saurornithoididae Carroll
1988	Troodontidae Paul p. 394
1988	Troodon andrewsi Paul pp. 399-400
1988	Bradycneme Paul p. 400
1988	Bradycneme draculae Paul p. 400
1990	Troodontidae Benton p. 19
1990	Troodontidae Osmolska p. 150
1991	Bradycneme Weishampel et al. p. 209
1991	Bradycneme draculae Weishampel et al. p. 209
1991	Heptasteornis Weishampel et al. p. 209
1991	Heptasteornis andrewsi Weishampel et al. p. 209
1992	Saurornithoididae Dong p. 164
1993	Troodontidae Chatterjee p. 283
1994	Koparion Chure p. 11
1994	Koparion douglassi Chure p. 11 figs. Pl. 1
1994	Troodontidae Holtz
1994	Troodontidae Russell and Dong p. 2125
1995	Troodontidae Currie p. 25A
1995	Troodontidae Holtz, Jr. p. 35A
1995	Troodontidae Holtz, Jr. and Padian p. 35A
1995	Troodontidae Nessov p. 41
1997	Troodontidae Currie p. 733
1997	Troodontidae Hutchinson and Padian p. 130
1997	Troodontidae Sereno p. 444
1997	Bradycneme Varricchio p. 750
1997	Bradycneme draculae Varricchio p. 750
1997	Heptasteornis Varricchio p. 750
1997	Heptasteornis andrewsi Varricchio p. 750
1997	Koparion Varricchio p. 750
1997	Koparion douglassi Varricchio p. 750
1998	Troodontidae Holtz, Jr. p. 40
1998	Troodontidae Sereno p. 65
1998	Troodontidae Zinke p. 184
1999	Troodontidae Sereno p. 2139 fig. 2
2000	Koparion douglassi Chure p. 2
2000	Troodontidae Holtz, Jr. p. 13 fig. 5
2000	Troodon cristatus Olshevsky p. 97
2001	Troodontidae Eberth et al. p. 56
2001	Troodontidae Peng et al. p. 37
2002	Troodontidae Pearson et al. p. 154
2002	Troodontidae Sankey et al. p. 755
2003	Bradycneme draculae Grigorescu p. 100
2003	Heptasteornis andrewsi Grigorescu p. 100
2003	Troodontidae Rauhut p. 159
2004	Troodontidae Makovicky and Norell p. 185
2004	Troodontidae Senter et al. p. 2 fig. 2
2005	Koparion douglassi Carpenter et al. pp. 24-26
2005	Bradycneme draculae Grigorescu p. 204
2005	Heptasteornis andrewsi Grigorescu p. 204
2006	Koparion Chure et al. p. 236
2006	Koparion douglassi Chure et al. p. 236
2006	Troodontidae Chure et al. p. 236
2006	Bradycneme draculae Dalla Vecchia p. 13
2006	Heptasteornis andrewsi Dalla Vecchia p. 13
2006	Koparion douglassi Hunt and Lucas p. 117
2006	Koparion douglassi Mateus p. 231
2006	Saurornitholestes robustus Sullivan p. 253 figs. 1-3
2007	Troodontidae Senter p. 437
2009	Troodontidae Zheng et al.
2011	Troodontidae Xu et al. p. 2
2011	Troodontidae Zanno et al. p. 3
2012	Koparion douglassi Tweet et al. p. 321
2012	Troodontidae Xu et al. p. 141
2013	Troodontidae Godefroit et al.
2014	Troodontidae Hendrickx and Mateus
2014	Troodontidae O'Connor and Sullivan
2014	Troodontidae Williamson and Brusatte p. 12
2015	Saurornitholestes robustus Jasinski p. 79
2017	Troodontidae Gianechini et al. p. 12 fig. 8
2017	Troodontidae Pei et al.
2017	Troodontidae Shen et al.
2017	Troodontidae Shen et al.
2017	Troodontidae Xu et al.
2017	Troodontidae van der Reest and Currie
2018	Koparion douglassi Tweet and Santucci p. 713
2019	Troodontidae Hartman et al.
2021	Bradycneme draculae Sellés et al. p. 8

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
—	Sauropsida
class	Reptilia
subclass	Eureptilia	()
—	Romeriida

Rank	Name	Author
—	Diapsida	()
—	Archosauromorpha	(Huene 1946)
—	Crocopoda
—	Archosauriformes	Gauthier 1986
—	Eucrocopoda
—	Archosauria	()
informal	Avemetatarsalia
—	Ornithodira
—	Dinosauromorpha
—	Dinosauriformes
—	Dinosauria	()
—	Theropoda	()
—	Neotheropoda
—	Averostra	Paul 2002
—	Tetanurae
—	Coelurosauria	()
—	Maniraptora
—	Paraves
infraorder	Deinonychosauria
family	Troodontidae
family	Troodontidae

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Fm. †Troodontidae Gilmore 1924

show all | hide all

G. †Albertavenator Evans et al. 2017

†Albertavenator curriei Evans et al. 2017

G. †Almas Pei et al. 2017

†Almas ukhaa Pei et al. 2017

G. †Anchiornis Xu et al. 2009

†Anchiornis huxleyi Xu et al. 2009

G. †Archaeornithoides Elzanowski and Wellnhofer 1992

†Archaeornithoides deinosauriscus Elzanowski and Wellnhofer 1992

G. †Daliansaurus Shen et al. 2017

†Daliansaurus liaoningensis Shen et al. 2017

G. †Geminiraptor Senter et al. 2010

†Geminiraptor suarezarum Senter et al. 2010

G. †Gobivenator Tsuihiji et al. 2014

†Gobivenator mongoliensis Tsuihiji et al. 2014

G. †Harenadraco Lee et al. 2024

†Harenadraco prima Lee et al. 2024

G. †Hesperornithoides Hartman et al. 2019

†Hesperornithoides miessleri Hartman et al. 2019

Subfm. †Jinfengopteryginae Turner et al. 2012

G. †Jinfengopteryx Ji et al. 2005

†Jinfengopteryx elegans Ji et al. 2005

G. †Liaoningvenator Shen et al. 2017

†Liaoningvenator curriei Shen et al. 2017

G. †Philovenator Xu et al. 2012

†Philovenator curriei Xu et al. 2012

G. †Tamarro Sellés et al. 2021

†Tamarro insperatus Sellés et al. 2021

G. †Papiliovenator Pei et al. 2022

†Papiliovenator neimengguensis Pei et al. 2022

G. †Pectinodon Carpenter 1982

†Pectinodon bakkeri Carpenter 1982

Invalid names: Pectinodon asiamericanus Nessov 1985 [nomen dubium]

Subfm. †Sinovenatorinae Shen et al. 2017

G. †Jianianhualong Xu et al. 2017

†Jianianhualong tengi Xu et al. 2017

G. †Mei Xu and Norell 2004

†Mei long Xu and Norell 2004

G. †Sinovenator Xu et al. 2002

†Sinovenator changii Xu et al. 2002

G. †Xiaotingia Xu et al. 2011

†Xiaotingia zhengi Xu et al. 2011

G. †Sinusonasus Xu and Wang 2004

†Sinusonasus magnodens Xu and Wang 2004

G. †Tochisaurus Kurzanov and Osmólska 1991

†Tochisaurus nemegtensis Kurzanov and Osmólska 1991

Subfm. †Troodontinae van der Reest and Currie 2017

G. †Borogovia Osmolska 1987

†Borogovia gracilicrus Osmolska 1987

G. †Byronosaurus Norell et al. 2000

†Byronosaurus jaffei Norell et al. 2000

G. †Hypnovenator Kubota et al. 2024

†Hypnovenator matsubaraetoheorum Kubota et al. 2024

G. †Latenivenatrix van der Reest and Currie 2017

†Latenivenatrix mcmasterae van der Reest and Currie 2017

G. †Linhevenator Xu et al. 2011

†Linhevenator tani Xu et al. 2011

G. †Saurornithoides Osborn 1924

†Saurornithoides mongoliensis Osborn 1924

G. †Sinornithoides Russell and Dong 1994

†Sinornithoides youngi Russell and Dong 1994

G. †Stenonychosaurus Sternberg 1932

†Stenonychosaurus inequalis Sternberg 1932

G. †Talos Zanno et al. 2011

†Talos sampsoni Zanno et al. 2011

G. †Troodon Leidy 1856

†Troodon formosus Leidy 1856

Invalid names: Polyodontosaurus Gilmore 1932 [synonym]

G. †Urbacodon Averianov and Sues 2007

†Urbacodon itemirensis Averianov and Sues 2007

†Urbacodon norelli Wang et al. 2024

G. †Zanabazar Norell et al. 2009

†Zanabazar junior Barsbold 1974

G. †Xixiasaurus Lü et al. 2010

†Xixiasaurus henanensis Lü et al. 2010

Invalid names: Bradycneme Harrison and Walker 1975 [nomen dubium], Heptasteornis Harrison and Walker 1975 [nomen dubium], Koparion Chure 1994 [nomen dubium], Laelaps cristatus Cope 1876 [nomen dubium], Laelaps laevifrons Cope 1876 [nomen dubium], Polyodontosaurus grandis Gilmore 1932 [nomen dubium], Saurornithoididae Barsbold 1974 [synonym], Saurornitholestes robustus Sullivan 2006 [nomen dubium]

Diagnosis

Reference	Diagnosis
R. S. Lull 1924	Aberrant Orthopoda with prernaxillary teeth, dome-like, thickened skull, and abdominal ribs.
B. Brown and E. M. Schlaikjer 1943	Small bipedal dinosaurs. Skull with moderate thickening of frontoparietal area. Node-like ornamentations of the skull weakly developed. Supratemporal openings usually nearly closed; ocassionally completely closed on one side. Face short and deep. Premaxillaries with teeth.

Measurements

No measurements are available

Composition:

hydroxyapatiteo

Entire body:

yeso

Adult length:

10 to < 100o

Adult width:

1.0 to < 10o

Adult height:

1.0 to < 10o

Maximum body mass:

100 kgg

Minimum body mass:

10 kgg

Architecture:

compact or denseo

Ontogeny:

accretion, modification of partso

Grouping:

solitaryo

Environment:

terrestrialf

Locomotion:

actively mobileo

Life habit:

ground dwellingf

Diet:

carnivoref

Diet 2:

omnivoref

Reproduction:

oviparousf

Dispersal:

direct/internalo

Dispersal 2:

mobileo

Created:

2005-09-11 17:03:06

Modified:

2005-09-11 19:03:56

Source: g = genus, f = family, o = order

References: Peczkis 1995, Marsh 1875, Holtz et al. 2000

Age range: base of the Oxfordian to the top of the Lancian or 161.50000 to 66.00000 Ma

Collections (220 total)

Time interval	Ma	Country or state	Original ID and collection number
Late/Upper Bathonian - Early/Lower Kimmeridgian	168.2 - 152.21	China (Liaoning)	Anchiornis huxleyi (106306) Anchiornis huxleyi, Xiaotingia zhengi (92421)
Oxfordian	161.5 - 154.8	China (Liaoning)	Anchiornis huxleyi (91487)
Kimmeridgian	154.8 - 149.2	Portugal (Leiria)	Troodontidae indet. (24563)
Kimmeridgian - Tithonian	154.8 - 143.1	USA (Wyoming)	Troodontidae indet. (74665)
Early/Lower Tithonian	149.2 - 145.06	France (Poitou-Charentes)	Troodontidae indet. (164377)
Tithonian	149.2 - 143.1	USA (Utah)	Koparion douglassi (22711)
Valanginian	137.05 - 132.6	USA (Utah)	Geminiraptor suarezarum (97956)
Valanginian - Albian	137.05 - 100.5	China (Nei Mongol)	Saurornithoides sp. (46934)
Barremian	125.77 - 121.4	China (Hebei)	Jinfengopteryx elegans (156414)
Late/Upper Barremian - Early/Lower Aptian	125.77 - 119.57	China (Liaoning)	Jianianhualong tengi (67611) Mei long (133789) Sinovenator changii (55685) Sinovenator changii, Daliansaurus liaoningensis, Liaoningvenator curriei (73438) Sinovenator changii, Mei long, Sinusonasus magnodens (53493) Sinovenator sp. (235272) Troodontidae indet. (83249)
Barremian - Aptian	125.77 - 113.2	Russian Federation (Kemerovo)	Troodontidae indet. (52808) Troodontidae indet., Urbacodon sp. (167303)
Barremian - Aptian	125.77 - 113.2	Russian Federation (Krasnoyarsk)	Urbacodon sp. (206601 206603)
Aptian	121.4 - 113.2	Russian Federation (Kemerovo)	Troodontidae indet., Urbacodon sp. (39680)
Aptian - Albian	121.4 - 100.5	Mongolia (Dornogov)	Troodontidae indet. (32362)
Early/Lower Albian	113.2 - 110.1	China (Gansu)	Sinornithoides sp. (45166)
Early/Lower Albian - Middle Albian	113.2 - 106.3	Japan (Hyōgo)	Hypnovenator matsubaraetoheorum (235979)
Cenomanian	100.5 - 93.9	Uzbekistan (Navoi)	Urbacodon itemirensis (70426)
Early/Lower Cenomanian	100.5 - 93.9	France (Poitou-Charentes)	Troodontidae indet. (73862)
Early/Lower Cenomanian	100.5 - 93.9	Uzbekistan (Navoi)	Pectinodon asiamericanus (64684) Saurornithoides sp. (64685)
Middle Cenomanian	100.5 - 93.9	USA (Texas)	Troodontidae indet. (102191)
Cenomanian - Santonian	100.5 - 83.6	Mongolia (Omnogov)	Troodontidae indet. (55254)
Middle Turonian - Late/Upper Turonian	93.9 - 89.8	Uzbekistan (Navoi)	Ornithomimidae indet. (58158)
Coniacian - Campanian	89.8 - 72.2	China (Henan)	Xixiasaurus henanensis (101070)
Early/Lower Santonian	85.7 - 83.6	Tajikistan (Sogd)	Saurornithoididae indet. (58701)
Late/Upper Santonian - Early/Lower Campanian	85.7 - 72.2	USA (Utah)	Troodontidae indet. (14413)
Santonian - Early/Lower Campanian	85.7 - 72.2	Kazakhstan (Qyzylorda)	Troodontidae indet. (53134)
Campanian	83.6 - 72.2	Mongolia (Ömnögovi Aimag)	Troodontidae indet. (130798)
Campanian	83.6 - 72.2	China (Nei Mongol)	Linhevenator tani, Philovenator curriei (131828) Papiliovenator neimengguensis (231896) Saurornithoides mongoliensis (46973) Troodontidae indet. (230211)
Campanian	83.6 - 72.2	Canada (Alberta)	Troodon formosus (58808)
Campanian	83.6 - 72.2	Mongolia (Omnogov)	Almas ukhaa (190544) Byronosaurus jaffei (37209) Troodontidae indet. (37211)
Campanian	83.6 - 72.2	Mongolia (Omnogov Aimak)	Saurornithoides mongoliensis (37213)
Early/Lower Campanian	83.6 - 72.2	Kazakhstan (Ongtüstik Qazaqstan)	Troodon sp. (59730)
Early/Lower Campanian	83.6 - 72.2	China (Jilin)	Troodontidae indet. (227000)
Late/Upper Campanian	83.6 - 72.2	USA (New Mexico)	Saurornitholestes robustus (76105 76106 76107) Theropoda indet. (222078) Troodontidae indet. (154661)
Late/Upper Campanian	83.6 - 72.2	Mongolia (Omnogov)	Archaeornithoides deinosauriscus (37009) Dromaeosauridae indet. (45090) Ornithoides oshiensis (46152) Velociraptor sp. (55256)
Late/Upper Campanian	83.6 - 72.2	Mexico (Baja California)	Troodon formosus (197021)
Late/Upper Campanian	83.6 - 72.2	USA (Montana)	Troodon formosus (22689 59373) Troodon sp. (25658)
Late/Upper Campanian	83.6 - 72.2	Mexico (Coahuila)	Troodon sp. (154244 170939) Troodontidae indet. (24257)
Late/Upper Campanian	83.6 - 72.2	Canada (Alberta)	Latenivenatrix mcmasterae (46953 229978) Polyodontosaurus grandis (64327) Stenonychosaurus inequalis (34745 45753 59115 59131 59137 184041) Troodon formosus (22659 22695 22697 22698 34307 34309 45264 45671 45892 45893 45897 45898 46951 47784 47807 47811 47812 64325 64326 76030) Troodon sp. (22699 45238 45261 45262 67874 67876 67881 67893 67894 89604 89605 238814) Troodon sp., Troodon formosus (53050) Troodon sp., Troodontidae indet. (52991) Troodontidae indet. (52656 221937 227125)
Late/Upper Campanian	83.6 - 72.2	USA (Utah)	Troodontidae indet. (131870)
Middle Campanian	83.6 - 72.2	USA (Montana)	Hypsilophodontidae indet. (13281) Troodon formosus (14437) Troodon formosus, Theropoda indet. (14453) Troodon sp. (53055 53056)
Middle Campanian	83.6 - 72.2	Canada (Alberta)	Saurornithoididae indet. (61470) Troodon formosus (45240 47795 47809) Troodon sp. (47794 67880 67892)
Middle Campanian - Late/Upper Campanian	83.6 - 72.2	Canada (Saskatchewan)	Troodon sp. (14494) Troodontidae indet. (229975)
Middle Campanian - Late/Upper Campanian	83.6 - 72.2	USA (Montana)	Troodon formosus (14446 14457 14490 50907 59217 64643 69213) Troodon sp. (14434 14462 60518 223339) Troodontidae indet. (167801)
Middle Campanian - Late/Upper Campanian	83.6 - 72.2	Canada (Alberta)	Stenonychosaurus inequalis (179240 179241 179242 179243 179244 179245 179246 217170) Troodon formosus (45821)
Middle Campanian - Late/Upper Campanian	83.6 - 72.2	China (Inner Mongolia)	Urbacodon norelli (235635)
Middle Campanian - Late/Upper Campanian	83.6 - 72.2	Mongolia (Omnogov)	Harenadraco prima (235647)
Late/Upper Campanian - Early/Lower Maastrichtian	83.6 - 66.0	Brazil (São Paulo)	Troodontidae indet. (232268 232269)
Late/Upper Campanian - Early/Lower Maastrichtian	83.6 - 66.0	Canada (Alberta)	Troodon sp. (34744 52072 144539 152271 152272) Troodon sp., Albertavenator curriei (152270)
Early/Lower Maastrichtian	72.2 - 66.0	USA (Alaska)	Troodon formosus (51889 51892 51893 88975) Troodon sp. (51890)
Early/Lower Maastrichtian	72.2 - 66.0	Canada (Alberta)	Albertavenator curriei (229870 229966) Troodon formosus (64324) Troodon sp. (55363 60563 96455 135739) Troodontidae indet. (69621 76062 220119)
Early/Lower Maastrichtian	72.2 - 66.0	Romania (Hunedoara)	Troodontidae indet., Bradycneme draculae, Elopteryx nopcsai (59410)
Lancian	72.2 - 66.0	USA (North Dakota)	Troodon sp. (14610)
Lancian	72.2 - 66.0	USA (Montana)	Troodon sp. (14508 14516 14521 14549 14568) Troodon sp., Troodontidae indet. (14582 14650) Troodontidae indet. (14623 14624)
Lancian	72.2 - 66.0	USA (South Dakota)	Troodon sp., Saurornithoides mongoliensis (14537 192251)
Lancian	72.2 - 66.0	USA (New Mexico)	Saurornithoididae indet. (14518)
Lancian	72.2 - 66.0	USA (Wyoming)	Pectinodon bakkeri, Saurornithoides inequalis (14519) Troodon formosus (14542 14543 75298 75435 75442) Troodon sp. (14505) Troodon sp., Troodontidae indet., Pectinodon bakkeri (14566)
Late/Upper Maastrichtian	72.2 - 66.0	USA (North Dakota)	Troodon sp. (45099)
Late/Upper Maastrichtian	72.2 - 66.0	China (Henan)	Troodontidae indet. (84996)
Late/Upper Maastrichtian	72.2 - 66.0	India (Tamil Nadu)	Troodontidae indet. (153666)
Late/Upper Maastrichtian	72.2 - 66.0	USA (New Mexico)	Troodontidae indet. (59068)
Late/Upper Maastrichtian	72.2 - 66.0	Romania (Hunedoara)	Troodontidae indet. (26369 27894 193944 219176)
Late/Upper Maastrichtian	72.2 - 66.0	USA (Montana)	Pectinodon sp. (183109) Stenonychosaurus inequalis (142326)
Late/Upper Maastrichtian	72.2 - 66.0	USA (South Dakota)	Troodon sp., Pectinodon bakkeri (224484) Troodontidae indet. (47034)
Late/Upper Maastrichtian	72.2 - 66.0	Spain (Cataluña)	Tamarro insperatus (38893)
Late/Upper Maastrichtian	72.2 - 66.0	Russian Federation (Chukot)	Troodon sp. (59386) Troodontidae indet. sp. 1, Troodontidae indet. sp. 2 (86529)
Late/Upper Maastrichtian	72.2 - 66.0	Russian Federation (Amur)	Troodon sp. (38134 47029)
Late/Upper Maastrichtian	72.2 - 66.0	USA (Wyoming)	Troodon formosus (26760) Troodon sp., Saurornithoides sp., Pectinodon bakkeri (14585)
Maastrichtian	72.2 - 66.0	Portugal (Coimbra)	Troodontidae indet. (49276)
Maastrichtian	72.2 - 66.0	Portugal (Aveiro)	Troodontidae indet. (75866)
Maastrichtian	72.2 - 66.0	Mongolia (Omnogov)	Saurornithoides junior (52012) Saurornithoides sp. (37020 168988) Troodontidae indet. (51972)
Maastrichtian	72.2 - 66.0	China (Heilongjiang)	Troodon sp. (37811)
Late/Upper Maastrichtian - Danian	72.2 - 61.66	Slovenia (Obalno-Kraska)	Troodontidae indet. (67198)