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Saurornithoides

Reptilia - Avetheropoda - Troodontidae

Taxonomy
Saurornithoides was named by Osborn (1924). It is not extant. Its type is Saurornithoides mongoliensis. It was considered monophyletic by Currie (2000).

It was synonymized subjectively with Troodon by Paul (1988).

It was assigned to Megalosaurinidae by Osborn (1924); to Ornithomimidae by Huene (1927); to Coelurosauria by Huene (1958); to Compsognathidae by Huene (1959) and Tatarinov (1964); to Theropoda by Ostrom (1965); to Coeluridae by Romer (1956), Estes (1964), Romer (1966) and Steel (1970); to Dromaeosauridae by Ostrom (1969) and Santafé et al. (1982); to Saurornithoididae by Barsbold (1974), Sues (1977), Rozhdestvensky (1977), Bonaparte (1978), Sues (1978), Molnar (1978), Barsbold (1983), Thulborn (1984), Carroll (1988) and Dong (1992); to Troodontidae by Russell (1969), Gauthier (1986), Currie (1992), Russell and Dong (1994), Currie and Peng (1994), Chure (1994), Varricchio (1997), Barsbold (1997), Currie (2000), Norell et al. (2000), Currie and Dong (2001), Chiappe (2002), Rauhut (2003), Makovicky et al. (2003), Senter et al. (2004), Makovicky and Norell (2004), Norell and Hwang (2004), Smith (2007), Averianov and Sues (2007), Novas et al. (2008), Norell et al. (2009), Bever and Norell (2009), Chanthasit and Buffetaut (2009), Longrich et al. (2010), Lü et al. (2010), Zanno et al. (2011), Porfiri et al. (2011), Godefroit et al. (2013), Tsuihiji et al. (2014), Delcourt and Grillo (2014) and Williamson and Brusatte (2014); and to Troodontinae by van der Reest and Currie (2017).

Synonymy list
YearName and author
1924Saurornithoides Osborn pp. 3-7 figs. 3-5
1927Saurornithoides Huene p. 272
1956Saurornithoides Romer p. 612
1958Saurornithoides Huene p. 205
1959Saurornithoides Huene p. 121
1964Saurornithoides Estes p. 142
1964Saurornithoides Tatarinov p. 533
1965Saurornithoides Ostrom p. 39
1966Saurornithoides Romer p. 369
1969Saurornithoides Ostrom p. 148
1969Saurornithoides Russell
1970Saurornithoides Steel p. 16
1974Saurornithoides Barsbold p. 7
1977Saurornithoides Rozhdestvensky p. 112
1977Saurornithoides Sues p. 591
1978Saurornithoides Bonaparte p. 466
1978Saurornithoides Molnar p. 81 fig. 10
1978Saurornithoides Sues pp. 399-400
1982Saurornithoides Santafé et al. p. 82
1983Saurornithoides Barsbold p. 87
1984Saurornithoides Thulborn p. 132
1986Saurornithoides Gauthier p. 11
1988Saurornithoides Carroll
1992Saurornithoides Currie p. 238
1992Saurornithoides Dong p. 164
1994Saurornithoides Chure p. 14
1994Saurornithoides Currie and Peng p. 2225
1994Saurornithoides Russell and Dong p. 2169
1997Saurornithoides Barsbold p. 448
1997Saurornithoides Varricchio p. 749
2000Saurornithoides Currie p. 444
2000Saurornithoides Norell et al. p. 10 fig. 3
2001Saurornithoides Currie and Dong p. 1764
2002Saurornithoides Chiappe p. 460
2003Saurornithoides Makovicky et al. p. 25 fig. 21
2003Saurornithoides Rauhut p. 42
2004Saurornithoides Makovicky and Norell p. 185
2004Saurornithoides Norell and Hwang p. 7
2004Saurornithoides Senter et al. p. 2 fig. 2
2007Saurornithoides Averianov and Sues p. 95
2007Saurornithoides Smith p. 104
2008Saurornithoides Novas et al.
2009Saurornithoides Bever and Norell p. 7 fig. 6
2009Saurornithoides Chanthasit and Buffetaut p. 150
2009Saurornithoides Norell et al. p. 4
2010Saurornithoides Longrich et al. p. 955
2010Saurornithoides Lü et al. p. 382
2011Saurornithoides Porfiri et al. p. 112
2011Saurornithoides Zanno et al. p. 15 fig. 15
2013Saurornithoides Godefroit et al.
2014Saurornithoides Delcourt and Grillo p. 312
2014Saurornithoides Tsuihiji et al.
2014Saurornithoides Williamson and Brusatte p. 13
2017Saurornithoides van der Reest and Currie

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
RankNameAuthor
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Theropoda()
Neotheropoda
AverostraPaul 2002
Tetanurae
orderAvetheropoda
suborderCoelurosauria
Maniraptoriformes
familyTroodontidae
genusSaurornithoides

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.

Diagnosis
ReferenceDiagnosis
M. A. Norell et al. 2009Differs from Zanabazar junior in its smaller overall size, lower number of teeth (108 versus 118), the presence of a jugal that is straight beneath the round orbit rather than curved, and the possession of a pneumatic recess on the lateral surface of the prootic dorsal to the trigeminal fenestra (the pneumatic recess is also absent in Troodon formosus). The maxillary teeth of Saurornithoides exhibit some increase in crown height posteriorly but to a lesser degree than in Zanabazar junior. Also in contrast to Zanabazar junior, the maxillary teeth of Saurornithoides lack replacement gaps. In these latter two characters, Saurornithoides agrees with Mei long, Sinovenator changii, and basal avialans among paravians, whereas Zanabazar junior is more similar to Byronosaurus jaffei and dromaeosaurs.
Measurements
No measurements are available
Composition: hydroxyapatiteo
Entire body: yesg
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: 30 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: 2005-08-24 13:20:01
Modified: 2005-08-24 15:20:01
Source: g = genus, f = family, o = order
References: Holtz et al. 2000, Peczkis 1995, Marsh 1875

Age range: base of the Late/Upper Campanian to the top of the Lancian or 83.50000 to 66.00000 Ma

Collections (7 total)


Time interval Ma Country or state Original ID and collection number
Campanian83.6 - 72.1China (Nei Mongol) S. mongoliensis (46973)
Campanian83.6 - 72.1Mongolia (Omnogov Aimak) S. mongoliensis (37213)
Late/Upper Campanian83.5 - 70.6Mongolia (Omnogov) Ornithoides oshiensis (46152)
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0Mongolia (Omnogov) S. sp. (168988)
Lancian70.6 - 66.0USA (South Dakota) S. mongoliensis (14537 192251)
Late/Upper Maastrichtian70.6 - 66.0USA (Wyoming) S. sp. (14585)