PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Stenonychosaurus

Reptilia - Troodontidae

Taxonomy

Stenonychosaurus was named by Sternberg (1932).

It was synonymized subjectively with Saurornithoides by Carpenter (1982); it was synonymized subjectively with Troodon by Gauthier (1986), Currie (1987), Paul (1988), Currie et al. (1990), Nessov (1995), Varricchio (1997), Rauhut (2003), Makovicky and Norell (2004), Currie (2005).

It was assigned to Coelurosauria by Kuhn (1939); to Theropoda by Parsch (1963), Tatarinov (1964), Romer (1966); to Theropoda by Romer (1956), Steel (1970); to Troodontidae by Russell (1969), Coulton (1976); to Dromaeosauridae by Ostrom (1969), Kurzanov (1976); to Coeluridae by Sternberg (1932), McIntosh (1981), Dodson (1983); to Saurornithoididae by Sues (1977), Sues (1978), Molnar (1980), Thulborn (1984), Russell (1984), Currie (1985), Clemens (1986), Barsbold (1988), Carroll (1988); and to Troodontinae by van der Reest and Currie (2017).

Species

S. inequalis

Synonymy list

Year	Name and author
1932	Stenonychosaurus Sternberg pp. 102-103 figs. pl. 2-3
1939	Stenonychosaurus Kuhn p. 51
1956	Stenonychosaurus Romer p. 618
1963	Stenonychosaurus Parsch p. 6
1964	Stenonychosaurus Tatarinov p. 540
1966	Stenonychosaurus Romer p. 370
1969	Stenonychosaurus Ostrom p. 148
1969	Stenonychosaurus Russell
1970	Stenonychosaurus Steel p. 44
1976	Stenonychosaurus Coulton p. 177
1976	Stenonychosaurus Kurzanov p. 361
1977	Stenonychosaurus Sues p. 591
1978	Stenonychosaurus Sues p. 399
1980	Stenonychosaurus Molnar p. 138
1981	Stenonychosaurus McIntosh p. 10
1983	Stenonychosaurus Dodson p. 95
1984	Stenonychosaurus Russell p. 24
1984	Stenonychosaurus Thulborn p. 132
1985	Stenonychosaurus Currie p. 1643
1986	Stenonychosaurus Clemens p. 79
1988	Stenonychosaurus Barsbold p. 19
1988	Stenonychosaurus Carroll
2017	Stenonychosaurus van der Reest and Currie p. 930–931

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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
—	Diapsida	()

Rank	Name	Author
—	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
subfamily	Troodontinae
genus	Stenonychosaurus

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.

G. †Stenonychosaurus Sternberg 1932

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†Stenonychosaurus inequalis Sternberg 1932

Diagnosis

No diagnoses are available

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

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: f = family, o = order

References: Marsh 1875, Holtz et al. 2000

Age range: base of the Late/Upper Campanian to the top of the Late/Upper Maastrichtian or 83.60000 to 66.00000 Ma

Collections (14 total)

Time interval	Ma	Country or state	Original ID and collection number
Late/Upper Campanian	83.6 - 72.2	Canada (Alberta)	S. inequalis (45753 59115 59131) Troodon formosus (46951)
Middle Campanian - Late/Upper Campanian	83.6 - 72.2	Canada (Alberta)	S. inequalis (179240 179241 179242 179243 179244 179245 179246 217170)
Lancian	72.2 - 66.0	USA (Wyoming)	Saurornithoides inequalis (14519)
Late/Upper Maastrichtian	72.2 - 66.0	USA (Montana)	S. inequalis (142326)