PBDB Taxon

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

Daspletosaurus

Osteichthyes - Tyrannosauridae

Taxonomy

Daspletosaurus was named by Russell (1970).

It was synonymized subjectively with Tyrannosaurus by Paul (1988); it was synonymized subjectively with Gorgosaurus by Carr (1995).

It was assigned to Carnosauria by Gauthier (1986); to Tyrannosauridae by Russell (1970), Kurzanov (1976), Lawson (1976), Molnar (1978), Molnar (1980), Molnar (1980), Barsbold (1983), Dodson (1983), Thulborn (1984), Russell (1984), Clemens (1986), Currie (1987), Carroll (1988), Kurzanov (1989), Molnar et al. (1990), Molnar (1991), Currie (1992), Carpenter (1992), Padian (1997), Eberth (1997), Sereno (1998), Holtz (1998), Carr (1999), Currie (2000), Eberth et al. (2001), Currie et al. (2003), Rauhut (2003), Urban and Lamanna (2006), Smith (2007), Longrich (2008), Li et al. (2009), Paulina Carabajal and Currie (2012), Dalman (2013), Lü et al. (2014); to Daspletosaurini by Voris et al. (2020), Yun (2020), Rivera-Sylva and Longrich (2024), Scherer and Voiculescu-Holvad (2024); and to Tyrannosaurinae by Holtz (1997), Currie (2000), Holtz (2001), Currie (2003), Currie et al. (2003), Holtz (2004), Erickson et al. (2004), Currie et al. (2005), Carr et al. (2005), Carr et al. (2011), Carr et al. (2017), Dalman et al. (2018), Coppock et al. (2024).

Species

D. horneri, D. torosus, D. wilsoni

Synonymy list

Year	Name and author
1970	Daspletosaurus Russell p. 13
1976	Daspletosaurus Kurzanov
1976	Daspletosaurus Lawson p. 160
1978	Daspletosaurus Molnar p. 75
1980	Daspletosaurus Molnar p. 102
1983	Daspletosaurus Barsbold p. 95
1983	Daspletosaurus Dodson p. 95
1984	Daspletosaurus Russell p. 25
1984	Daspletosaurus Thulborn p. 133
1986	Daspletosaurus Clemens p. 79
1986	Daspletosaurus Gauthier p. 9
1987	Daspletosaurus Currie p. 54
1988	Daspletosaurus Carroll
1989	Daspletosaurus Kurzanov p. 5
1990	Daspletosaurus Molnar et al. p. 190
1991	Daspletosaurus Molnar p. 166
1992	Daspletosaurus Carpenter pp. 260-1
1992	Daspletosaurus Currie p. 242
1997	Daspletosaurus Eberth p. 201
1997	Daspletosaurus Holtz, Jr. p. 53A
1997	Daspletosaurus Padian p. 532
1998	Daspletosaurus Holtz, Jr. p. 41
1998	Daspletosaurus Sereno p. 65
1999	Daspletosaurus Carr pp. 498-499
2000	Daspletosaurus Currie p. 273
2001	Daspletosaurus Eberth et al. p. 56
2001	Daspletosaurus Holtz, Jr. p. 70 fig. 7.2
2003	Daspletosaurus Currie p. 663
2003	Daspletosaurus Currie et al. p. 6
2003	Daspletosaurus Currie et al. p. 230 fig. 2
2003	Daspletosaurus Rauhut p. 43
2004	Daspletosaurus Erickson et al. p. 773
2004	Daspletosaurus Holtz, Jr. p. 112
2005	Daspletosaurus Carr et al. p. 140 fig. 21
2005	Daspletosaurus Currie et al. pp. 318-319
2006	Daspletosaurus Urban and Lamanna p. 234
2007	Daspletosaurus Smith p. 104
2008	Daspletosaurus Longrich p. 994
2009	Daspletosaurus Li et al.
2011	Daspletosaurus Carr et al.
2012	Daspletosaurus Paulina Carabajal and Currie p. 95
2013	Daspletosaurus Dalman p. 241
2014	Daspletosaurus Lü et al.
2017	Daspletosaurus Carr et al. p. 3
2018	Daspletosaurus Dalman et al. p. 125
2020	Daspletosaurus Voris et al.
2020	Daspletosaurus Yun p. 3
2024	Daspletosaurus Coppock et al. p. 1228
2024	Daspletosaurus Rivera-Sylva and Longrich p. 261
2024	Daspletosaurus Scherer and Voiculescu-Holvad

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
class	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	()
—	Saurischia	()
—	Theropoda	()
—	Neotheropoda
—	Averostra	Paul 2002
—	Tetanurae
—	Coelurosauria	()
superfamily	Tyrannosauroidea
family	Tyrannosauridae
subfamily	Tyrannosaurinae
—	Daspletosaurini
genus	Daspletosaurus

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. †Daspletosaurus Russell 1970

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†Daspletosaurus horneri Carr et al. 2017

†Daspletosaurus torosus Russell 1970

†Daspletosaurus wilsoni Warshaw and Fowler 2022

Diagnosis

Reference	Diagnosis
C. C. Coppock et al. 2024	Tyrannosaurines diagnosed by the following synapomorphies provided by Carr et al. (2017): subcutaneous surface of the maxilla is extremely coarse with deep sulci anterior to the antorbital fossa; presence of a laterally ex- pressed accessory cornual process of the lacrimal posterior to primary cornual process (found to be ontogenetically invariant herein); dorsal margin of the anterior ramus of the lacrimal concealed by subcutaneous surface in lateral view; cornual process of the postorbital closely approaches laterotemporal fenestra; anterior tip of the postorbital process of the squamosal is posterior to the anterior margin of the laterotemporal fenestra; nasal process of the frontal possesses an anteroposteriorly elongate ridge; deep keel-like flange below stem of vomer; primary recess opening of the palatine is in-line with, or posterior to, the anterior margin of the vomeropterygoid process neck; mediolaterally oriented ridge on dorsolateral surface of the laterosphenoid; rounded anterior margin of the dentary with the transition between anterior and ventral margins located ventral to alveoli 1–3; 13 or more maxillary teeth.

Measurements

part	N	mean
femur circumference	1	389.0
tibia circumference	1	347.0

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:

10000 kgg

Minimum body mass:

3000 kgg

Architecture:

compact or denseo

Ontogeny:

accretion, modification of partso

Grouping:

solitaryo

Environment:

terrestrialo

Locomotion:

actively mobileo

Life habit:

ground dwellingo

Diet:

carnivoresubo

Reproduction:

oviparouso

Dispersal:

direct/internalo

Dispersal 2:

mobileo

Created:

2005-08-24 13:11:18

Modified:

2005-08-24 15:11:18

Source: g = genus, subo = suborder, o = order

References: Benton 1983, Peczkis 1995, Kiessling 2004, Marsh 1875

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

Collections (20 total)

Time interval	Ma	Country or state	Original ID and collection number
Campanian	83.6 - 72.2	Canada (Alberta)	D. torosus (52481 52482)
Judithian	83.6 - 72.2	USA (Wyoming)	D. sp. (14458)
Late/Upper Campanian	83.6 - 72.2	USA (Montana)	D. horneri (184945) D. sp. (68045) D. sp., Tyrannosauridae indet. (22689) Theropoda indet. (13282) Tyrannosauridae indet. (22652)
Late/Upper Campanian	83.6 - 72.2	USA (New Mexico)	D. sp. (47195)
Late/Upper Campanian	83.6 - 72.2	Canada (Alberta)	D. n. sp. (162145) D. sp. (59004) D. torosus (11903 214293) Gorgosaurus sp. (167660) Theropoda indet. (11904)
Middle Campanian	83.6 - 72.2	USA (Montana)	D. sp. (36608) D. wilsoni (229345)
Middle Campanian	83.6 - 72.2	Canada (Alberta)	Gorgosaurus sp. (11915)
Middle Campanian - Late/Upper Campanian	83.6 - 72.2	Canada (Alberta)	D. sp. (52471)
Late/Upper Maastrichtian	72.2 - 66.0	USA (New Mexico)	Tyrannosauridae indet. (54100)