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Daspletosaurus horneri
Taxonomy
Daspletosaurus horneri was named by Carr et al. (2017). Its type specimen is MOR 590, a partial skeleton, and it is a 3D body fossil. Its type locality is Blacktail Creek North, MOR TM-072, which is in a Campanian crevasse splay mudstone in the Two Medicine Formation of Montana.
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Daspletosaurus horneri Carr et al. p. 3 fig. 1–2 |
| 2018 | Daspletosaurus horneri Dalman et al. p. 125 |
| 2018 | Daspletosaurus horneri McDonald et al. p. 2 |
| 2020 | Daspletosaurus horneri Yun p. 4 |
| 2021 | Daspletosaurus horneri Titus et al. p. 2 |
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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.
†Daspletosaurus horneri Carr et al. 2017
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. D. Carr et al. 2017 | Can be distinguished from all other derived tyrannosauroids, including Daspletosaurus torosus, by the presence of: a wide dental arcade at the front of the snout, where the maxillary and dentary tooth rows extend distinctly rostromedially and the rst interdental plate of the maxilla is narrow, which resembles those of the premaxilla where the tooth row is mediolaterally oriented; dentary distinctly bowed (convex) laterally; promaxillary sinus stopping between alveoli 3 and 4, as observed in medial view of the completely prepared pneumatic chamber; rostral end of the choana on the maxilla above alveolus 7; in ated dorsal surface of the lacrimal not reaching the medial edge of the bone; medial pneumatic recess of the lacrimal tall and narrow slot; concave upper half of orbital margin of the lacrimal; entire circumference of the pneumatic recess of the squamosal is undercut and clearly de ned; sinuous rostral edge in dorsal view of the dorsotemporal fossa on the frontal; joint surface for the squamosal on the parietal covers the base of the caudolateral process; and the tympanic ridge extends onto the prootic.
Several autapomorphies were obtained by the cladistic analysis; autapomorphies were not included in the data matrix, but several characters were optimized on the terminal branch of D. horneri. ese include a pneumatic foramen penetrating the lateral surface of the quadratojugal, shallow notch between the basal tubera, short epi- pophyses of the anterior cervicals, and the humerus is ~34% the length of the femur (for further comparisons see Supplementary Discussion S2 and Supplementary Fig. S2). |
Measurements
No measurements are available
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| Source: g = genus, subo = suborder, o = order | |||||
| References: Benton 1983, Peczkis 1995, Marsh 1875 | |||||
Age range: Late/Upper Campanian or 83.60000 to 72.20000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian | USA (Montana) | Daspletosaurus horneri (184945) Daspletosaurus sp. (68045) Theropoda indet. (13282) Tyrannosauridae indet. (type locality: 22652 22689) |