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Nanotyrannus lancensis
Taxonomy
Gorgosaurus lancensis was named by Gilmore (1946). Its type specimen is CMNH 7541, a skull, and it is a 3D body fossil. Its type locality is Sand Creek, Carter County (CMNH 7541), which is in a Maastrichtian terrestrial horizon in the Hell Creek Formation of Montana.
It was recombined as Aublysodon lancensis by Charig (1967); it was recombined as Albertosaurus lancensis by Russell (1970), Kurzanov (1976), Molnar (1978), Molnar (1980), Gauthier (1986), Paul (1988), Carpenter (1992); it was synonymized subjectively with Tyrannosaurus rex by Carr (1999), Holtz (2001), Rauhut (2003), Carr and Williamson (2004), Woodward et al. (2020); it was recombined as Nanotyrannus lancensis by Bakker et al. (1988), Molnar et al. (1990), Molnar (1991), Currie (1992), Currie et al. (2003), Currie (2003), Holtz (2004), DePalma et al. (2015), Dalman et al. (2018), Zanno and Napoli (2025).
It was recombined as Aublysodon lancensis by Charig (1967); it was recombined as Albertosaurus lancensis by Russell (1970), Kurzanov (1976), Molnar (1978), Molnar (1980), Gauthier (1986), Paul (1988), Carpenter (1992); it was synonymized subjectively with Tyrannosaurus rex by Carr (1999), Holtz (2001), Rauhut (2003), Carr and Williamson (2004), Woodward et al. (2020); it was recombined as Nanotyrannus lancensis by Bakker et al. (1988), Molnar et al. (1990), Molnar (1991), Currie (1992), Currie et al. (2003), Currie (2003), Holtz (2004), DePalma et al. (2015), Dalman et al. (2018), Zanno and Napoli (2025).
Synonymy list
| Year | Name and author |
|---|---|
| 1946 | Gorgosaurus lancensis Gilmore p. 2 |
| 1967 | Aublysodon lancensis Charig p. 714 |
| 1970 | Albertosaurus lancensis Russell p. 20 |
| 1970 | Gorgosaurus lancensis Steel p. 41 |
| 1970 | Gorgosaurus lancensis Tabrum p. 6 |
| 1976 | Albertosaurus lancensis Kurzanov |
| 1976 | Gorgosaurus lancensis Sloan p. 145 |
| 1978 | Albertosaurus lancensis Molnar p. 73 |
| 1980 | Albertosaurus lancensis Molnar pp. 102-103 |
| 1986 | Albertosaurus lancensis Gauthier p. 9 |
| 1988 | Nanotyrannus lancensis Bakker et al. |
| 1988 | Albertosaurus lancensis Paul p. 336 |
| 1990 | Nanotyrannus lancensis Molnar et al. p. 190 |
| 1991 | Nanotyrannus lancensis Molnar p. 167 |
| 1992 | Albertosaurus lancensis Carpenter p. 258 |
| 1992 | Nanotyrannus lancensis Currie p. 246 |
| 2003 | Nanotyrannus lancensis Currie |
| 2003 | Nanotyrannus lancensis Currie et al. p. 231 |
| 2004 | Nanotyrannus lancensis Holtz, Jr. p. 113 |
| 2006 | Nanotyrannus lencensis Malkani p. 8 |
| 2015 | Nanotyrannus lancensis DePalma et al. p. 12 |
| 2018 | Nanotyrannus lancensis Dalman et al. p. 136 |
| 2025 | Nanotyrannus lancensis Zanno and Napoli |
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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.
†Nanotyrannus lancensis Gilmore 1946
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| K. Carpenter 1992 | (Cranial) Skull long and low; maxillary fenestra small and separated from antorbital fenestra by a wide bar of the maxillary; antorbital fenestra longer than tall; nasals do not form a wedge between the frontals as in A. libratus and A. sarcophagus; in dorsal view, muzzle well differentiated from cranium so that there was stereoscopic vision. )Postcranial) fourth trochanter more proximal than in A. libratus; proximal articular face of tibia almost triangular, rather than quadrangular as in most tyrannosaurids (except for Maleevosaurus); proximal expansion of fibula is symmetrical relative to long axis of the shaft. |
Measurements
No measurements are available
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| Source: g = genus, subo = suborder, o = order | |||||
| References: Marsh 1875, Kiessling 2004, Benton 1983, Peczkis 1995 | |||||
Age range: Maastrichtian or 72.20000 to 66.00000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Maastrichtian | USA (South Dakota) | Nanotyrannus lancensis (224484) | |
| Late/Upper Maastrichtian | USA (Montana) | Gorgosaurus lancensis (14674) | |
| Late/Upper Maastrichtian | USA (Wyoming) | Nanotyrannus lancensis (230284) | |
| Maastrichtian | USA (Montana) | Gorgosaurus lancensis (type locality: 54002) |