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Lythronax argestes
Taxonomy
Lythronax argestes was named by Loewen et al. (2013). Its type specimen is UMNH VP 20200, a partial skeleton, and it is a 3D body fossil. Its type locality is Nipple Butte (UMNH VP Loc. 1269), which is in a Campanian terrestrial mudstone in the Wahweap Formation of Utah. It is the type species of Lythronax.
Synonymy list
| Year | Name and author |
|---|---|
| 2013 | Lythronax argestes Loewen et al. p. 2 fig. 1,2,5 |
| 2015 | Lythronax argestes Peecook and Sidor p. 9 |
| 2016 | Lythronax argestes Holroyd and Hutchison p. 7 |
| 2017 | Lythronax argestes Carr et al. p. 9s |
| 2018 | Lythronax argestes McDonald 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.
†Lythronax argestes Loewen et al. 2013
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. A. Loewen et al. 2013 | Tyrannosaurid theropod diagnosed by the following autapomorphies: sigmoidal lateral margin of maxilla; ratio of transverse width of anterior portion of nasal to tranverse width of middle portion greater than 2.5; prefrontal and postorbital contact surfaces on frontal nearly in contact, separated only by very narrow, deep dorsoventral groove; presence of distinct suboccular flange on jugal. Lythronax is also diagnosed by the presence of the following unique combination of characters: differs from Alioramus and all other tyrannosauroids except Teratophoneus and Bistahieversor in the presence of 11 maxillary alveoli; differs from Appalachiosaurus, Alioramus and all other tyrannosauroids except Bistahieversor, Tyrannosaurus and Tarbosaurus in having a concave lateral margin of dentary and a broad postorbital process of jugal (relative to total jugal length); differs from all other tyrannosauroids except Tyrannosaurus and Tarbosaurus in having a laterally expanded caudal portion of the skull, such that the orbits are directed rostrodorsally; differs from Gorgosaurus, Albertosaurus and Teratophoneus in having a large, distally expanded pubic boot (with an anterioposterior length at least 60% of total pubic length); and differs from Teratophoneus, Bistahieversor, Tyrannosaurus and Tarbosaurus in possessing a dorsally expanded ascending process of the astragalus (with the height of the ascending process greater than the width of the astragalus and calcaneum). |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Marsh 1875, Benton 1983 | |||||
Age range: Early/Lower Campanian or 83.50000 to 70.60000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Campanian | USA (Utah) | Lythronax argestes (type locality: 230917) |