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Allosaurus jimmadseni
Taxonomy
Allosaurus jimmadseni was named by Chure et al. (2006). Its type specimen is DINO 11541, a skeleton, and it is a 3D body fossil. Its type locality is DNM 116, N.A.A. Quarry, which is in a Kimmeridgian coarse channel fill conglomerate/sandstone in the Morrison Formation of Utah.
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Allosaurus jimmadseni Chure et al. p. 236 |
| 2010 | Allosaurus jimmadseni Galiano and Albersdörfer p. 5 |
| 2010 | Allosaurus jimmadsoni Galiano and Albersdörfer p. 5 |
| 2012 | Allosaurus jimmadseni Carrano et al. p. 223 |
| 2014 | Allosaurus jimmadseni Cobos et al. p. 39 |
| 2014 | Allosaurus jimmadseni Dalman p. 161 |
| 2020 | Allosaurus jimmadseni Chure and Loewen pp. 8, 20–22 figs. Figures 1–16 |
| 2020 | Allosaurus jimmadseni Foster et al. p. 41 |
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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.
†Allosaurus jimmadseni Chure et al. 2006
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. J. Chure and M. A. Loewen 2020 | Allosaurus jimmadseni is distinguished from other basal tetanurans by the following unique combination of characters: (1) in lateral view, a row of neurovascular foramina pierce the medioventral wall of the maxillary antorbital fossa; (2) straight posteroventral jugal ramus of maxilla where it articulates with jugal; (3) laterodorsal margin of nasal “pinched” into low crest continuous from premaxilla to lacrimal; (4) posterior portion of dorsal surface of nasal cup-shaped, producing a median peak in region of nasofrontal contact; (5) relatively taller lacrimal horns than in Allosaurus fragilis; (6) jugal with relatively straight ventral margin and straight-to-slightly-curved outline in dorsal view; a well-developed distinct antarticular, and (7) axial intercentrum is rotated dorsally and has a flared rim in lateral view. |
Measurements
No measurements are available
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| Source: g = genus, o = order | |||||
| References: Marsh 1875, Peczkis 1995 | |||||
Age range: base of the Late/Upper Kimmeridgian to the top of the Kimmeridgian or 155.70000 to 152.10000 Ma
Collections (7 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Oxfordian - Early/Lower Kimmeridgian | USA (Wyoming) | Allosaurus jimmadsoni (126540) | |
| Kimmeridgian | USA (Utah) | Allosaurus sp. (type locality: 193250) | |
| Kimmeridgian | USA (Wyoming) | Allosaurus fragilis (46468) Allosaurus jimmadseni (46469) Allosaurus sp. (46465) | |
| Kimmeridgian - Tithonian | USA (Wyoming) | Allosaurus jimmadseni (49636) | |
| Late/Upper Kimmeridgian - Early/Lower Tithonian | USA (Colorado) | Allosaurus fragilis (45975) |