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Stenonychosaurus inequalis
Taxonomy
Stenonychosaurus inequalis was named by Sternberg (1932). Its type specimen is NMC 8539 and is a 3D body fossil. Its type locality is 1.5 miles southwest of mouth, Berry Creek, which is in a Campanian terrestrial horizon in the Dinosaur Park Formation of Canada.
It was recombined as Saurornithoides inequalis by Carpenter (1982); it was synonymized subjectively with Troodon formosus by Currie (1987), Paul (1988), Currie et al. (1990), Currie (1992), Varricchio (1997), Peng et al. (2001), Makovicky and Norell (2004), Currie (2005) and Norell et al. (2009); it was recombined as Troodon inequalis by Longrich (2008), Zanno et al. (2011), Evans et al. (2014) and Evans et al. (2017).
It was recombined as Saurornithoides inequalis by Carpenter (1982); it was synonymized subjectively with Troodon formosus by Currie (1987), Paul (1988), Currie et al. (1990), Currie (1992), Varricchio (1997), Peng et al. (2001), Makovicky and Norell (2004), Currie (2005) and Norell et al. (2009); it was recombined as Troodon inequalis by Longrich (2008), Zanno et al. (2011), Evans et al. (2014) and Evans et al. (2017).
Synonymy list
| Year | Name and author |
|---|---|
| 1932 | Stenonychosaurus inequalis Sternberg |
| 1939 | Stenonychosaurus inequalis Kuhn p. 51 |
| 1951 | Stenonychosaurus inequalis Sternberg p. 258 |
| 1966 | Stenonychosaurus inequalis Russell p. 25 |
| 1969 | Stenonychosaurus inequalis Ostrom p. 148 |
| 1969 | Stenonychosaurus inequalis Russell p. 595 |
| 1970 | Stenonychosaurus inequalis Steel p. 44 |
| 1977 | Stenonychosaurus inequalis Sues p. 591 |
| 1978 | Stenonychosaurus inequalis Sues p. 395 |
| 1981 | Stenonychosaurus inequalis Lehman p. 203 |
| 1981 | Stenonychosaurus inequalis McIntosh p. 10 |
| 1981 | Stenonychosaurus inequalis Osmolska p. 89 |
| 1982 | Saurornithoides inequalis Carpenter p. 127 |
| 1985 | Stenonychosaurus inequalis Currie p. 1644 |
| 1985 | Stenonychosaurus inequalis Wilson and Currie p. 1813 |
| 1988 | Stenonychosaurus inequalis Rich et al. p. 1405 |
| 2008 | Troodon inequalis Longrich p. 994 |
| 2011 | Troodon inequalis Zanno et al. p. 2 |
| 2014 | Troodon inequalis Evans et al. p. 731 |
| 2017 | Troodon inequalis Evans et al. p. 814 |
| 2017 | Stenonychosaurus inequalis van der Reest and Currie p. 931 |
| 2022 | Stenonychosaurus inequalis Carr et al. |
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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.
†Stenonychosaurus inequalis Sternberg 1932
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. J. Currie 1985 | Medium-sized carnivorous dinosaur, closely related to Saurornithoides of Mongolia. It differs from both Saurornithoides mongoliensis Osborn 1924, and Saurornithoides junior Barsbold 1974 in that the anterior margin of maxillary fenestra is more rounded; sculpturing on surface of nasal process of maxilla does not extend as far posteriorly; the post-temporal region is longer relative to the height of the skull; the basioccipital tubers are much more pronounced; the lateral depression of the braincase is subdibided by a single vertical ridge rather than a pair of diverging ridges; the presphenoid is more anterior in relation to the laterosphenoid; there is no sulcus or trough on the ventral surface of the braincase posrterior to the parasphenoid capsule; and the supraoccipital seems to be narrower. | |
| A. J. van der Reest and P. J. Currie 2017 | A troodontid within Troodontinae that is distinguished from other troodontids by possessing a convex anterior surface metatarsal III, and an L-shaped frontal with a flat shallowly anteroposteriorly rippled nasofrontal contact. |