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Hanssuesia sternbergi
Taxonomy
Troodon sternbergi was named by Brown and Schlaikjer (1943). Its type specimen is NMC 8817, a skull, and it is a 3D body fossil. Its type locality is southeast of Steveville (NMC), which is in a Campanian terrestrial horizon in Canada.
It was recombined as Stegoceras sternbergi by Sternberg (1945), Kuhn (1964), Charig (1967), Eberth et al. (2001), Williamson and Carr (2003), Ryan and Evans (2005) and Williamson and Carr (2006); it was synonymized subjectively with Stegoceras validum by Sues and Galton (1987), Maryanska (1990) and Maryanska et al. (2004); it was recombined as Gravitholus sternbergi by Sullivan (2000); it was recombined as Hanssuessia sternbergi by Sullivan (2003); it was recombined as Hansuessia sternbergi by Longrich (2008); it was recombined as Hanssuesia sternbergi by Sullivan (2003), Sullivan (2006), Schott et al. (2009), Longrich et al. (2010), Schott and Evans (2012), Mallon et al. (2015), Schott and Evans (2017) and Woodruff et al. (2021).
It was recombined as Stegoceras sternbergi by Sternberg (1945), Kuhn (1964), Charig (1967), Eberth et al. (2001), Williamson and Carr (2003), Ryan and Evans (2005) and Williamson and Carr (2006); it was synonymized subjectively with Stegoceras validum by Sues and Galton (1987), Maryanska (1990) and Maryanska et al. (2004); it was recombined as Gravitholus sternbergi by Sullivan (2000); it was recombined as Hanssuessia sternbergi by Sullivan (2003); it was recombined as Hansuessia sternbergi by Longrich (2008); it was recombined as Hanssuesia sternbergi by Sullivan (2003), Sullivan (2006), Schott et al. (2009), Longrich et al. (2010), Schott and Evans (2012), Mallon et al. (2015), Schott and Evans (2017) and Woodruff et al. (2021).
Synonymy list
| Year | Name and author |
|---|---|
| 1943 | Troodon sternbergi Brown and Schlaikjer p. 131 |
| 1945 | Stegoceras sternbergi Sternberg p. 537 |
| 1964 | Stegoceras sternbergi Kuhn p. 31 |
| 1967 | Stegoceras sternbergi Charig p. 716 |
| 2000 | Gravitholus sternbergi Sullivan p. 72A |
| 2001 | Stegoceras sternbergi Eberth et al. p. 57 |
| 2003 | Hanssuessia sternbergi Sullivan p. 193 figs. 4-5 |
| 2003 | Hanssuesia sternbergi Sullivan p. 714 |
| 2003 | Stegoceras sternbergi Williamson and Carr |
| 2005 | Stegoceras sternbergi Ryan and Evans p. 320 |
| 2006 | Hanssuesia sternbergi Sullivan p. 353 |
| 2006 | Stegoceras sternbergi Williamson and Carr p. 323 |
| 2008 | Hansuessia sternbergi Longrich p. 994 |
| 2009 | Hanssuesia sternbergi Schott et al. p. 774 |
| 2010 | Hanssuesia sternbergi Longrich et al. p. 280 |
| 2012 | Hanssuesia sternbergi Schott and Evans p. 912 |
| 2015 | Hanssuesia sternbergi Mallon et al. p. 429 |
| 2017 | Hanssuesia sternbergi Schott and Evans p. 868 |
| 2021 | Hanssuesia sternbergi Woodruff et al. p. 580 |
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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.
†Hanssuesia sternbergi Brown and Schlaikjer 1943
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. M. Sullivan 2003 | Differs from all other pachycephalosaurs in having a low, depressed parietal region of the fronto-parietal dome, anterior (frontal) and posterior (parietal) portions of the frontoparietal wide; nasal boss of frontal broad with reduced, more inflated, lateral prefrontal lobes; and parietosquamosal shelf reduced. |