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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Pachycephalosaurinae
Taxonomy
Pachycephalosaurinae was named by Sereno (1997) [nomen nudum here]. It is not extant. It was considered monophyletic by Sereno (2000).
It was assigned to Pachycephalosauridae by Sereno (1997), Sereno (1998), Sereno (1999), Sereno (2000), Sullivan (2003), Williamson and Carr (2003), Gangloff et al. (2005), Williamson and Carr (2006), Williamson et al. (2009) and Woodruff et al. (2021).
It was assigned to Pachycephalosauridae by Sereno (1997), Sereno (1998), Sereno (1999), Sereno (2000), Sullivan (2003), Williamson and Carr (2003), Gangloff et al. (2005), Williamson and Carr (2006), Williamson et al. (2009) and Woodruff et al. (2021).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1997 | Pachycephalosaurinae Sereno p. 443 |
| 1998 | Pachycephalosaurinae Sereno p. 62 |
| 1999 | Pachycephalosaurinae Sereno p. 2138 fig. 2 |
| 2000 | Pachycephalosaurinae Sereno p. 482 |
| 2003 | Pachycephalosaurinae Sullivan p. 189 |
| 2003 | Pachycephalosaurinae Williamson and Carr fig. 11 |
| 2005 | Pachycephalosaurinae Gangloff et al. |
| 2006 | Pachycephalosaurinae Williamson and Carr p. 323 |
| 2009 | Pachycephalosaurinae Williamson et al. p. 291 |
| 2021 | Pachycephalosaurinae Woodruff et al. p. 588 fig. 14 |
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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.
Subfm. †Pachycephalosaurinae Sereno 1997
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G. †Sphaerotholus Williamson and Carr 2003
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†Sphaerotholus buchholtzae Williamson and Carr 2003
†Sphaerotholus edmontonensis Brown and Schlaikjer 1943
†Sphaerotholus goodwini Williamson and Carr 2003
†Sphaerotholus lyonsi Woodruff et al. 2023
†Sphaerotholus triregnum Woodruff et al. 2023
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Marsh 1875 | |||||
Age range: base of the Campanian to the top of the Late/Upper Maastrichtian or 83.60000 to 66.00000 Ma
Collections (13 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Santonian | Canada (Alberta) | Acrotholus audeti (125521) | |
| Campanian | Canada (Alberta) | Stegoceras brevis (64649 64650 64651) | |
| Late/Upper Campanian | USA (New Mexico) | Pachycephalosauria indet. (53515) | |
| Late/Upper Campanian | Canada (Alberta) | Sphaerotholus lyonsi (233410) Stegoceras brevis, Stegoceras validus (60877) | |
| Late/Upper Campanian - Maastrichtian | Canada (Alberta) | Troodon edmontonensis (64653) | |
| Maastrichtian | USA (Montana) | Stegoceras edmontonense (53516) | |
| Late/Upper Maastrichtian | Canada (Saskatchewan) | Pachycephalosaurinae indet. (223799) Sphaerotholus buchholtzae (170675) | |
| Late/Upper Maastrichtian | USA (Montana) | Platytholus clemensi (230093) Sphaerotholus triregnum (152397) |