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Sphaerotholus buchholtzae
Taxonomy
Sphaerotholus buchholtzae was named by Williamson and Carr (2003). It is not extant. Its type specimen is RTMP 87.113.3. Its type locality is western Carter County, which is in a Maastrichtian terrestrial horizon in the Hell Creek Formation of Montana.
It was synonymized subjectively with Prenocephale edmontonensis by Sullivan (2003).
It was synonymized subjectively with Prenocephale edmontonensis by Sullivan (2003).
Synonymy list
| Year | Name and author |
|---|---|
| 2003 | Sphaerotholus buchholtzae Williamson and Carr |
| 2004 | Sphaerotholus buchholtzae Maryanska et al. p. 465 |
| 2009 | Sphaerotholus buchholtzae Williamson et al. p. 292 |
| 2010 | Sphaerotholus buchholtzae Longrich et al. p. 279 |
| 2012 | Sphaerotholus buchholtzae Schott and Evans p. 907 |
| 2015 | Sphaerotholus buchholtzae Mallon et al. p. 426 |
| 2017 | Sphaerotholus buchholtzae Schott and Evans p. 867 |
| 2018 | Sphaerotholus buchholtzae Evans et al. p. 124 |
| 2021 | Sphaerotholus buchholtzae Woodruff et al. pp. 582-583 |
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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.
†Sphaerotholus buchholtzae Williamson and Carr 2003
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. C. Woodruff et al. 2021 | Differs from all other pachycephalosaurids in the following unique combination of characters: a parietosquamosal bar that strongly decreases in depth laterally as seen in caudal view, the primary node row consists of four nodes with one small lateroventral corner node, wide intersquamosal process of the parietal that captures a medial portion of the medialmost primary node. Differs from S. edmontonensis (see below) in the relative length of the postorbital and parietal region of skull at similar frontoparietal size. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Marsh 1875 | |||||
Age range: Late/Upper Maastrichtian or 70.60000 to 66.00000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Maastrichtian | USA (Montana) | Stegoceras edmontonense (type locality: 53516) | |
| Late/Upper Maastrichtian | Canada (Saskatchewan) | Sphaerotholus buchholtzae (170675) |