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Colepiocephale lambei
Taxonomy
Stegoceras lambei was named by Sternberg (1945). Its type specimen is NMC 8818, a skull, and it is a 3D body fossil. Its type locality is Bow Island Ferry (NMC), which is in a Campanian terrestrial horizon in the Foremost Formation of Canada. It is the type species of Colepiocephale.
It was synonymized subjectively with Stegoceras validum by Sues and Galton (1987), Maryanska (1990), Maryanska et al. (2004), Currie (2005); it was recombined as Colepiocephale lambei by Sullivan (2003), Sullivan (2006), Schott et al. (2009), Longrich et al. (2010), Longrich (2013), Mallon et al. (2015), Goodwin and Evans (2016), Schott and Evans (2017), Evans et al. (2018), Woodruff et al. (2021), Wick and Lehman (2024).
It was synonymized subjectively with Stegoceras validum by Sues and Galton (1987), Maryanska (1990), Maryanska et al. (2004), Currie (2005); it was recombined as Colepiocephale lambei by Sullivan (2003), Sullivan (2006), Schott et al. (2009), Longrich et al. (2010), Longrich (2013), Mallon et al. (2015), Goodwin and Evans (2016), Schott and Evans (2017), Evans et al. (2018), Woodruff et al. (2021), Wick and Lehman (2024).
Synonymy list
| Year | Name and author |
|---|---|
| 1945 | Stegoceras lambei Sternberg p. 537 |
| 1964 | Stegoceras lambei Kuhn p. 32 |
| 1964 | Stegoceras lambei Russell p. 13 |
| 1967 | Stegoceras lambei Charig p. 716 |
| 2003 | Colepiocephale lambei Sullivan p. 189 fig. 3 |
| 2003 | Stegoceras lambei Williamson and Carr fig. 11 |
| 2006 | Colepiocephale lambei Sullivan p. 352 |
| 2009 | Colepiocephale lambei Schott et al. pp. 772-774 |
| 2010 | Stegoceras lambei Lehman p. 788 |
| 2010 | Colepiocephale lambei Longrich et al. p. 280 |
| 2013 | Colepiocephale lambei Longrich p. 52 |
| 2015 | Colepiocephale lambei Mallon et al. p. 429 |
| 2016 | Colepiocephale lambei Goodwin and Evans p. 2 |
| 2017 | Colepiocephale lambei Schott and Evans p. 868 |
| 2018 | Colepiocephale lambei Evans et al. p. 129 |
| 2021 | Colepiocephale lambei Woodruff et al. p. 581 |
| 2024 | Colepiocephale lambei Wick and Lehman p. 90 |
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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.
†Colepiocephale lambei Sternberg 1945
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. M. Sternberg 1945 | Relatively large form; skull short; face narrow and very steeply inclined; frontoparietal mass very thick, broad posteriorly and very narrow anteriorly; dome far back and overhanging occiput; no posterior shelf; posterior border steeply inclined. | |
| R. M. Sullivan 2003 | Nearly fully-domed pachycephalosaur; differs from all other pachycephalosaurs in: having no lateral (posterior supraorbital and postorbital) and no posterior squamosal shelf; squamosals restricted to lateral sides and much reduced, with only a hint of their margins lying ventrally under the parietal; parietal strongly down-turned, forming a steeply inclined border across entire posterior breadth of skull; occiput reduced; frontoparietal mass thick and broad posteriorly, medial frontal lobe high and relatively narrow; lateral frontal lobes recessed posteriorly; frontoparietal dome with pronounced constriction at contact of postorbital and posterior supraorbital (viewed dorsally); peripheal elements (postorbital, posterior supraorbital, anterior supraorbital and prefrontal) reduced and situated low along the frontoparietal; differs further from Stegoceras validum in lacking supratemporal fossae; differs further from Prenocephale edmontonense in having incipient anterior supraorbitals, which are not incorporated into the anterolateral (frontal) part of the dome.imens of this taxon and was unable to refer them to this species. | |
| R. K. Schott et al. 2009 | Pachycephalosaurid dinosaur characterized by the following autapomorphies: a frontoparietal dome that reaches its greatest width near posterior margin of sutural surface for postorbital; inflated parietal region of dome overhangs anterior margin of supratemporal fenestrae; sutural surface for postorbital highly arched such that there is a diastema between sutural surfaces for postorbital and posterior supraorbital; diastema accompanied by an indentation in lateral wall of dome; narrow and high frontonasal boss flanked by supraorbital lobes positioned at posterior end of boss; supraorbital lobes highly distinct and columnar. Differs from Stegoceras validum and Hanssuesia sternbergi in the prominence of the supraorbital lobes and the posterodorsal inflation of the parietal. Differs from Prenocephale, Tylocephale, and Pachycephalosaurus in having open supratemporal fenestrae and a more prominent frontonasal boss. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Marsh 1875 | |||||
Age range: Middle Campanian or 83.60000 to 72.20000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Campanian | Canada (Alberta) | Stegoceras sp. (59378 59379) Troodon sp. (type locality: 64654) |