Project 4715: J. R. Horner, M. B. Goodwin, D. C. Evans. 2022. A new pachycephalosaurid from the Hell Creek Formation, Garfield County, Montana, U.S.A. Journal of Vertebrate Paleontology. 42 (4):null.
Abstract
A partial skull of a pachycephalosaurid from the Upper Cretaceous Hell Creek Formation, Montana, is interpreted as a new taxon, Platytholus clemensi gen. et sp. nov. MOR 2915 does not fit into an ontogenetic continuum of known pachycephalosaurids from the Hell Creek Formation, Montana, and contemporaneous sediments from the Western Interior. Comparisons to known ontogimorphs of Sphaerotholus and Pachycephalosaurus preclude including this specimen into an ontogenetic series of either taxon. We hypothesize that MOR 2915 is a new species based on a relatively low, broad dome at this advanced ontogenetic age that is neither round nor oval in dorsal view, distinct but fused lateral cranial elements fully incorporated into the dome without any dorsal lobe differentiation, and individual tab-like tubercle ornamentation dorsolaterally. Phylogenetic analysis posits that Platytholus clemensi is a Prenocephale-grade taxon deeply nested within Pachycephalosaurinae, but it is not a member of Pachycephalosaurini. Platytholus clemensi is intermediate in size between the other contemporaneous pachycephalosaurids in the Hell Creek Formation and suggests a diverse set of taxa-partitioned ecological niches by body size. We confirm a well organized, major internal vascular network using high resolution computed tomography. Foramina present on the orbital roofs indicate these canals penetrated the entire ceiling of the orbits within the frontal and supraorbital bones. Abundant neurovascular canals passing through the dome to the ectocranial surface indicate a keratinous structure of some kind, possibly with a vertical structural framework, was present on the dome. We review the history of the head-butting hypothesis and associated behavioral implications.Read the article »
Article DOI: 10.1080/02724634.2023.2190369
Project DOI: 10.7934/P4715, http://dx.doi.org/10.7934/P4715
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 541 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 51 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 112 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:51/0 |
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MorphoBank Project 4715
MorphoBank Project 4715
- Creation Date:
13 June 2023 - Publication Date:
10 August 2023 - Project views: 2197
Authors' Institutions
- Chapman University
- University of California Berkeley
- Royal Ontario Museum
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
MorphoBank Curator Project Administrator | 0 | 1 | 1 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M29404' (19 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Psittacosaurus mongoliensis Last Modified in 08/10/23 | 0 | 51 | 51 | 0 | 0 | 0 | 0 | 1 |
[2] † Yinlong downsi Last Modified in 08/10/23 | 6 | 45 | 45 | 0 | 0 | 0 | 0 | 1 |
[3] † Wannanosaurus yanshiensis Last Modified in 08/10/23 | 23 | 28 | 28 | 0 | 0 | 0 | 0 | 1 |
[4] † Goyocephale lattimorei Last Modified in 08/10/23 | 9 | 42 | 42 | 0 | 0 | 0 | 0 | 1 |
[5] † Homalocephale calathocercos Last Modified in 08/10/23 | 7 | 44 | 44 | 0 | 0 | 0 | 0 | 1 |
[6] † Tylocephale gilmorei Last Modified in 08/10/23 | 23 | 28 | 28 | 0 | 0 | 0 | 0 | 1 |
[7] † Prenocephale prenes Last Modified in 08/10/23 | 3 | 48 | 48 | 0 | 0 | 0 | 0 | 1 |
[8] † Foraminacephale brevis Last Modified in 08/10/23 | 24 | 27 | 27 | 0 | 0 | 0 | 0 | 1 |
[9] † Hanssuesia sternbergi Last Modified in 08/10/23 | 40 | 11 | 11 | 0 | 0 | 0 | 0 | 1 |
[10] † Colepiocephale lambei Last Modified in 08/10/23 | 42 | 10 | 9 | 0 | 0 | 0 | 0 | 1 |
[11] † Stegoceras validum Last Modified in 08/10/23 | 1 | 52 | 50 | 0 | 0 | 0 | 0 | 1 |
[12] † Pachycephalosaurus wyomingensis Last Modified in 08/10/23 | 17 | 34 | 34 | 0 | 0 | 0 | 0 | 1 |
[13] † Alaskacephale gangloffi Last Modified in 08/10/23 | 32 | 19 | 19 | 0 | 0 | 0 | 0 | 1 |
[14] † Sphaerotholus goodwini Last Modified in 08/10/23 | 22 | 29 | 29 | 0 | 0 | 0 | 0 | 1 |
[15] † Sphaerotholus edmontonensis Last Modified in 08/10/23 | 38 | 13 | 13 | 0 | 0 | 0 | 0 | 1 |
[16] † Sphaerotholus buchholtzae Last Modified in 08/10/23 | 24 | 27 | 27 | 0 | 0 | 0 | 0 | 1 |
[17] † Acrotholus audeti Last Modified in 08/10/23 | 38 | 13 | 13 | 0 | 0 | 0 | 0 | 1 |
[18] † Amtocephale gobienses Last Modified in 08/10/23 | 40 | 11 | 11 | 0 | 0 | 0 | 0 | 1 |
[19] † Platytholus clemensi Last Modified in 08/10/23 | 42 | 9 | 9 | 0 | 0 | 0 | 0 | 1 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 2197 | |
Project overview | 180 | |
Media views | 681 | Media search (614 views); M890605 (67 views); |
Matrix views | 108 | Matrix landing page (102 views); Data matrix from supplementary material (6 views); |
Bibliography | 95 | |
Views for media list | 130 | |
Specimen list | 233 | |
Taxon list | 769 | |
Documents list | 1 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 1 | |
Project downloads | 1 |