Project 1187: M. R. Stocker, S. J. Nesbitt, K. E. Criswell, W. G. Parker, L. M. Witmer, T. B. Rowe, R. Ridgely, M. A. Brown. 2016. A dome-headed stem archosaur exemplifies convergence among dinosaurs and their distant relatives. Current Biology. 26 (19):R887-R889.
Abstract
Similarities in body plan evolution, such as wings in pterosaurs, birds, and bats or limblessness in snakes and amphisbaenians, can be recognized as classical examples of convergence among animals. We introduce a new Triassic stem archosaur that is unexpectedly and remarkably convergent with the ‘‘dome headed’’ pachycephalosaur dinosaurs that lived over 100 million years later. Surprisingly, numerous additional taxa in the same assemblage (the Otis Chalk assemblage from the Dockum Group of Texas) demonstrate the early acquisition of morphological novelties that were later convergently evolved by post-Triassic dinosaurs. As one of the most successful clades of terrestrial vertebrates, dinosaurs came to occupy an extensive morphospace throughout theirdiversification in the Mesozoic Era, but their distant relatives were first to evolve many of those ‘‘dinosaurian’’ body plans in the Triassic Period. Our analysis of convergence between archosauromorphs from the Triassic Period and post-Triassic archosaurs demonstrates the early and extensive exploration of morphospace captured in a single Late Triassic assemblage, and we hypothesize that many of the ‘‘novel’’morphotypes interpreted to occur among archosaurs later in the Mesozoic already were in place during the initial Triassic archosauromorph, largely non-dinosaurian, radiation and only later convergently evolved in diverse dinosaurian lineages.
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Article DOI: 10.1016/j.cub.2016.07.066
Project DOI: 10.7934/P1187, http://dx.doi.org/10.7934/P1187
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 2305 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 81 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 168 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:80/1 |
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MorphoBank Project 1187
MorphoBank Project 1187
- Creation Date:
05 May 2014 - Publication Date:
22 September 2016 - Project views: 26491
- Matrix downloads: 7
Authors' Institutions
- Petrified Forest National Park, Navajo County
- Ohio University
- University of Cambridge
- University of Chicago
- University of Texas at Austin
- Virginia Tech (Virginia Polytechnic Institute and State University)
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
Michelle Stocker Project Administrator | 21 | 1 | 1 | 74 | 0 | 0 | 447 (350, 85, 12) | 0 | 0 | 0 | ||||
Matthew Brown Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | ||||
Katharine Criswell Full membership | 0 | 0 | 0 | 3 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | ||||
Sterling Nesbitt Full membership | 11 | 0 | 0 | 4 | 0 | 0 | 1858 (1635, 159, 64) | 0 | 0 | 0 | ||||
Bill Parker Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M5229' (32 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Protorosaurus speneri Last Modified in 10/24/14 | 6 | 72 | 72 | 0 | 3 | 0 | 0 | 5 |
[2] † Malerisaurus langstoni Last Modified in 10/24/14 | 1 | 52 | 52 | 27 | 1 | 0 | 0 | 5 |
[3] † Azendohsaurus madagaskarensis Last Modified in 11/06/15 | 0 | 79 | 79 | 0 | 2 | 0 | 0 | 5 |
[4] † Prolacerta broomi Last Modified in 10/26/14 | 3 | 75 | 75 | 0 | 3 | 0 | 0 | 5 |
[5] † Trilophosaurus buettneri Last Modified in 11/11/15 | 2 | 75 | 75 | 0 | 4 | 0 | 0 | 5 |
[6] † Unnamed Loricatan Last Modified in 11/11/15 | 60 | 21 | 21 | 0 | 0 | 0 | 0 | 5 |
[7] † Doswellia kaltenbachi Last Modified in 11/11/15 | 36 | 45 | 45 | 0 | 0 | 0 | 0 | 5 |
[8] † Angistorhinus alticephalus Last Modified in 10/24/14 | 18 | 61 | 61 | 2 | 0 | 0 | 0 | 5 |
[9] † Euparkeria capensis Last Modified in 10/24/14 | 0 | 81 | 81 | 0 | 0 | 0 | 0 | 5 |
[10] † Triopticus primus Last Modified in 05/05/14 | 1 | 15 | 15 | 65 | 0 | 0 | 0 | 5 |
[11] † Revueltosaurus callenderi Last Modified in 10/24/14 | 1 | 80 | 80 | 0 | 0 | 0 | 0 | 5 |
[12] † Longosuchus meadei Last Modified in 10/24/14 | 3 | 76 | 76 | 1 | 1 | 0 | 0 | 5 |
[13] † Poposaurus gracilis Last Modified in 10/24/14 | 0 | 59 | 59 | 21 | 1 | 0 | 0 | 5 |
[14] † Effigia okeeffeae Last Modified in 10/24/14 | 1 | 64 | 64 | 5 | 11 | 0 | 0 | 5 |
[15] † Asilisaurus kongwe Last Modified in 10/24/14 | 1 | 67 | 67 | 11 | 2 | 0 | 0 | 5 |
[16] † Silesaurus opolensis Last Modified in 10/24/14 | 0 | 79 | 79 | 1 | 1 | 0 | 0 | 5 |
[17] † Lesothosaurus diagnosticus Last Modified in 10/24/14 | 10 | 70 | 70 | 0 | 1 | 0 | 0 | 5 |
[18] † Sauropelta edwardsorum Last Modified in 10/26/14 | 12 | 53 | 53 | 14 | 2 | 0 | 0 | 5 |
[19] † Gastonia burgei Last Modified in 10/28/14 | 24 | 52 | 52 | 4 | 1 | 0 | 0 | 5 |
[20] † Stegoceras validum Last Modified in 10/24/14 | 28 | 48 | 48 | 4 | 1 | 0 | 0 | 5 |
[21] † Eoraptor lunensis Last Modified in 10/24/14 | 5 | 74 | 74 | 1 | 1 | 0 | 0 | 5 |
[22] † Plateosaurus engelhardti Last Modified in 10/24/14 | 0 | 80 | 79 | 0 | 1 | 0 | 0 | 5 |
[23] † Coelophysis bauri Last Modified in 10/24/14 | 0 | 80 | 80 | 0 | 1 | 0 | 0 | 5 |
[24] † Limusaurus inextricabilis Last Modified in 04/29/15 | 19 | 51 | 51 | 0 | 11 | 0 | 0 | 5 |
[25] † Allosaurus fragilis Last Modified in 10/24/14 | 1 | 79 | 79 | 0 | 1 | 0 | 0 | 5 |
[26] † Baryonyx walkeri Last Modified in 10/28/14 | 7 | 53 | 53 | 19 | 2 | 0 | 0 | 5 |
[27] † Spinosaurus aegyptiacus Last Modified in 10/24/14 | 30 | 48 | 48 | 2 | 1 | 0 | 0 | 5 |
[28] † Ornithomimus edmontonicus Last Modified in 10/24/14 | 1 | 68 | 68 | 0 | 12 | 0 | 0 | 5 |
[29] † Protosuchus richardsoni Last Modified in 10/24/14 | 1 | 76 | 76 | 0 | 4 | 0 | 0 | 5 |
[30] † Calsoyasuchus valliceps Last Modified in 10/24/14 | 10 | 16 | 16 | 55 | 0 | 0 | 0 | 5 |
[31] † Pelagosaurus typus Last Modified in 04/29/15 | 1 | 63 | 63 | 12 | 5 | 0 | 0 | 5 |
[32] Gavialis gangeticus Last Modified in 09/22/16 | 5 | 73 | 73 | 0 | 3 | 0 | 0 | 5 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 26491 | |
Media views | 4783 | Media search (4016 views); M431892 (767 views); |
Matrix views | 2093 | Matrix landing page (1870 views); Archosaur disparity matrix (223 views); |
Project overview | 2418 | |
Taxon list | 13936 | |
Specimen list | 2279 | |
Bibliography | 964 | |
Documents list | 18 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 229 | |
Project downloads | 222 | |
Matrix downloads | 7 | Archosaur disparity matrix (7 downloads); |