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.
Specimen: † Triopticus primus (:TMM 31100-1030)

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 their
diversification 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.


Read the article »

Article DOI: 10.1016/j.cub.2016.07.066

Project DOI: 10.7934/P1187, http://dx.doi.org/10.7934/P1187
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 32 Taxa
  • 1 Specimen
  • 81 Characters
Total size of project's media files: 1 MB

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


    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Michelle Stocker
    Project Administrator
    Last logged in 09/22/16
    21117400447
    (350, 85, 12)
    000
    Matthew Brown
    Full membership
    Last logged in Never
    0000000
    (0, 0, 0)
    000
    Katharine Criswell
    Full membership
    Last logged in 05/06/15
    0003000
    (0, 0, 0)
    000
    Sterling Nesbitt
    Full membership
    Last logged in 09/22/16
    11004001858
    (1635, 159, 64)
    000
    Bill Parker
    Full membership
    Last logged in 11/25/14
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M5229' (32 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] † Protorosaurus speneri
    Last Modified in 10/24/14
    6727203005
    [2] † Malerisaurus langstoni
    Last Modified in 10/24/14
    15252271005
    [3] † Azendohsaurus madagaskarensis
    Last Modified in 11/06/15
    0797902005
    [4] † Prolacerta broomi
    Last Modified in 10/26/14
    3757503005
    [5] † Trilophosaurus buettneri
    Last Modified in 11/11/15
    2757504005
    [6] † Unnamed Loricatan
    Last Modified in 11/11/15
    60212100005
    [7] † Doswellia kaltenbachi
    Last Modified in 11/11/15
    36454500005
    [8] † Angistorhinus alticephalus
    Last Modified in 10/24/14
    18616120005
    [9] † Euparkeria capensis
    Last Modified in 10/24/14
    0818100005
    [10] † Triopticus primus
    Last Modified in 05/05/14
    11515650005
    [11] † Revueltosaurus callenderi
    Last Modified in 10/24/14
    1808000005
    [12] † Longosuchus meadei
    Last Modified in 10/24/14
    3767611005
    [13] † Poposaurus gracilis
    Last Modified in 10/24/14
    05959211005
    [14] † Effigia okeeffeae
    Last Modified in 10/24/14
    16464511005
    [15] † Asilisaurus kongwe
    Last Modified in 10/24/14
    16767112005
    [16] † Silesaurus opolensis
    Last Modified in 10/24/14
    0797911005
    [17] † Lesothosaurus diagnosticus
    Last Modified in 10/24/14
    10707001005
    [18] † Sauropelta edwardsorum
    Last Modified in 10/26/14
    125353142005
    [19] † Gastonia burgei
    Last Modified in 10/28/14
    24525241005
    [20] † Stegoceras validum
    Last Modified in 10/24/14
    28484841005
    [21] † Eoraptor lunensis
    Last Modified in 10/24/14
    5747411005
    [22] † Plateosaurus engelhardti
    Last Modified in 10/24/14
    0807901005
    [23] † Coelophysis bauri
    Last Modified in 10/24/14
    0808001005
    [24] † Limusaurus inextricabilis
    Last Modified in 04/29/15
    195151011005
    [25] † Allosaurus fragilis
    Last Modified in 10/24/14
    1797901005
    [26] † Baryonyx walkeri
    Last Modified in 10/28/14
    75353192005
    [27] † Spinosaurus aegyptiacus
    Last Modified in 10/24/14
    30484821005
    [28] † Ornithomimus edmontonicus
    Last Modified in 10/24/14
    16868012005
    [29] † Protosuchus richardsoni
    Last Modified in 10/24/14
    1767604005
    [30] † Calsoyasuchus valliceps
    Last Modified in 10/24/14
    101616550005
    [31] † Pelagosaurus typus
    Last Modified in 04/29/15
    16363125005
    [32] Gavialis gangeticus
    Last Modified in 09/22/16
    5737303005


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views11188
    Media views2121Media search (1761 views); M431892 (360 views);
    Matrix views985Matrix landing page (898 views); Archosaur disparity matrix (87 views);
    Project overview1156
    Taxon list5741
    Specimen list815
    Bibliography370




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project86
    Project downloads84
    Matrix downloads2Archosaur disparity matrix (2 downloads);