Project 3384: A. D. Marsh, W. G. Parker, M. C. Langer, S. J. Nesbitt. 2019. Redescription of the holotype specimen of Chindesaurus bryansmalli Long and Murry, 1995 (Dinosauria, Theropoda), from Petrified Forest National Park, Arizona. Journal of Vertebrate Paleontology. 39:e1645682.
Specimen: † Chindesaurus bryansmalli (PEFO:PEFO 10395)
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Abstract

Chindesaurus bryansmalli is an early dinosaur of uncertain affinities from the Late Triassic Chinle Formation at Petrified Forest National Park, Arizona. Since its first description in 1995, the taxon has been considered a plateosaurid, a non-eusaurischian saurischian, a herrerasaurid, and/or a non-neotheropod member of Theropoda. Chindesaurus bryansmalli is usually scored for about 25% of the characters in a given phylogenetic analysis and many characters have been scored second-hand from misidentified elements. Here we provide a redescription of the holotype specimen of Chindesaurus bryansmalli, correct misidentifications, introduce previously unknown elements, and discuss novel morphological character observations. Chindesaurus bryansmalli is supported as the sister taxon to the non-neotheropod theropod Tawa hallae from the Chinle Formation at Ghost Ranch, New Mexico. The same two most parsimonious trees, with increasing node support, result from iteratively removing the three most incomplete taxa in the employed dataset, suggesting that the relationships of stem-averostran theropods is not highly affected by the inclusion of fragmentary specimens. The Chindesaurus + Tawa clade recovered here may represent a potentially diverse group of early theropods prior to the end-Triassic mass extinction.


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Article DOI: 10.1080/02724634.2019.1645682

Project DOI: 10.7934/P3384, http://dx.doi.org/10.7934/P3384
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 16 Documents
  • 45 Taxa
  • 2 Specimens
  • 352 Characters
Total size of project's media files: 205.14k

Download Project SDD File
Total scored cells: 9643
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 352
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 789
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:352/0
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MorphoBank Project 3384

    Authors' Institutions

    • Museum of Northern Arizona, Flagstaff

    • Petrified Forest National Park, Navajo County

    • University of Texas at Austin

    • Virginia Tech (Virginia Polytechnic Institute and State University)

    • Universidade de Sao Paulo (USP, University of Sao Paulo)



    Members

    member name taxa specimens media chars character
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    (scored, NPA, "-")
    cell
    medialabels
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    Adam Marsh
    Project Administrator
    Last logged in 03/09/20
    1210000
    (0, 0, 0)
    000
    MorphoBank Curator
    Full membership
    Last logged in 04/01/20
    4400352009643
    (9643, 0, 0)
    000
    MorphoBank Curator
    Full membership
    Last logged in 07/27/20
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M26561' (45 Taxa)

    taxon unscored
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    [1] † Erythrosuchus africanus
    Last Modified in 04/01/20
    4330930900003
    [2] † Euparkeria capensis
    Last Modified in 04/01/20
    1933433300003
    [3] † Revueltosaurus callenderi
    Last Modified in 04/01/20
    4830430400003
    [4] † Aetosaurus ferratus
    Last Modified in 04/01/20
    12023323200003
    [5] † Arizonasaurus babbitti
    Last Modified in 04/01/20
    15519719700003
    [6] † Effigia okeeffeae
    Last Modified in 04/01/20
    8826426400003
    [7] † Batrachotomus kuperferzellensis
    Last Modified in 04/01/20
    5729529500003
    [8] † Postosuchus kirkpatricki
    Last Modified in 04/01/20
    6229029000003
    [9] † Dromicosuchus grallator
    Last Modified in 04/01/20
    12223023000003
    [10] † Eudimorphodon ranzii
    Last Modified in 04/01/20
    17717517500003
    [11] † Dimorphodon macronyx
    Last Modified in 04/01/20
    15619619600003
    [12] † Lagerpeton chanarensis
    Last Modified in 04/01/20
    21313913900003
    [13] † Dromomeron romeri
    Last Modified in 04/01/20
    281717100003
    [14] † Dromomeron gregorii
    Last Modified in 04/01/20
    304484800003
    [15] † Marasuchus lilloensis
    Last Modified in 04/01/20
    15719619500003
    [16] † Eucoelophysis baldwini
    Last Modified in 04/01/20
    323292900003
    [17] † Sacisaurus agudoensis
    Last Modified in 04/01/20
    2541009800003
    [18] † Silesaurus opolensis
    Last Modified in 04/01/20
    5929429300003
    [19] † Eocursor parvus
    Last Modified in 04/01/20
    21813413400003
    [20] † Pisanosaurus mertii
    Last Modified in 04/01/20
    257959500003
    [21] † Heterodontosaurus tucki
    Last Modified in 04/01/20
    6229229000003
    [22] † Lesothosaurus dianosticus
    Last Modified in 04/01/20
    7228028000003
    [23] † Scutellosaurus lawleri
    Last Modified in 04/01/20
    17817517400003
    [24] † Saturnalia tupiniquim
    Last Modified in 04/01/20
    15620019600003
    [25] † Plateosaurus engelhardti
    Last Modified in 04/01/20
    1833533400003
    [26] † Efraasia minor
    Last Modified in 04/01/20
    6428828800003
    [27] † Herrerasaurus ischigualastensis
    Last Modified in 04/01/20
    3931431300003
    [28] † Staurikosaurus pricei
    Last Modified in 04/01/20
    22213013000003
    [29] † Chindesaurus bryansmalli
    Last Modified in 04/01/20
    264898800003
    [30] † Eoraptor lunensis
    Last Modified in 04/01/20
    9525825700003
    [31] † Tawa hallae
    Last Modified in 04/01/20
    4730530500003
    [32] † Coelophysis bauri
    Last Modified in 04/01/20
    2732632500003
    [33] † Syntarsus kayentakatae
    Last Modified in 04/01/20
    9625625600003
    [34] † Liliensternus liliensterni
    Last Modified in 04/01/20
    14820620400003
    [35] † Zupaysaurus rougieri
    Last Modified in 04/01/20
    24011211200003
    [36] † Dilophosaurus wetherelli
    Last Modified in 04/01/20
    4930330300003
    [37] † Cryolophosaurus ellioti
    Last Modified in 04/01/20
    21513713700003
    [38] † Ceratosaurus nasicornis
    Last Modified in 04/01/20
    7427827800003
    [39] † Piatnitzkysaurus floresi
    Last Modified in 04/01/20
    17717517500003
    [40] † Allosaurus fragilis
    Last Modified in 04/01/20
    2133133100003
    [41] † Velociraptor mongoliensis
    Last Modified in 04/01/20
    6328928900003
    [42] † Camposaurus arizonensis
    Last Modified in 04/01/20
    323292900003
    [43] † Coelophysis rhodesiensis
    Last Modified in 04/01/20
    2532732700003
    [44] † Lepidus praecisio holotpye
    Last Modified in 04/01/20
    302515000003
    [45] † Eodromaeus murphi
    Last Modified in 04/01/20
    13422421800003


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views1776
    Project overview297
    Documents list218
    Media views372Media search (319 views); M657130 (53 views);
    Taxon list403
    Views for media list104
    Specimen list210
    Bibliography79
    Matrix views93Matrix from the publication of Marsh et al. 2019 (prepared by MorphoBank curators from original submission) (20 views); Matrix landing page (73 views);




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project78
    Document downloads35Supplementary Data 2 (8 downloads); Marsh et al Chindesaurus matrix (4 downloads); PEFO 10395 proximal left femur (3 downloads); PEFO 10395 right femur (5 downloads); PEFO 10395 cervical centrum (2 downloads); PEFO 10395 anterior caudal vertebra (2 downloads); Morphology matrix in Excel format (1 download); PEFO 10395 astragalus (1 download); PEFO 10395 caudal vertebra A (1 download); PEFO 10395 caudal vertebra B (1 download); PEFO 10395 dorsal centrum (1 download); PEFO 10395 proximal right tibia (2 downloads); PEFO 10395 right tibia distal (2 downloads); PEFO 10395 sacral vertebra 1 (1 download); PEFO 10395 sacral vertebra 2 (1 download);
    Project downloads40
    Media downloads1M657130 (1 download);
    Matrix downloads2Matrix from the publication of Marsh et al. 2019 (prepared by MorphoBank curators from original submission) (2 downloads);