Project 3508: J. W. Martz, B. J. Small. 2019. Non-dinosaurian dinosauromorphs from the Chinle Formation (Upper Triassic) of the Eagle Basin, northern Colorado: Dromomeron romeri (Lagerpetidae) and a new taxon, Kwanasaurus williamparkeri (Silesauridae). PeerJ. 7:e7551.
Specimen: † Kwanasaurus williamparkeri (DMNH:DMNH EPV.65879)
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Abstract

The “red siltstone” member of the Upper Triassic Chinle Formation in the Eagle Basin of Colorado contains a diverse assemblage of dinosauromorphs falling outside of Dinosauria. This assemblage is the northernmost known occurrence of non-dinosaurian dinosauromorphs in North America, and probably falls within the Revueltian land vertebrate estimated biochronozone (215-207 Ma, middle to late Norian). Lagerpetids are represented by proximal femora and a humerus referable to Dromomeron romeri. Silesaurids (non-dinosaurian dinosauriforms) are the most commonly recovered dinosauromorph elements, consisting of dentaries, maxillae, isolated teeth, humeri, illia, femora, and possibly a scapula and tibiae. These elements represent a new silesaurid, Kwanasaurus williamparkeri, gen. et sp. nov., which possesses several autapomorphies: a short, very robust maxilla with a broad ascending process, a massive ventromedial process, a complex articular surface for the lacrimal and jugal, and twelve teeth; fourteen dentary teeth; an ilium with an elongate and blade-like preacetabular process and concave acetabular margin; a femur with an extremely thin medial distal condyle and a depression on the distal end anterior to the crista tibiofibularis. The recognition of K. williamparkeri further demonstrates the predominantly Late Triassic diversity and widespread geographic distribution across Pangea of the sister clade to Asilisaurus, here named Sulcimentisauria. Silesaurid dentition suggests a variety of dietary specializations from faunivory and omnivory in the Middle Triassic and early Late Triassic (Carnian), to herbivory in the Late Triassic (Carnian and Norian), with the latter specialization coinciding with the radiation of Sulcimentisauria across Pangea. The extremely robust maxilla and folidont teeth of K. williamparkei may represent the most pronounced herbivorous dietary specialization known among silesaurids.


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Article DOI: 10.7717/peerj.7551

Project DOI: 10.7934/P3508, http://dx.doi.org/10.7934/P3508
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 39 Taxa
  • 1 Specimen
  • 294 Characters
Total size of project's media files: 1 MB

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Total scored cells: 6623
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 294
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 655
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:294/0
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MorphoBank Project 3508


    Members

    member name taxa specimens media chars character
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    (scored, NPA, "-")
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    Jeffrey Martz
    Project Administrator
    Last logged in 08/05/19
    3911294006623
    (6623, 0, 0)
    000


    Taxonomic Overview for Matrix 'M26167' (39 Taxa)

    taxon unscored
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    [1] † Erythrosuchus africanus
    Last Modified in 08/05/19
    3026426400001
    [2] † Euparkeria capensis
    Last Modified in 08/05/19
    1228328200001
    [3] † Revueltosaurus callenderi
    Last Modified in 08/05/19
    3126326300001
    [4] † Aetosaurus ferratus
    Last Modified in 08/05/19
    9819719600001
    [5] † Arizonasaurus babbitti
    Last Modified in 08/05/19
    11617817800001
    [6] † Effigia okeeffeae
    Last Modified in 08/05/19
    7322122100001
    [7] † Batrachotomus kuperferzellensis
    Last Modified in 08/05/19
    4325125100001
    [8] † Postosuchus kirkpatricki
    Last Modified in 08/05/19
    5224224200001
    [9] † Dromicosuchus grallator
    Last Modified in 08/05/19
    9220220200001
    [10] † Eudimorphodon ranzii
    Last Modified in 08/05/19
    15114314300001
    [11] † Dimorphodon macronyx
    Last Modified in 08/05/19
    13416016000001
    [12] † Lagerpeton chanarensis
    Last Modified in 08/05/19
    18311111100001
    [13] † Dromomeron gregorii
    Last Modified in 08/05/19
    257373700001
    [14] † Dromomeron romeri
    Last Modified in 08/05/19
    236585800001
    [15] † Marasuchus lilloensis
    Last Modified in 08/05/19
    13515915900001
    [16] † Lewisuchus/Pseudolagosuchus
    Last Modified in 08/05/19
    13515915900001
    [17] † Asilisaurus kongwe
    Last Modified in 08/05/19
    15114314300001
    [18] † Lutungutali sitwensis
    Last Modified in 08/05/19
    237575700001
    [19] † Eucoelophysis baldwini
    Last Modified in 08/05/19
    253414100001
    [20] † Sacisaurus agudoensis
    Last Modified in 08/05/19
    216787800001
    [21] † Silesaurus opolensis
    Last Modified in 08/05/19
    4624924800001
    [22] † Pisanosaurus mertii
    Last Modified in 08/05/19
    219757500001
    [23] † Heterodontosaurus tucki
    Last Modified in 08/05/19
    4924724500001
    [24] † Lesothosaurus dianosticus
    Last Modified in 08/05/19
    5723723700001
    [25] † Herrerasaurus ischigualastensis
    Last Modified in 08/05/19
    3825625600001
    [26] † Eoraptor lunensis
    Last Modified in 08/05/19
    9020520400001
    [27] † Saturnalia tupiniquim
    Last Modified in 08/05/19
    13615815800001
    [28] † Plateosaurus engelhardti
    Last Modified in 08/05/19
    1827627600001
    [29] † Efraasia minor
    Last Modified in 08/05/19
    5424024000001
    [30] † Tawa hallae
    Last Modified in 08/05/19
    4225225200001
    [31] † Coelophysis bauri
    Last Modified in 08/05/19
    2726726700001
    [32] † Dilophosaurus wetherelli
    Last Modified in 08/05/19
    4425025000001
    [33] † Allosaurus fragilis
    Last Modified in 08/05/19
    2127327300001
    [34] † Velociraptor mongoliensis
    Last Modified in 08/05/19
    5124324300001
    [35] † Kwanasaurus williamparkeri
    Last Modified in 08/05/19
    214818000001
    [36] † Technosaurus smalli
    Last Modified in 08/05/19
    28510900001
    [37] † Soumyasaurus aenigmaticus
    Last Modified in 08/05/19
    2868800001
    [38] † Diodorus scytobrachion
    Last Modified in 08/05/19
    257373700001
    [39] † Ignotosaurus fragilis
    Last Modified in 08/05/19
    282121200001


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views853
    Project overview143
    Media views152Media search (136 views); M675956 (16 views);
    Views for media list44
    Specimen list69
    Taxon list348
    Bibliography26
    Matrix views71Matrix landing page (52 views); Phylogenetic Analysis of Silesauridae (Dinosauriformes) (from Martz and Small, 2019, modified from Peecook et al., 2013). (19 views);




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project15
    Project downloads11
    Matrix downloads4Phylogenetic Analysis of Silesauridae (Dinosauriformes) (from Martz and Small, 2019, modified from Peecook et al., 2013). (4 downloads);