Project 854: A. P. Pritchard,A. H. Turner,S. J. Nesbitt,R. B. Irmis,N. D. Smith. 2015. Late Triassic tanystropheids (Reptilia, Archosauromorpha) from northern New Mexico (Petrified Forest Member, Chinle Formation) and the biogeography, functional morphology, and evolution of Tanystropheidae. Journal of Vertebrate Paleontology. 35 (2).
Specimen: † Tanystropheus longobardicus (MCSN/BES SC:1018)
View: skull

Abstract

We report on tanystropheids from the Late Triassic (middle Norian) Hayden Quarry of northern New Mexico (Chinle Formation, Hayden Quarry). These elements, consisting of isolated vertebrae and appendicular bones, represent the first unambiguously identified tanystropheid from western North America and likely the latest occurrence of the group, post-dating Tanytrachelos in the Eastern United States. A new phylogenetic analysis of early saurians identifies apomorphies of tanystropheid subclades, which are recognized in the recovered vertebrae and a calcaneum. The femora are consistent with referral to Tanystropheidae. However, there is no clear association between the remains so we refrain from erecting a new taxon. The analysis also indicates that the Hayden Quarry tanystropheid fossils belong to a newly recognized subclade including the Late Triassic taxa Langobardisaurus and Tanytrachelos. As most tanystropheid specimens are two-dimensionally crushed skeletons, the Hayden Quarry tanystropheid fossils provide valuable insights into the three-dimensional osteology of derived tanystropheids. The most striking feature of the vertebrae in this group is a rugose, flattened expansion of the neural spines in the dorsal, sacral, and caudal regions. Based on comparisons with living and fossil taxa, we infer that tanystropheids may have developed a robust ligament system for the extension of the post-cervical vertebral column. These fossils and others from Late Triassic sites in the American West suggest that tanystropheids underwent a previously unrecognized radiation in North America just prior to their extinction.


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Article DOI: 10.1080/02724634.2014.911186

Project DOI: 10.7934/P854, http://dx.doi.org/10.7934/P854
This project containsMatrices
  • 4 Media
  • 1 Matrix
  • 34 Taxa
  • 4 Specimens
  • 201 Characters
Total size of project's media files: 2 MB

Download Project SDD File
Total scored cells: 3896
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 201
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 416
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:201/0
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MorphoBank Project 854

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    Members

    member name taxa specimens media chars character
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    (scored, NPA, "-")
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    Adam Pritchard
    Project Administrator
    Last logged in 04/07/15
    3300201003889
    (3689, 0, 200)
    000
    Maureen Admin
    Full membership
    Last logged in 04/09/15
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    (0, 0, 0)
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    MorphoBank Curator
    Full membership
    Last logged in 12/16/15
    1440000
    (0, 0, 0)
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    Sterling Nesbitt
    Full membership
    Last logged in 04/20/13
    0000007
    (7, 0, 0)
    000
    Nathan Smith
    Full membership
    Last logged in Never
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    Alan Turner
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    Taxonomic Overview for Matrix 'M1926' (33 Taxa)

    taxon unscored
    cells
    scored
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    no cell
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    NPA
    cells
    "-" cellscell images labels on
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    [1] † Petrolacosaurus kansasensis
    Last Modified in 12/05/13
    10179179012006
    [2] Uromastyx sp.
    Last Modified in 12/05/13
    5171171025006
    [3] † Trilophosaurus buettneri
    Last Modified in 12/05/13
    8178178015006
    [4] † Trilophosaurus jacobsi
    Last Modified in 12/05/13
    154454502006
    [5] † Prolacerta broomi
    Last Modified in 12/05/13
    1018718506006
    [6] † Teraterpeton hrynewichorum
    Last Modified in 12/05/13
    100989803006
    [7] † Protorosaurus speneri
    Last Modified in 12/05/13
    5314014008006
    [8] † Proterosuchus fergusi
    Last Modified in 12/05/13
    1518218204006
    [9] † Youngina capensis
    Last Modified in 12/05/13
    2616616609006
    [10] † Gephyrosaurus bridensis
    Last Modified in 12/05/13
    40150150011006
    [11] † Mesosuchus browni
    Last Modified in 12/05/13
    2017517407006
    [12] † Rhynchosaurus articeps
    Last Modified in 12/05/13
    33152152016006
    [13] † Langobardisaurus pandolfii
    Last Modified in 12/05/13
    108929201006
    [14] † Langobardisaurus tonelloi
    Last Modified in 12/05/13
    113878701006
    [15] † Langobardisaurus pandoflii concatenation
    Last Modified in 12/05/13
    9210810801006
    [16] † Tanystropheus longobardicus
    Last Modified in 12/15/13
    2317417305006
    [17] † Tanytrachelos ahynis
    Last Modified in 12/05/13
    7512212204006
    [18] Hayden Quarry Sacral
    Last Modified in 12/05/13
    1991101006
    [19] Hayden Quarry Tanystropheid
    Last Modified in 12/05/13
    160404001006
    [20] Hayden Quarry Femur
    Last Modified in 12/05/13
    1947700006
    [21] Hayden Quarry Dorsal
    Last Modified in 12/05/13
    190111100006
    [22] Hayden Quarry Cervical
    Last Modified in 12/05/13
    184171700006
    [23] Hayden Quarry Caudal
    Last Modified in 12/05/13
    1974400006
    [24] Hayden Quarry Calcaneum
    Last Modified in 12/05/13
    1956600006
    [25] † Macrocnemus bassanii
    Last Modified in 12/05/13
    4515215204006
    [26] † Macrocnemus fuyuanensis
    Last Modified in 12/05/13
    6113713703006
    [27] † Amotosaurus rotfeldensis
    Last Modified in 12/05/13
    143565602006
    [28] † Erythrosuchus africanus
    Last Modified in 12/05/13
    2616916906006
    [29] Shinisaurus crocodilurus
    Last Modified in 12/05/13
    2183183016006
    [30] † Orovenator mayorum
    Last Modified in 12/05/13
    127707004006
    [31] † Euparkeria capensis
    Last Modified in 12/05/13
    4215415405006
    [32] † Batrachotomus kupferzellensis
    Last Modified in 12/05/13
    26164163012006
    [33] † Teyumbaita sulcognathus
    Last Modified in 12/05/13
    66119119016006


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views23506
    Project overview3020
    Matrix views1985Matrix landing page (1774 views); Archosauromorph Phylogeny for HQ Tanystropheid Paper (211 views);
    Taxon list6121
    Bibliography3367
    Media views4849Media search (3174 views); M376576 (432 views); M376577 (419 views); M376578 (408 views); M376579 (416 views);
    Views for media list1834
    Specimen list2330




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project222
    Matrix downloads26Archosauromorph Phylogeny for HQ Tanystropheid Paper (26 downloads);
    Project downloads196