Project 977: E. Tschopp, O. Mateus. 2012. The skull and neck of a new flagellicaudatan sauropod from the Morrison Formation and its implication for the evolution and ontogeny of diplodocid dinosaurs. Journal of Systematic Palaeontology. 11 (7):853-888.
Specimen: † Kaatedocus siberi (SMA:0004)
View: anterolateral

Abstract

A new taxon of diplodocid sauropod, Kaatedocus siberi gen. et sp. nov., is recognized based on well-preserved cervical vertebrae and skull from the Morrison Formation (Kimmeridgian, Late Jurassic) of northern Wyoming, USA. A phylogenetic analysis places it inside Diplodocinae (Sauropoda: Flagellicaudata: Diplodocidae), as a sister taxon to a clade uniting Tornieria africana and the classical diplodocines Barosaurus lentus and Diplodocus. The taxon is diagnosed by a unique combination of plesiomorphic and derived traits, as well as the following unambiguous autapomorphies within Diplodocidae: frontals separated anteriorly by a U-shaped notch; squamosals restricted to the post-orbital region; presence of a postparietal foramen; a narrow, sharp and distinct sagittal nuchal crest; the paired basal tuber with a straight anterior edge in ventral view; anterior end of the prezygapophyses of mid- and posterior cervical vertebrae is often an anterior extension of the pre-epipophysis, which projects considerably anterior to the articular facet; anterodorsal corner of the lateral side of the posterior cervical vertebrae marked by a rugose tuberosity; posterior margin of the prezygapophyseal articular facet of posterior cervical vertebrae bordered posteriorly by conspicuous transverse sulcus; posterior cervical neural spines parallel to converging. The inclusion of K. siberi and several newly described characters into a previously published phylogenetic analysis recovers the new taxon as basal diplodocine, which concurs well with the low stratigraphical position of the holotype specimen. Dinheirosaurus and Supersaurus now represent the sister clade to Apatosaurus and Diplodocinae and therefore the most basal diplodocid genera. The geographical location in the less known northern parts of the Morrison Fm., where K. siberi was found, corroborates previous hypotheses on faunal provinces within the formation. The probable subadult ontogenetic stage of the holotype specimen allows analysis of ontogenetic changes and their influence on diplodocid phylogeny.


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Article DOI: 10.1080/14772019.2012.746589

Project DOI: 10.7934/P977, http://dx.doi.org/10.7934/P977
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 1 Document
  • 14 Taxa
  • 1 Specimen
  • 234 Characters
Total size of project's media files: 2 MB

Download Project SDD File
Total scored cells: 1990
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 234
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 482
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:234/0
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MorphoBank Project 977


    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    MorphoBank Curator
    Project Administrator
    Last logged in 06/16/15
    1411234001990
    (1990, 0, 0)
    000
    Maureen Admin
    Full membership
    Last logged in 11/05/13
    0000000
    (0, 0, 0)
    000
    Emanuel Tschopp
    Full membership
    Last logged in 06/21/13
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M2165' (14 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
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    [1] † Omeisaurus
    Last Modified in 12/05/13
    4818618500003
    [2] † Camarasaurus
    Last Modified in 12/05/13
    323123100003
    [3] † Limaysaurus tessonei
    Last Modified in 12/05/13
    7016416400003
    [4] † Amphicoelias
    Last Modified in 12/05/13
    210242400003
    [5] † Dicraeosaurus hansemanni
    Last Modified in 12/05/13
    3519919700003
    [6] † Amargasaurus
    Last Modified in 12/05/13
    10313113100003
    [7] † Suuwassea emilieae
    Last Modified in 12/05/13
    11811611400003
    [8] † Apatosaurus
    Last Modified in 12/05/13
    622822800003
    [9] † Supersaurus vivianae
    Last Modified in 12/05/13
    155797900003
    [10] † Dinheirosaurus lourinhanensis
    Last Modified in 12/05/13
    186484800003
    [11] † Tornieria africana
    Last Modified in 12/05/13
    12211210700003
    [12] † Diplodocus
    Last Modified in 12/05/13
    223223200003
    [13] † Barosaurus lentus
    Last Modified in 12/05/13
    10612812700003
    [14] † Kaatedocus siberi
    Last Modified in 12/05/13
    12211211000003


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    Project overview3240
    Media views4286Media search (3730 views); M304211 (556 views);
    Matrix views2122Matrix landing page (1886 views); Tschopp and Mateus Matrix (236 views);
    Specimen list1910
    Taxon list6810
    Views for media list1104
    Documents list1580
    Bibliography751




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    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project184
    Media downloads4M304211 (4 downloads);
    Matrix downloads2Tschopp and Mateus Matrix (2 downloads);
    Project downloads178