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
  • 2 Matrices
  • 1 Document
  • 14 Taxa
  • 1 Specimen
  • 464 Characters
Total size of project's media files: 1.32M

Download Project SDD File
Total scored cells: 3980
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 468
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 1069
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:468/0
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MorphoBank Project 977

    Authors' Institutions

    • American Museum of Natural History

    • Universidade Nova de Lisboa



    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
    1411238001990
    (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
    cell images
    member
    access
    [1] † Omeisaurus
    Last Modified in 10/29/20
    4818618500003
    [2] † Camarasaurus
    Last Modified in 10/29/20
    323123100003
    [3] † Limaysaurus tessonei
    Last Modified in 10/29/20
    7016416400003
    [4] † Amphicoelias
    Last Modified in 10/29/20
    210242400003
    [5] † Dicraeosaurus hansemanni
    Last Modified in 10/29/20
    3519919700003
    [6] † Amargasaurus
    Last Modified in 10/29/20
    10313113100003
    [7] † Suuwassea emilieae
    Last Modified in 10/29/20
    11811611400003
    [8] † Apatosaurus
    Last Modified in 10/29/20
    622822800003
    [9] † Supersaurus vivianae
    Last Modified in 10/29/20
    155797900003
    [10] † Dinheirosaurus lourinhanensis
    Last Modified in 10/29/20
    186484800003
    [11] † Tornieria africana
    Last Modified in 10/29/20
    12211210700003
    [12] † Diplodocus
    Last Modified in 10/29/20
    223223200003
    [13] † Barosaurus lentus
    Last Modified in 10/29/20
    10612812700003
    [14] † Kaatedocus siberi
    Last Modified in 10/29/20
    12211211000003


    Taxonomic Overview for Matrix 'M27056' (14 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] † Omeisaurus
    Last Modified in 10/29/20
    4818618500003
    [2] † Camarasaurus
    Last Modified in 10/29/20
    323123100003
    [3] † Limaysaurus tessonei
    Last Modified in 10/29/20
    7016416400003
    [4] † Amphicoelias
    Last Modified in 10/29/20
    210242400003
    [5] † Dicraeosaurus hansemanni
    Last Modified in 10/29/20
    3519919700003
    [6] † Amargasaurus
    Last Modified in 10/29/20
    10313113100003
    [7] † Suuwassea emilieae
    Last Modified in 10/29/20
    11811611400003
    [8] † Apatosaurus
    Last Modified in 10/29/20
    622822800003
    [9] † Supersaurus vivianae
    Last Modified in 10/29/20
    155797900003
    [10] † Dinheirosaurus lourinhanensis
    Last Modified in 10/29/20
    186484800003
    [11] † Tornieria africana
    Last Modified in 10/29/20
    12211210700003
    [12] † Diplodocus
    Last Modified in 10/29/20
    223223200003
    [13] † Barosaurus lentus
    Last Modified in 10/29/20
    10612812700003
    [14] † Kaatedocus siberi
    Last Modified in 10/29/20
    12211211000003


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views25852
    Project overview3669
    Media views4913Media search (4255 views); M304211 (658 views);
    Matrix views2409Matrix landing page (2123 views); Tschopp and Mateus Matrix (277 views); Matrix from Tschopp & Mateus - 2012 - with character states embedded (obtained from the supplemental material of the original paper) (9 views);
    Specimen list2193
    Taxon list8761
    Views for media list1267
    Documents list1759
    Bibliography881




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project248
    Media downloads5M304211 (5 downloads);
    Matrix downloads9Tschopp and Mateus Matrix (9 downloads);
    Project downloads233
    Document downloads1Copyright Permission (1 download);