Project 574: T. Konishi, M. W. Caldwell. 2011. Two New Plioplatecarpine (Squamata, Mosasauridae) Genera from the Upper Cretaceous of North America, and a Global Phylogenetic Analysis of Plioplatecarpines. Journal of Vertebrate Paleontology. 31 (4):754-783.
Specimen: Platecarpus planifrons (MSC:9515)

Abstract

A new plioplatecarpine taxon, Latoplatecarpus, gen. nov., is proposed here to incorporate two species, L. willistoni, sp. nov., and L. nichollsae (comb. nov.). The new genus is currently restricted in distribution to the lower middle Campanian of North America. Phylogenetic analysis incorporating 97 morphological characters and 17 ingroup taxa indicates that (1) Ectenosaurus clidastoides is the basal-most member within the Plioplatecarpinae; (2) Platecarpus planifrons is generically distinct from P. tympaniticus; (3) Latoplatecarpus willistoni, gen. et sp. nov., constitutes the basal-most member within the clade that is sister to Platecarpus tympaniticus; and (4) as many as 17 unequivocal character changes support the clade comprising the three post-middle Campanian Plioplatecarpus species. Plesioplatecarpus, gen. nov., is erected to establish Plesioplatecarpus planifrons (comb. nov.). Further, we propose that the North American specimens referred to Platecarpus somenensis pertain to Latoplatecarpus nichollsae, based on the available phylogenetic, ontogenetic, biostratigraphic, and paleobiogeographic data and interpretations. Consequently, the current study recognizes 11 species within seven genera to constitute the Plioplatecarpinae. Of anatomical note, we suggest that quadrates in most plioplatecarpine taxa including Latoplatecarpus were tilted anteriorly in life, as a result of the suspensorial articulation forming along the distomedial portion of the long suprastapedial process that typifies quadrates in plioplatecarpine mosasaurs.


Read the article »

Project DOI: 10.7934/P574, http://dx.doi.org/10.7934/P574
This project containsMatrices
  • 7 Media
  • 1 Matrix
  • 1 Document
  • 19 Taxa
  • 7 Specimens
  • 97 Characters
Total size of project's media files: 3.47M

Download Project SDD File
Total scored cells: 1361
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 97
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 280
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:97/0
Currently Viewing:
MorphoBank Project 574

    Authors' Institutions

    • Royal Tyrrell Museum of Palaeontology, Drumheller

    • University of Alberta



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    MorphoBank Curator
    Project Administrator
    0000000
    (0, 0, 0)
    000
    Maureen Admin
    Full membership
    0000000
    (0, 0, 0)
    000
    Takuya Konishi
    Full membership
    197797001361
    (1358, 0, 3)
    000


    Taxonomic Overview for Matrix 'M1295' (19 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] Clidastes propython
    Last Modified in 12/05/13
    27737000003
    [2] Kourisodon puntledgensis
    Last Modified in 12/05/13
    25707002003
    [3] Yaguarasaurus columbianus
    Last Modified in 12/05/13
    45525200003
    [4] Russellosaurus coheni
    Last Modified in 12/05/13
    28696900003
    [5] Tethysaurus nopcsai
    Last Modified in 12/05/13
    28706900003
    [6] Tylosaurus kansasensis
    Last Modified in 12/05/13
    33646400003
    [7] Tylosaurus proriger
    Last Modified in 12/05/13
    3949400003
    [8] Ectenosaurus clidastoides
    Last Modified in 12/05/13
    23747301003
    [9] Angolasaurus bocagei
    Last Modified in 12/05/13
    51464600003
    [10] Selmasaurus russelli
    Last Modified in 12/05/13
    57434000003
    [11] Selmasaurus johnsoni
    Last Modified in 12/05/13
    27707000003
    [12] Platecarpus planifrons
    Last Modified in 12/05/13
    17808000003
    [13] Platecarpus tympaniticus
    Last Modified in 12/05/13
    1999600003
    [14] Latoplatecarpus willistoni
    Last Modified in 12/05/13
    18817900003
    [15] Plioplatecarpus nichollsae
    Last Modified in 12/05/13
    21767600003
    [16] 'Platecarpus somenensis'
    Last Modified in 12/05/13
    20797700003
    [17] Plioplatecarpus primaevus
    Last Modified in 12/05/13
    10898700003
    [18] Plioplatecarpus houzeaui
    Last Modified in 12/05/13
    29706800003
    [19] Plioplatecarpus marshi
    Last Modified in 12/05/13
    39595800003


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views42009
    Media views11156Media search (4874 views); M93451 (850 views); M93453 (784 views); M93452 (832 views); M93455 (1111 views); M93456 (962 views); M93450 (821 views); M93454 (922 views);
    Bibliography4466
    Project overview3080
    Documents list1610
    Matrix views2373Matrix landing page (2100 views); Phylogeny of Plioplatecarpinae (273 views);
    Specimen list6496
    Taxon list12828




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project421
    Media downloads12M93450 (2 downloads); M93453 (2 downloads); M93455 (2 downloads); M93456 (2 downloads); M93451 (2 downloads); M93454 (1 download); M93452 (1 download);
    Project downloads383
    Matrix downloads22Phylogeny of Plioplatecarpinae (22 downloads);
    Document downloads4Copyright information for exemplar media (4 downloads);