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.


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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: 5 MB

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
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MorphoBank Project 574


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    MorphoBank Curator
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    Last logged in 02/20/12
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    Maureen Admin
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    Last logged in 10/10/11
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    Takuya Konishi
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    Last logged in 10/28/11
    197797001361
    (1358, 0, 3)
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    Taxonomic Overview for Matrix 'M1295' (19 Taxa)

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    [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


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    Bibliography2808
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    Matrix views1637Matrix landing page (1428 views); Phylogeny of Plioplatecarpinae (209 views);
    Specimen list4147
    Taxon list6681




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