Project 2194: G. S. Ferreira, A. D. Rincón, A. Solórzano, M. C. Langer. 2015. The last marine pelomedusoids (Testudines: Pleurodira): a new species of Bairdemys and the paleoecology of Stereogenyina. PeerJ. 3 (e1063):1-29.
Specimen: Bairdemys thalassica (IVIC-P-2908)

Abstract

The extinct Stereogenyina turtles form a relatively diverse Podocnemididae lineage, with twelve described and phylogenetically positioned species. They are characterized by a wide geographic and temporal range, from the Eocene of Africa to the Pleistocene of Southeast Asia, and a peculiar palate morphology, with a secondary palate that is unique among side-necked turtles. Here, we describe a new Stereogenyina species, based on an almost complete skull from the middle Miocene Capadare Formation, of Venezuela. A new phylogenetic analysis supports the assignment of the new species to the genus Bairdemys. Based on geometric morphometrics analyses, we related the development of the stereogenyin secondary palate with the acquisition of a durophagous diet. Based on a review of the sedimentary environments where their fossils are found, we also propose that stereogenyins were a marine radiation of podocnemidid turtles, as corroborated by previous studies of fossil eggs and limb morphology. These two inferences allowed us to hypothesize that stereogenyins occupied an ecological niche similar to that of the extant Carettini sea turtles, and that the rise of the latter group may be related to the Stereogenyina diversity fall in the end of the Miocene.


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Article DOI: 10.7717/peerj.1063

Project DOI: 10.7934/P2194, http://dx.doi.org/10.7934/P2194
This project containsMatrices
  • 7 Media
  • 2 Matrices
  • 1 Document
  • 17 Taxa
  • 2 Specimens
  • 58 Characters
Total size of project's media files: 12.23M

Download Project SDD File
Total scored cells: 636
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 58
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 120
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:54/4
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MorphoBank Project 2194

    Authors' Institutions

    • Universidade de Sao Paulo (USP, University of Sao Paulo)

    • Instituto Venezolano de Investigaciones Científicas (IVIC)



    Members

    member name taxa specimens media media
    notes
    chars character
    comms
       
    notes  media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    comms
        
    notes  medialabels
    rules
    Gabriel Ferreira
    Project Administrator
    0271000000
    (0, 0, 0)
    00000
    MorphoBank Curator
    Full membership
    17000580000636
    (630, 0, 6)
    02000


    Taxonomic Overview for Matrix 'M23395' (16 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] Podocnemis unifilis
    Last Modified in 06/23/15
    0595601002
    [2] Peltocephalus dumerilianus
    Last Modified in 06/23/15
    2545401002
    [3] Erymnochelys madagascariensis
    Last Modified in 06/23/15
    1555501002
    [4] Mogharemys blackenhorni
    Last Modified in 06/23/15
    30262601002
    [5] Brontochelys gaffneyi
    Last Modified in 06/23/15
    34232300002
    [6] Lemurchelys diasphax
    Last Modified in 06/23/15
    23343400002
    [7] Shweboemys pilgrimi
    Last Modified in 06/23/15
    31262600002
    [8] Stereogenys cromeri
    Last Modified in 06/23/15
    16414100002
    [9] Cordichelys antiqua
    Last Modified in 06/23/15
    11464600002
    [10] Latentemys plowdeni
    Last Modified in 06/23/15
    24333300002
    [11] IVIC-P-2908
    Last Modified in 06/23/15
    22353500002
    [12] "Bairdemys" healeyorum
    Last Modified in 06/23/15
    41161600002
    [13] Bairdemys venezuelensis
    Last Modified in 06/23/15
    2535302002
    [14] Bairdemys hartsteini
    Last Modified in 06/23/15
    21363600002
    [15] Bairdemys sanchezi
    Last Modified in 06/23/15
    14434200002
    [16] Bairdemys winklerae
    Last Modified in 06/23/15
    24333200002


    Taxonomic Overview for Matrix 'M23396' (16 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] Podocnemis unifilis
    Last Modified in 06/23/15
    01100002
    [2] Peltocephalus dumerilianus
    Last Modified in 06/23/15
    01100002
    [3] Erymnochelys madagascariensis
    Last Modified in 06/23/15
    01100002
    [4] Mogharemys blackenhorni
    Last Modified in 06/23/15
    01100002
    [5] Brontochelys gaffneyi
    Last Modified in 06/23/15
    10000002
    [6] Lemurchelys diasphax
    Last Modified in 06/23/15
    01100002
    [7] Shweboemys pilgrimi
    Last Modified in 06/23/15
    01100002
    [8] Stereogenys cromeri
    Last Modified in 06/23/15
    01100002
    [9] Cordichelys antiqua
    Last Modified in 06/23/15
    01100002
    [10] Latentemys plowdeni
    Last Modified in 06/23/15
    01100002
    [11] IVIC-P-2908
    Last Modified in 06/23/15
    01100002
    [12] "Bairdemys" healeyorum
    Last Modified in 06/23/15
    02100002
    [13] Bairdemys venezuelensis
    Last Modified in 06/23/15
    01100002
    [14] Bairdemys hartsteini
    Last Modified in 06/23/15
    02100002
    [15] Bairdemys sanchezi
    Last Modified in 06/23/15
    01100002
    [16] Bairdemys winklerae
    Last Modified in 06/23/15
    01100002


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views34422
    Project overview4576
    Media views10618Media search (5210 views); M379902 (740 views); M379897 (738 views); M379900 (719 views); M379899 (879 views); M379901 (769 views); M379898 (741 views); M379313 (822 views);
    Documents list1999
    Bibliography1167
    Specimen list3538
    Matrix views2324Matrix landing page (2013 views); Character Matrix (146 views); Inferred Habitat (165 views);
    Taxon list10200




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project293
    Document downloads3Phylogenetic data matrix (3 downloads);
    Project downloads277
    Matrix downloads13Character Matrix (8 downloads); Inferred Habitat (5 downloads);