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: 15 MB

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


    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
    Last logged in 07/08/15
    0271000000
    (0, 0, 0)
    00000
    Kenzley Alphonse
    Full membership
    Last logged in Never
    0000000000
    (0, 0, 0)
    00000
    MorphoBank Curator
    Full membership
    Last logged in 07/14/15
    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
    0595601003
    [2] Peltocephalus dumerilianus
    Last Modified in 06/23/15
    2545401003
    [3] Erymnochelys madagascariensis
    Last Modified in 06/23/15
    1555501003
    [4] Mogharemys blackenhorni
    Last Modified in 06/23/15
    30262601003
    [5] Brontochelys gaffneyi
    Last Modified in 06/23/15
    34232300003
    [6] Lemurchelys diasphax
    Last Modified in 06/23/15
    23343400003
    [7] Shweboemys pilgrimi
    Last Modified in 06/23/15
    31262600003
    [8] Stereogenys cromeri
    Last Modified in 06/23/15
    16414100003
    [9] Cordichelys antiqua
    Last Modified in 06/23/15
    11464600003
    [10] Latentemys plowdeni
    Last Modified in 06/23/15
    24333300003
    [11] IVIC-P-2908
    Last Modified in 06/23/15
    22353500003
    [12] "Bairdemys" healeyorum
    Last Modified in 06/23/15
    41161600003
    [13] Bairdemys venezuelensis
    Last Modified in 06/23/15
    2535302003
    [14] Bairdemys hartsteini
    Last Modified in 06/23/15
    21363600003
    [15] Bairdemys sanchezi
    Last Modified in 06/23/15
    14434200003
    [16] Bairdemys winklerae
    Last Modified in 06/23/15
    24333200003


    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
    01100003
    [2] Peltocephalus dumerilianus
    Last Modified in 06/23/15
    01100003
    [3] Erymnochelys madagascariensis
    Last Modified in 06/23/15
    01100003
    [4] Mogharemys blackenhorni
    Last Modified in 06/23/15
    01100003
    [5] Brontochelys gaffneyi
    Last Modified in 06/23/15
    10000003
    [6] Lemurchelys diasphax
    Last Modified in 06/23/15
    01100003
    [7] Shweboemys pilgrimi
    Last Modified in 06/23/15
    01100003
    [8] Stereogenys cromeri
    Last Modified in 06/23/15
    01100003
    [9] Cordichelys antiqua
    Last Modified in 06/23/15
    01100003
    [10] Latentemys plowdeni
    Last Modified in 06/23/15
    01100003
    [11] IVIC-P-2908
    Last Modified in 06/23/15
    01100003
    [12] "Bairdemys" healeyorum
    Last Modified in 06/23/15
    02100003
    [13] Bairdemys venezuelensis
    Last Modified in 06/23/15
    01100003
    [14] Bairdemys hartsteini
    Last Modified in 06/23/15
    02100003
    [15] Bairdemys sanchezi
    Last Modified in 06/23/15
    01100003
    [16] Bairdemys winklerae
    Last Modified in 06/23/15
    01100003


    Project views

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    Total project views19152
    Project overview2996
    Media views5864Media search (3108 views); M379902 (366 views); M379897 (358 views); M379900 (345 views); M379899 (509 views); M379901 (384 views); M379898 (376 views); M379313 (418 views);
    Documents list1413
    Bibliography632
    Specimen list1657
    Matrix views1474Matrix landing page (1392 views); Character Matrix (43 views); Inferred Habitat (39 views);
    Taxon list5116




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project141
    Document downloads3Phylogenetic data matrix (3 downloads);
    Project downloads128
    Matrix downloads10Character Matrix (7 downloads); Inferred Habitat (3 downloads);