Project 3930: E. Cadena, A. Vanegas, C. Jaramillo, J. M. Cottle, T. A. Johnson. 2019. A new Miocene turtle from Colombia sheds light on the evolutionary history of the extant genus Mesoclemmys Gray, 1873. Journal of Vertebrate Paleontology. 39 (5):e1716777.
Specimen: Acanthochelys macrocephala (unvouchered)
View: whole organism

Abstract

Mesoclemmys is the most diverse extant genus of South American pleurodires or side-necked turtles, with at least 10 species inhabiting fluvial to littoral environments. Despite this high extant diversity and extensive geographic distribution, the evolutionary history and fossil record of this genus are completely unknown. Here, we describe the first fossil record of this genus, which supports a previous molecular-based hypothesis that indicates a minimum split time of 13.5 Ma between this and other genera of South American chelids. Mesoclemmys vanegasorum, sp. nov., is represented by a nearly complete shell (carapace and plastron) and some postcranial bones found in the middle Miocene (13.6 ± 0.2 Ma), La Victoria Formation, Tatacoa Desert, Colombia, increasing the turtle paleodiversity of La Venta Fauna. It differs from all extant species of Mesoclemmys by vertebral scute 1 reaching the sutural boundary between peripherals 1 and 2; shorter cervical and marginal scutes 1 to 3; pleurals 1 very advanced over the peripherals; pygal bone with a posteromedial shallow notch; vertebral 5 covering half of the pygal bone; small extragulars reaching only half of the epiplastra length; and a fine microvermiculation of the shell. Our phylogenetic results show a close relationship between M. vanegasorum, sp. nov., and the extant M. hogei. The overall morphology and size of Mesoclemmys genus have remained relatively constant for at least the last 13.6 million years. However, its geographic distribution has decreased drastically in northwestern South America, being restricted today to the lower region of the Magdalena River Basin.


Read the article »

Article DOI: 10.1080/02724634.2019.1716777

Project DOI: 10.7934/P3930, http://dx.doi.org/10.7934/P3930
This project containsMatrices
  • 2 Media
  • 1 Matrix
  • 32 Taxa
  • 2 Specimens
  • 84 Characters
Total size of project's media files: 7.74M

Download Project SDD File
Total scored cells: 2368
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 84
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 216
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:66/18
Currently Viewing:
MorphoBank Project 3930

    Authors' Institutions

    • Universite de Montpellier

    • University of California Santa Barbara

    • Smithsonian Tropical Research Institute

    • Universidad del Rosario

    • Fundacion Vigias Del Patrimonio Paleontologico La Tatacoa



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    MorphoBank Curator
    Project Administrator
    322284002368
    (2207, 0, 161)
    000
    Edwin-Alberto Cadena
    Full membership
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M27234' (32 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] Chelydra serpentina
    Last Modified in 02/17/21
    07474010002
    [2] † Notoemys laticentralis
    Last Modified in 02/17/21
    27535304002
    [3] † Platychelys obendorferi
    Last Modified in 02/17/21
    37444403002
    [4] † Araripemys barretoi
    Last Modified in 02/17/21
    3757506002
    [5] Podocnemis sextuberculata
    Last Modified in 02/17/21
    0787806002
    [6] Podocnemis expansa
    Last Modified in 02/17/21
    0787806002
    [7] Elseya dentata
    Last Modified in 02/17/21
    0787707002
    [8] Emydura macquarii
    Last Modified in 02/17/21
    0797905002
    [9] Rheodytes leukops
    Last Modified in 02/17/21
    0787806002
    [10] Myuchelys latisternum
    Last Modified in 02/17/21
    0767608002
    [11] Pseudemydura umbrina
    Last Modified in 02/17/21
    0807905002
    [12] Chelodina colliei
    Last Modified in 02/17/21
    0777707002
    [13] Chelodina expansa
    Last Modified in 02/17/21
    0777707002
    [14] Platemys platycephala
    Last Modified in 02/17/21
    0787806002
    [15] Acanthochelys macrocephala
    Last Modified in 02/17/21
    0787806002
    [16] Acanthochelys radiolata
    Last Modified in 02/17/21
    0787806002
    [17] Mesoclemmys nasuta
    Last Modified in 02/17/21
    0797905002
    [18] Mesoclemmys gibba
    Last Modified in 02/17/21
    0808004002
    [19] Phrynops hilari
    Last Modified in 02/17/21
    0808004002
    [20] Phrynops geoffroanus
    Last Modified in 02/17/21
    0808004002
    [21] Chelus fimbriatus
    Last Modified in 02/17/21
    0807905002
    [22] Hydromedusa maximiliani
    Last Modified in 02/17/21
    0808004002
    [23] Hydromedusa tectifera
    Last Modified in 02/17/21
    0797905002
    [24] † Hydromedusa casamayorensis
    Last Modified in 02/17/21
    34464604002
    [25] † Yaminuechelys gasparinii
    Last Modified in 02/17/21
    19656401002
    [26] † Yaminuechelys maior
    Last Modified in 02/17/21
    18656402002
    [27] † Yaminuechelys sulcipeculiaris
    Last Modified in 02/17/21
    64181802002
    [28] Mesoclemmys dahli
    Last Modified in 02/17/21
    0797905002
    [29] Mesoclemmys raniceps
    Last Modified in 02/17/21
    0797905002
    [30] Mesoclemmys vanderhaegei
    Last Modified in 02/17/21
    45353504002
    [31] † Mesoclemmys vanegasorum
    Last Modified in 02/17/21
    38414105002
    [32] Mesoclemmys hogei
    Last Modified in 02/17/21
    40404004002


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views2179
    Project overview214
    Matrix views158Data matrix (26 views); Matrix landing page (132 views);
    Media views521Media search (388 views); M739115 (68 views); M739116 (65 views);
    Specimen list339
    Taxon list711
    Views for media list140
    Bibliography96




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project54
    Project downloads51
    Matrix downloads3Data matrix (3 downloads);