Project 699: E. S. Gaffney, D. W. Krause. 2011. Sokatra, a new side-necked turtle (late Cretaceous, Madagascar) and the diversification of the main groups of Pelomedusoides. American Museum Novitates. 3728:1-28.
Specimen: Sokatra antitra (UA:9769)
View: holotype skull, dorsal

Abstract

Sokatra antitra, n. gen. et sp., is a new side-necked turtle from the Maastrichtian (Upper Cretaceous) Maevarano Formation, Mahajanga Basin, northwestern Madagascar. Sokatra antitra is based on a series of incomplete skulls: a partial skull that lacks the premaxillae and some of the basicranium, a partial skull that has a complete ear region and partial basicranium, and other isolated specimens, including dentaries. Although this species exhibits some features of the North African and Brazilian Euraxemydidae, it does not belong to this family, but instead it is the sister taxon of the magnafamily Podocnemidera of Gaffney et al. (2006, 2011). Characters of Sokatra uniting it with the magnafamily Podocnemidera are: quadratebasisphenoid contact, ventral covering of processus interfenestralis of opisthotic, and at least half of prootic covered ventrally. The laterally open foramen jugulare posterius and the distinct accessory ridge on the maxilla are characteristic, but not unique, features shared with members of the Euraxemydidae. The presence of a small wall posterior to the columellae auris and medial to the incisura columellae auris and the formation of the foramen posterius canalis carotici interni by both the prootic and quadrate are unique to Sokatra. In a PAUP analysis using the character matrix from Gaffney et al. (2006), Sokatra resolves as: (Pelomedusidae, Araripemys (Sokatra (Euraxemydidae (Bothremydidae, Podocnemididae)))). The deep phylogenetic roots of Sokatra indicates the presence of its lineage on Madagascar prior to the beginning of the late Cretaceous.


Read the article »

Project DOI: 10.7934/P699, http://dx.doi.org/10.7934/P699
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 1 Document
  • 48 Taxa
  • 1 Specimen
  • 175 Characters
Total size of project's media files: 1 MB

Download Project SDD File
Total scored cells: 5319
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 175
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 423
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:175/0
Currently Viewing:
MorphoBank Project 699

    This research
    supported by

    Authors' Institutions

    • American Museum of Natural History, New York City



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    MorphoBank Curator
    Project Administrator
    Last logged in 08/06/14
    4811175005319
    (5319, 0, 0)
    000
    Maureen Admin
    Full membership
    Last logged in 07/09/12
    0000000
    (0, 0, 0)
    000
    Eugene Gaffney
    Full membership
    Last logged in Never
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M1616' (47 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] Synapsida/Diapsida
    Last Modified in 12/05/13
    3814013700003
    [2] Proganochelys
    Last Modified in 12/05/13
    616916900003
    [3] Australochelys
    Last Modified in 12/05/13
    127484800003
    [4] Palaeochersis
    Last Modified in 12/05/13
    106696900003
    [5] Kayentachelys
    Last Modified in 12/05/13
    417117100003
    [6] Selmacryptodira
    Last Modified in 12/05/13
    121917400003
    [7] Chelidae
    Last Modified in 12/05/13
    120117400003
    [8] Pelomedusidae
    Last Modified in 12/05/13
    019017500003
    [9] Sokatra
    Last Modified in 12/05/13
    87888800003
    [10] Araripemys
    Last Modified in 12/05/13
    717016800003
    [11] Euraxemys
    Last Modified in 12/05/13
    716816800003
    [12] Dirqadim
    Last Modified in 12/05/13
    7010510500003
    [13] Podocnemididae
    Last Modified in 12/05/13
    019717500003
    [14] Hamadachelys
    Last Modified in 12/05/13
    5911611600003
    [15] Brasilemys
    Last Modified in 12/05/13
    6610910900003
    [16] Cearachelys
    Last Modified in 12/05/13
    1216816300003
    [17] Galianemys emringeri
    Last Modified in 12/05/13
    6710910800003
    [18] Galianemys whitei
    Last Modified in 12/05/13
    6610910900003
    [19] Kurmademys
    Last Modified in 12/05/13
    2115415400003
    [20] Kinkonychelys
    Last Modified in 12/05/13
    90858100003
    [21] Sankuchemys
    Last Modified in 12/05/13
    110656500003
    [22] Foxemys
    Last Modified in 12/05/13
    1116616300003
    [23] Polysternon
    Last Modified in 12/05/13
    4812812700003
    [24] Araiochelys
    Last Modified in 12/05/13
    4113413400003
    [25] Zolhafah
    Last Modified in 12/05/13
    92838300003
    [26] Rosasia
    Last Modified in 12/05/13
    5512012000003
    [27] Bothremys cooki
    Last Modified in 12/05/13
    114616100003
    [28] Bothremys maghrebiana
    Last Modified in 12/05/13
    5312812200003
    [29] Bothremys kellyi
    Last Modified in 12/05/13
    85909000003
    [30] Bothremys arabicus
    Last Modified in 12/05/13
    112636300003
    [31] Chedighaii hutchisoni
    Last Modified in 12/05/13
    7210310300003
    [32] Chedighaii barberi
    Last Modified in 12/05/13
    4413113100003
    [33] Taphrosphys sulcatus
    Last Modified in 12/05/13
    5112512400003
    [34] Taphrosphys congolensis
    Last Modified in 12/05/13
    6111411400003
    [35] Taphrosphys ippolitoi
    Last Modified in 12/05/13
    80959400003
    [36] Azabbaremys
    Last Modified in 12/05/13
    6810710600003
    [37] Acleistochelys
    Last Modified in 12/05/13
    76999900003
    [38] Labrostochelys
    Last Modified in 12/05/13
    7410210100003
    [39] Phosphatochelys
    Last Modified in 12/05/13
    7110510400003
    [40] Ummulisani
    Last Modified in 12/05/13
    6411411100003
    [41] Rhothonemys
    Last Modified in 12/05/13
    111646400003
    [42] Nigeremys
    Last Modified in 12/05/13
    99767600003
    [43] Arenila
    Last Modified in 12/05/13
    103727200003
    [44] Proterochersis
    Last Modified in 12/05/13
    141343400003
    [45] Platychelys
    Last Modified in 12/05/13
    124535000003
    [46] Notoemys
    Last Modified in 12/05/13
    120555400003
    [47] Dortoka
    Last Modified in 12/05/13
    131474400003


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views26635
    Project overview2949
    Matrix views1805Matrix landing page (1575 views); Sokatra matrix (230 views);
    Specimen list2030
    Media views4193Media search (3481 views); M106696 (712 views);
    Taxon list12562
    Documents list1375
    Bibliography695
    Views for media list1026




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project269
    Project downloads255
    Matrix downloads14Sokatra matrix (14 downloads);