Project 1213: M. L. Turner, L. A. Tsuji, O. Ide, C. A. Sidor. 2015. The vertebrate fauna of the Upper Permian of Niger—IX. The appendicular skeleton of Bunostegos akokanensis (Parareptilia: Pareiasauria). Journal of Vertebrate Paleontology. 35 (6).
Specimen: † Bunostegos akokanensis (unvouchered)

Abstract

ABSTRACT—Pareiasaurs were a group of herbivorous reptiles that lived during the middle to late Permian (~265–252 Ma) in what is modern-day Europe, Asia, South America, and Africa. Field work in the Moradi Formation of northern Niger has produced multiple elements of the appendicular skeleton of the pareiasaur Bunostegos akokanensis. The considerable size disparity and morphological variation among the elements suggest that they represent ontogenetic stages ranging from relatively juvenile to adult. Here we present the first description of the scapulocoracoid, humerus, radius, ulna, pelvis, and femur of Bunostegos as well as some of the first ontogenetic data for postcranial osteology in pareiasaurs. As with the skull, numerous postcranial autapomorphies characterize Bunostegos, including laterally originating acromion process of the scapula; radius and ulna with continuous articular surface on humerus; paired crests on the olecranon process; ulna longer than humerus; pinched posterior margin of the acetabular rim; robust pelvic symphysis extending the length of the puboischiatic plate; lack of a distinct postaxial flange of the femur; and an elaborated femoral lateral condyle wrapping over the medial condyle. We incorporated data from the appendicular skeleton of Bunostegos into a revised phylogenetic analysis of pareiasaur relationships. The results of this analysis corroborate previous cranial analyses that place Bunostegos between Guadalupian taxa and the Lopingian velosaur subclade. Interestingly, several aspects of its postcranial anatomy suggest that Bunostegos possessed relatively upright forelimb posture, which would be unique among pareiasaurs and possibly Permian amniotes as a whole.


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Article DOI: 10.1080/02724634.2014.994746

Project DOI: 10.7934/P1213, http://dx.doi.org/10.7934/P1213
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 1 Document
  • 29 Taxa
  • 1 Specimen
  • 139 Characters
Total size of project's media files: 7 MB

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Total scored cells: 2387
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 139
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 301
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:139/0
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MorphoBank Project 1213

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    member name taxa specimens media chars character
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    Morgan Turner
    Project Administrator
    Last logged in 01/22/16
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    Taxonomic Overview for Matrix 'M23670' (29 Taxa)

    taxon unscored
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    [1] † Millerettidae
    Last Modified in 12/01/15
    2511611400001
    [2] † Owenetta
    Last Modified in 12/01/15
    3610310300001
    [3] † Bashkyroleter bashkyricus
    Last Modified in 12/01/15
    90494900001
    [4] † Bashkyroleter mesensis
    Last Modified in 12/01/15
    86545300001
    [5] † Rhipaeosaurus
    Last Modified in 12/01/15
    96434300001
    [6] † Nycteroleter
    Last Modified in 12/01/15
    80595900001
    [7] † Emeroleter
    Last Modified in 12/01/15
    56838300001
    [8] † Macroleter
    Last Modified in 12/01/15
    3810110100001
    [9] † Bradysaurus baini
    Last Modified in 12/01/15
    1112812800001
    [10] † Bradysaurus seeleyi
    Last Modified in 12/01/15
    513413400001
    [11] † Nochelesaurus
    Last Modified in 12/01/15
    43969600001
    [12] † Embrithosaurus
    Last Modified in 12/01/15
    813113100001
    [13] † Deltavjatia
    Last Modified in 12/01/15
    1212712700001
    [14] † Shansisaurus
    Last Modified in 12/01/15
    109313000001
    [15] † Shihtienfenia
    Last Modified in 12/01/15
    117222200001
    [16] † Honania
    Last Modified in 12/01/15
    99424000001
    [17] † Pareiasuchus peringueyi
    Last Modified in 12/01/15
    1212712700001
    [18] † Pareiasuchus nasicornis
    Last Modified in 12/01/15
    2611311300001
    [19] † Pareiasaurus
    Last Modified in 12/01/15
    2211711700001
    [20] † Scutosaurus
    Last Modified in 12/01/15
    713213200001
    [21] † Parasaurus
    Last Modified in 12/01/15
    101383800001
    [22] † Elginia
    Last Modified in 12/01/15
    58818100001
    [23] † Provelosaurus
    Last Modified in 12/01/15
    70696900001
    [24] † Anthodon
    Last Modified in 12/01/15
    2711211200001
    [25] † Pumiliopareia
    Last Modified in 12/01/15
    74656500001
    [26] † Nanoparia
    Last Modified in 12/01/15
    84555500001
    [27] † Arganaceras
    Last Modified in 12/01/15
    82575700001
    [28] † Obirkovia
    Last Modified in 12/01/15
    1354400001
    [29] † Bunostegos akokanensis
    Last Modified in 12/01/15
    41989800001


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    Taxon list4020
    Bibliography628
    Documents list960




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