The vertebrate fauna of the upper Permian of Niger—IX. The appendicular skeleton of Bunostegos akokanensis (Parareptilia: Pareiasauria).
In: Journal of Vertebrate Paleontology, Jg. 35 (2015-11-01), Heft 6, S. 0
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Zugriff:
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 pareiasaurBunostegos 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 ofBunostegosas well as some of the first ontogenetic data for postcranial osteology in pareiasaurs. As with the skull, numerous postcranial autapomorphies characterizeBunostegos, 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 ofBunostegosinto a revised phylogenetic analysis of pareiasaur relationships. The results of this analysis corroborate previous cranial analyses that placeBunostegosbetween Guadalupian taxa and the Lopingian velosaur subclade. Interestingly, several aspects of its postcranial anatomy suggest thatBunostegospossessed relatively upright forelimb posture, which would be unique among pareiasaurs and possibly Permian amniotes as a whole. SUPPLEMENTAL DATA—Supplemental materials are available for this article for free atwww.tandfonline.com/UJVP Citation for this article: Turner, M. L., L. A. Tsuji, O. Ide, and C. A. Sidor. 2015. The vertebrate fauna of the upper Permian of Niger—IX. The appendicular skeleton ofBunostegos akokanensis(Parareptilia: Pareiasauria). Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2014.994746. [ABSTRACT FROM AUTHOR]
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The vertebrate fauna of the upper Permian of Niger—IX. The appendicular skeleton of Bunostegos akokanensis (Parareptilia: Pareiasauria).
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Autor/in / Beteiligte Person: | Turner, Morgan L. ; Tsuji, Linda A. ; Ide, Oumarou ; Sidor, Christian A. |
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Zeitschrift: | Journal of Vertebrate Paleontology, Jg. 35 (2015-11-01), Heft 6, S. 0 |
Veröffentlichung: | 2015 |
Medientyp: | academicJournal |
ISSN: | 0272-4634 (print) |
DOI: | 10.1080/02724634.2014.994746 |
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