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  • 1
    Call number: SR 90.0088(62)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: IV, 20 S.
    Series Statement: Smithsonian contributions to paleobiology 62
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    ISSN: 1573-8604
    Keywords: primate evolution ; cranial morphology ; Adapidae ; Lemuriformes ; Anthropoidea ; Haplorhini
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This comparative study of the cranial and dental morphology ofMahgarita stevensi, which includes description of new fossil material, is designed to address hypotheses concerning the phylogenetic position ofMahgarita with respect to the Anthropoidea and tooth-combed prosimians (Lemuriformes, including Lorisoidea).Mahgarita shares with Oligocene anthropoids and primitive platyrrhines a complex assemblage of structural features that do not occur together in any tooth-combed prosimians; they include a large promontory canal and reduced or absent stapedial canal, a pneumatized petromastoid, a lateral transverse intrabullar septum and probable absence of a free annular ectotympanic, synostosed mandibular symphysis with a transverse torus, a short deep maxilla, maxillomaxillary contact on the inferior orbital margin, an upper canine with a mesial groove, a pronounced nasal spine of the palatine bone, and detailed similarities in occlusal features of the upper molars and other teeth.Mahgarita shares with tooth-combed prosimians several primitive euprimate characters, such as lack of postorbital closure and absence of intrabullar trabeculae. Previous conclusions thatMahgarita is related closely to living strepsirhines were based on a small number of primitive, gradistic features. Cranial characters that have been presented in favor of a tarsiiform-anthropoid clade are analyzed with respect toMahgarita and primitive anthropoids. The results suggest that, among known prosimians,Mahgarita is the one most closely related to the Anthropoidea.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2010-09-01
    Description: Despite increasingly intensive paleontological sampling, Cretaceous terrestrial vertebrates from continental Africa remain relatively poorly known, frustrating efforts to characterize paleoecosystems in the region, as well as the paleobiogeography of the southern continents during this interval. Here we describe the partial skeleton of a large-bodied theropod dinosaur from the Early Cretaceous (early Aptian, ~125-120 Ma) of Libya. The specimen consists of associated elements (two incomplete dorsal vertebrae, a proximal caudal centrum, a partial proximal caudal neural arch, the distal right femur, and the mostly complete right tibia) and is referable to the widespread ceratosaurian clade Abelisauroidea. The discovery adds to the growing record of abelisauroids from mainland Africa, and firmly establishes the presence of the clade on the continent prior to its final separation from South America. Indeed, the age of the Libyan theropod predates or is penecontemporaneous with the accepted timing of fragmentation of most major Gondwanan landmasses, supporting the hypothesis that abelisauroids could have dispersed throughout the southern continents before land connections between these areas were severed. Moreover, the considerable size of the Libyan form challenges assertions that abelisauroids were ecologically subordinate to basal tetanuran theropods in Early and middle Cretaceous paleoenvironments of Gondwana.
    Print ISSN: 0022-3360
    Electronic ISSN: 1937-2337
    Topics: Geosciences
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