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Seymouria from the Lower Permian of Southeastern Utah, and Possible Sexual Dimorphism in That Genus

Vaughn, Peter Paul

Journal of paleontology, 1966-05, Vol.40 (3), p.603-612 [Periódico revisado por pares]

Society of Economic Paleontologists and Mineralogists and the Paleontological Society

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  • Título:
    Seymouria from the Lower Permian of Southeastern Utah, and Possible Sexual Dimorphism in That Genus
  • Autor: Vaughn, Peter Paul
  • Assuntos: Bones ; Girdles ; Maxilla ; Rocks ; Sexual dimorphism ; Shales ; Skeleton ; Skull ; Spine ; Vertebrae
  • É parte de: Journal of paleontology, 1966-05, Vol.40 (3), p.603-612
  • Descrição: A new species of Seymouria, S. sanjuanensis, is described on the basis of specimens from the Lower Permian Organ Rock Shale, Cutler Group, San Juan County, Utah. Comparison of specimens of the different species of Seymouria corroborates earlier evidence presented by T. E. White for osteological sexual dimorphism in Seymouria. In addition to the distinction drawn by White wherein the haemal arches begin farther back in the caudal column in the males, possible other differences are that in the males the interorbital breadth is less, the maxillary bone is deeper, and the dentition in general and "canine" teeth in particular are more prominent. This analysis of dimorphism is supported by the studies of Z. V. Spinar on the discosauriscid seymouriamorphs. In the greater development of the dorsal surfaces of the postparietal and tabular bones, S. sanjuanensis is more primitive than S. baylorensis from the Clear Fork Group of Texas. A specimen of Seymouria sp. from the Wichita Group of Texas indicates that two lines of Seymouria, one in the Four Corners area and one in the Midcontinent, may have evolved independently of one another after separation by a barrier to faunal exchange.
  • Editor: Society of Economic Paleontologists and Mineralogists and the Paleontological Society
  • Idioma: Inglês
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