A new Lower Triassic ichthyopterygian assemblage from Fossil Hill, Nevada

PeerJ

article

Neil P. Kelley¹  Ryosuke Motani²  Patrick Embree³  Michael J. Orchard⁴ 

[1] Department of Paleobiology, National Museum of Natural History;Department of Earth and Planetary Sciences, University of California;Orangevale;Natural Resources Canada–Geological Survey of Canada

关键词: Triassic;    Ichthyosaur;    Ichthyopterygia;    Marine reptile;    Nevada;   

DOI  :  10.7717/peerj.1626

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

We report a new ichthyopterygian assemblage from Lower Triassic horizons of the Prida Formation at Fossil Hill in central Nevada. Although fragmentary, the specimens collected so far document a diverse fauna. One partial jaw exhibits isodont dentition with blunt tipped, mesiodistally compressed crowns and striated enamel. These features are shared with the Early Triassic genus Utatsusaurus known from coeval deposits in Japan and British Columbia. An additional specimen exhibits a different dentition characterized by relatively small, rounded posterior teeth resembling other Early Triassic ichthyopterygians, particularly Grippia. This Nevada assemblage marks a southward latitudinal extension for Early Triassic ichthyopterygians along the eastern margin of Panthalassa and indicates repeated trans-hemispheric dispersal events in Early Triassic ichthyopterygians.

【 授权许可】

CC BY