title: A new Lower Triassic ichthyopterygian assemblage from Fossil Hill, Nevada.
abstract: 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.
authors: Department of Paleobiology, National Museum of Natural History, Smithsonian, Washington, District of Columbia, United States; Department of Earth and Planetary Sciences, University of California, Davis, Davis, California, United States.
authors: Neil P
authors: NP
authors: Kelley
authors: Department of Earth and Planetary Sciences, University of California, Davis , Davis, California , United States.
authors: Ryosuke
authors: R
authors: Motani
authors: Orangevale, California , United States.
authors: Patrick
authors: P
authors: Embree
authors: Natural Resources Canada-Geological Survey of Canada , Vancouver, British Columbia , Canada.
authors: Michael J
authors: MJ
authors: Orchard
keywords: Ichthyopterygia; Ichthyosaur; Marine reptile; Nevada; Triassic