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New Lower Triassic ichthyopterygian assemblage from Fossil Hill, Nevada



Ben Creisler
bcreisler@gmail.com



A new online paper:



Neil P. Kelley, Ryosuke Motani, Patrick Embree & Michael J. Orchard (2015)
A new Lower Triassic ichthyopterygian assemblage from Fossil Hill, Nevada.
PeerJ PrePrints 3:e1803
doi:  https://dx.doi.org/10.7287/peerj.preprints.1447v1
https://peerj.com/preprints/1447/
https://peerj.com/preprints/1447.pdf

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
circum-oceanic dispersal events in Early Triassic ichthyopterygians.