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New ichthyopterygian assemblage from Lower Triassic Fossil Hill, Nevada (free pdf)



Ben Creisler
bcreisler@gmail.com

A new paper in open access PeerJ:



Neil P. Kelley, Ryosuke Motani, Patrick Embree & Michael J. Orchard  (2016)
A new Lower Triassic ichthyopterygian assemblage from Fossil Hill, Nevada.
PeerJ 4:e1626
doi: https://doi.org/10.7717/peerj.1626
https://peerj.com/articles/1626/



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.