658


Journal of Paleontology 92(4):648–660


paleoenvironment where depauperated darwinulocopine faunas survived by deploying parthenogenesis as a strategy to recolo- nize stressed environments soon after their recovery from the establishment of CAMP and subsequent ETE. The darwinulocopine ostracodes had their origin in the late


Beerling, D.J., and Berner, R.A., 2002, Biogeochemical constraints on the Triassic-Jurassic boundary carbon cycle event: Global Biogeochemical Cycles, v. 16, p. 10–1–10-13. doi: 10.1029/2001GB001637.


Belousova, Z.D., 1961, [The ostracods of the Lower Trias]: Byulleten Moskovskogo Obshchestva Ispytateley Prirody: Otdel Geologicheskiy, v. 36, p. 127–147.


Paleozoic, but were significantly decimated by the P-Tr extinc- tion event and the ETE, never having re-established similar diversities since these extinctions. Lake Dixie has one of the earliest records so far known of an exclusively darwinulocopine fauna, and could represent the last episode of darwinulocopine dominance in nonmarine environments before the Late Jur- assic −Early Cretaceous diversification of the modern cyprido- copine/cytherocopine ostracodefaunas. It is possible that the geographic isolation of Lake Dixie, and perhaps other nearby lakes, behind the Wingate Erg desert and the early stages of the Nevadan orogeny played a major role in isolating these envir- onments from the explosive radiation of the cypridocopines and cytherocopines that ended the ‘Last Hurrah of the Reigning Darwinulocopines.’


Acknowledgments


The authors wish to first acknowledge the late N.E. Tibert (1996–2015) for his efforts on the research of ostracode samples throughout the terrestrial Mesozoic sequences of Utah, which served as an important basis for the present work. We thank A. Smith (Department of Anthropology, UConn) for use of the SEM in taking the photographs for the present work. Also many thanks go to M. Suarez (Department of Geological Sciences, University of Texas at San Antonio) for support of field trips to Potter and Olsen canyons. LSA acknowledges J. Krishna for assistance with the cataloging of specimens deposited at NHMU. CAS wishes to thank G. McDonald and R. Hunt-Foster (Bureau of Land Management, Washington, D.C., USA) for support in obtaining field permit #UT16-017S, which allowed for collection of samples in the Olsen Canyon area.


Accessibility of supplemental data


Data available from the Dryad Digital Repository: https://doi. org/10.5061/dryad.sh45f.


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