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Evolution, Biogeography, and Systematics of Puriana: Evolution and Speciation in Ostracoda, III

Published online by Cambridge University Press:  11 August 2017

Thomas M. Cronin
Thomas M. Cronin*
Affiliation:
U.S. Geological Survey, 970 National Center, Reston, Virginia 22092
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Abstract

Three types of geographic isolation—land barriers, deep water barriers, and climatic barriers—resulted in three distinct evolutionary responses in Neogene and Quaternary species of the epineritic ostracode genus Puriana. Through systematic, paleobiogeographic, and morphologic study of several hundred fossil and Recent populations from the eastern Pacific, western Atlantic, Gulf of Mexico, and the Caribbean, the phylogeny of the genus and the geography of speciation events were determined. Isolation of large populations by the Isthmus of Panama during the Pliocene did not lead to lineage splitting in species known to have existed before the Isthmus formed. Conversely, the establishment of small isolated populations on Caribbean islands by passive dispersal mechanisms frequently led to the evolution of new species or subspecies. Climatic changes along the southeastern United States during the Pliocene also catalyzed possible parapatric speciation as populations that immigrated to the northeastern periphery of the genus' range split to form new species. The results provide evidence that evolutionary models describing the influence of abiotic events on patterns of evolution and speciation can be tested using properly selected tectonic and climatic events and fossil groups amenable to species-level analysis. Two new species, P. bajaensis and P. paikensis, are described.

Type
Research Article
Information
Journal of Paleontology , Volume 61 , Issue S21: Paleontological Society Memoir 21. Evolution, Biogeography, and Systematics of Puriana: Evolution and Speciation in Ostracoda, III , May 1987 , pp. 1 - 71
Copyright
Copyright © 1987 by The Paleontological Society, Inc. 

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