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Late Cambrian Radiolaria from Hunan, China

Published online by Cambridge University Press:  20 May 2016

Dong Xiping
Department of Geology, Peking University, Beijing, 100871, People's Republic of China
Andrew H. Knoll
Botanical Museum, Harvard University, Cambridge, Massachusetts 02138
Jere H. Lipps
Museum of Paleontology, University of California, Berkeley, California 94720 USA


Well-preserved polycystine radiolarians, representing a new species in the family Entactiniidae, were recovered from subtidal micrites and bioclastic micrites of the Upper Cambrian (Glyptagnostus reticulatus trilobite zone) Bitiao Formation, western Hunan, China. Confirming earlier, questionable reports of Cambrian Radiolaria, these fossils place the first appearance of the group somewhat before its Ordovician emergence as a principal constituent of the oceanic silica cycle, but long after the Proterozoic diversification of protists.

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