Conodontophorid biodiversification during the Ordovician in South China

  • Wu R
  • Stouge S
  • Wang Z
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Wu, R., Stouge, S. & Wang, Z. 2012: Conodontophorid biodiversification
during the Ordovician in South China. Lethaia, Vol. 45, pp. 432442.
Analysis of the Ordovician conodontophorid diversity pattern for South
China using normalized and total diversity measures reveals that
diversity peaks occurred in the mid-Tremadocian, mid-late Floian, early
Dapingian and mid-Darriwilian periods. The conodontophorids radiated
during the Floian, maintaining relatively high diversity into the early
part of the Middle Ordovician until a significant diversity decrease
occurred in the late Dapingian. A relatively low diversity level
prevailed in the Late Ordovician. Three diversification intervals based
on origination, extinction and turnover rates have been identified i.e.
(1) Tremadocian to mid-late Floian, (2) early Dapingian and (3) late
Dapingian to early Darriwilian. Diversity curves for conodontophorids,
brachiopods, graptolites, acritarchs and trilobites from South China are
comparable during the Early Ordovician, although differences are
apparent in the Middle and Late Ordovician. In South China,
conodontophorid diversity reacted primarily to sea-level changes during
the Early and Middle Ordovician, when the peak of this
biodiversification generally coincided with a transgression. Climate
changes especially the global cooling that occurred during the Late
Ordovician glaciation and sea-water chemistry were also important
controlling factors. ?Biodiversification, conodonts, Ordovician, South

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  • Rongchang Wu

  • Svend Stouge

  • Zhihao Wang

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