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A new survivor species of Dicoelosia (Brachiopoda) from Rhuddanian (Silurian) shallower-water biofacies in South China

Published online by Cambridge University Press:  20 May 2016

Bing Huang ,
Jia-Yu Rong  and
David A. T. Harper
Bing Huang
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, P. R. China, , Department of Earth Sciences, Durham University, Durham DH1 3LE, UK,
Jia-Yu Rong
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, P. R. China, ,
David A. T. Harper
Affiliation:
Department of Earth Sciences, Durham University, Durham DH1 3LE, UK,
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Abstract

The brachiopod genus Dicoelosia is generally considered a typical deep-water taxon. New data suggest that some species of the genus may have invaded relatively shallow-water habitats during its geological history. However, there is scant evidence for its invasion of shallow-water environments after the terminal Ordovician mass extinction. Dicoelosia occurs in the shallower-water benthic shelly assemblages of the lower Niuchang Formation (upper Rhuddanian, Llandovery) of Meitan County, northern Guizhou Province, South China. Evidence of a move to shallow water includes its morphology and population structure, regional paleogeography, sedimentology, together with the abundance and diversity of its shallow-water associates. Following the biotic crisis, deep-water environments were barely habitable, and may have driven Dicoelosia into shallower-water niches. The taxon endured the less suitable shallow-water environments until the deep-water benthic zones ameliorated after the recovery, implying a shallow-water refugium existed after the biotic crisis. A new species Dicoelosia cathaysiensis is erected herein. There is only one record of this genus in South China and this unique occurrence may reflect the distinctive paleobiogeography and environments of this region.

Type
Research Article
Information
Journal of Paleontology , Volume 87 , Issue 2 , March 2013 , pp. 232 - 242
Copyright
Copyright © The Paleontological Society 

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