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Survival brachiopod faunas of the end-Permian mass extinction from the southern Alps (Italy) and South China

Published online by Cambridge University Press:  18 April 2006

ZHONG-QIANG CHEN
Affiliation:
School of Earth and Geographical Sciences, University of Western Australia, 35 Stirling Highway, Crawley 6009, WA, Australia
KUNIO KAIHO
Affiliation:
Institute of Geology and Paleontology, Tohoku University, Sendai 980-8578, Japan
ANNETTE D. GEORGE
Affiliation:
School of Earth and Geographical Sciences, University of Western Australia, 35 Stirling Highway, Crawley 6009, WA, Australia
JINNAN TONG
Affiliation:
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Abstract

Eight brachiopod species in seven genera are described from the Permian–Triassic boundary beds of South China and northern Italy. The brachiopods from northern Italy are described for the first time and include two new species: Orbicoelia dolomitensis Chen and Spirigerella? teseroi Chen. The Permian affinity of these brachiopods and their stratigraphical position above the extinction horizon demonstrate that they are survivors from the end-Permian mass extinction. The surviving brachiopods from South China, which was located at the eastern margin of the Palaeo-Tethys Ocean, are considerably abundant and diverse and are dominated by geographically widespread generalist elements adapted to a wide variety of environments. They were mostly limited to the Upper Permian to lowest Griesbachian. In contrast, the survivors in northern Italy, which was situated at the western margin of the Palaeo-Tethys, comprise elements ranging from the Carboniferous to Permian or widespread Tethyan genera. These survivors did not occur in the pre-extinction western Tethyan oceans but migrated into this region after the end-Permian extinction event. Disaster taxon Lingula proliferated slightly earlier in western Tethyan oceans than in eastern Tethyan regions following the event. Survival brachiopods from both regions appear to have a generic affinity, although they do not share any species. Both South Chinese and Italian survival faunas support the view that the survival interval is the duration when survivors are dominated by geographically widespread generalist organisms adapted to a wide variety of ecological conditions.

Type
Original Article
Copyright
© 2006 Cambridge University Press

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