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Paläontologische Zeitschrift

, Volume 80, Issue 1, pp 52–59 | Cite as

Two new species ofPseudopetigurus (Trilobita) from the Arenig — Llanvirn of South China

  • Samuel T. Turvey
  • Z. Y. Zhou
  • W. W. Yuan
Article
  • 48 Downloads

Abstract

Two new species ofPseudopetigurus are described from northern Hunan Province, China.P. deprati n. sp. is abundant in the upper Zitai Formation (upper Arenig) of Shuanghong, Baiyun, Shimen County, andP. expansus n. sp. occurs throughout the Jiuxi Formation (Arenig — lower Llanvirn) of Panjiazui, Taoyuan County. These formations represent outer shelf facies from the Jiangnan Transitional Belt of the South China Plate, close to the southeast margin of the Yangtze Platform. BothP. deprati andP. expansus show similarities to Upper Ordovician species ofPseudopetigurus recorded from South China. Other species ofPseudopetigurus are known almost entirely from cranidia, but pygidia and librigenae are also described for both new species, and the first known hypostome assigned to the genus is described forP. expansus. These two species are ecologically important members of offshore trilobite faunas during the Arenig — Llanvirn and define the outer shelfPseudopetigurus Association of South China. Despite being a deep-water genus,Pseudopetigurus is biogeographically restricted to the western margin of the Gondwanan craton and neighbouring regions of Baltica.

Keywords

Trilobita Ordovician Hunan Jiangnan Transitional Belt Jiuxi Formation Zitai Formation peri-Gondwana 

Kurzfassung

Zwei neue Arten vonPseudopetigurus werden aus dem Norden der Provinz Hunan, China, beschrieben.P. deprati n. sp. ist in der oberen Zitai-Formation (höheres Arenigium) von Shuanghong, Baiyun, Bezirk Shimen, weit verbreitet, undP. expansus n. sp. kommt in der gesamten Jiuxi-Formation (Arenigium bis tieferes Llanvirnium) von Panjiazui, Bezirk Taoyuan, vor. Diese Formationen repräsentieren die äußere Schelf-Fazies des Jiangnan Transitional Belt der Südchinesischen Platte, nahe dem südöstlichen Rand der Yangtze-Plattform. Beide neuenPseudopetigurus-Arten zeigen Ähnlichkeiten zu oberordovizischen Arten dieser Gattung aus Süd-China. Die meistenPseudopetigurus-Arten sind fast ausschließlich nur als Cranidien bekannt, aber von den beiden neuen Arten liegen auch Pygidien und Freiwangen vor; außerdem wird das erste zu dieser Gattung gestellte HypostomP. expansus zugeordnet. Beide neuen Arten sind ökologisch wichtige Vertreter der küstenfernen Trilobiten-Faunen vom Arenigium bis Llanvirnium und kennzeichnen diePseudopetigurus-Gemeinschaft des äußeren Schelf-Bereiches von Süd-China. ObwohlPseudopetigurus als Gattung der tieferen Wasserbereiche gilt, ist sie biogeographisch auf Paläo-Platten und Terranen, die entlang des westlichen Randes des Gondwana Kratons liegen, beschränkt.

Schlüsselwörter

Trilobita Ordovizium Hunan Jiangnan Transitional Belt Jiuxi Formation Zitai Formation Peri-Gondwana 

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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 2003

Authors and Affiliations

  • Samuel T. Turvey
    • 1
  • Z. Y. Zhou
    • 2
  • W. W. Yuan
    • 2
  1. 1.Department of Earth SciencesUniversity of OxfordUK
  2. 2.Nanjing Institute of Geology and PalaeontologyAcademia SinicaNanjingPeople’s Republic of China

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