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LEE Seung-Bae,LEE Dong-Chan,WOO Jusun,ZHANG Xingliang.2016.Systematic Revision of Trilobites from the Middle Ordovician (Darriwilian) Klimoli Formation of the Zhuozishan Area, Inner Mongolia, China[J].Acta Geologica Sinica(),90(6):1955-1975
Systematic Revision of Trilobites from the Middle Ordovician (Darriwilian) Klimoli Formation of the Zhuozishan Area, Inner Mongolia, China    Download PDF
LEE Seung-Bae  LEE Dong-Chan  WOO Jusun  ZHANG Xingliang
This work is financially supported by a grant from the Basic Research Project (GP2016-013) of KIGAM to S.-B. Lee and the Korea Research Foundation (Grant No. KRF-R1A4007-2010-0011026) to D.-C. Lee.
DOI:
Abstract:
      New morphologic information permits systematic revision of trilobites from the Middle Ordovician Klimoli Formation of the Zhuozishan area, Ordos Basin, Inner Mongolia. The new assemblage is composed of 10 species of the Raphiophoridae, Nileidae, Asaphidae, and Telephinidae.? An asaphid, aff. Mioptychopyge lashachungensis (previously Paraptychopyge lashachungensis) displays an intermediate morphology between the Chinese nobiliasaphine genera Mioptychopyge and Zhenganites. The pygidial doublure is regarded as the most significant character to differentiate Symphysurus klimoliensis (previously Nileus klimoliensis) of the Nileidae from such closely allied taxa as Poronileus. A nileid, cf. Peraspis kujandensis displays typical nileid morphology, unlike the type species, Peraspis lineolata, which might turn out to be an asaphid. Ampyx gongwusuensis sp. nov. of the Raphiophoridae is the first record of the genus in the Zhuozishan area and reveals morphologic details that might be employed to resolve Ampyx taxonomy in China. Morphologic differences between A. gongwusuensis and Abulbaspis ordosensis might represent a case of sexual dimorphism.
Key words:Invertebrate paleontology, Trilobita, systematics, Klimoli Formation, Darriwilian, Zhuozishan, Inner Mongolia
Systematic Revision of Trilobites from the Middle Ordovician (Darriwilian) Klimoli Formation of the Zhuozishan Area, Inner Mongolia, China    Download Fulltext
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