DUYUNASPIS ZHANG AND QIANIN ZHOU ET AL.,1977(TRILOBITA)FROM THE “TSINGHSUTUNG FORMATION”(SERIES 2,STAGE 4)OF EASTERN GUIZHOU,SOUTH CHINA
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Abstract:
A new oryctocephalid species Duyunaspis jianheensis sp. nov. is described from the Cambrian "Tsinghsutung Formation"(Series 2,Stage 4)at Songshan,Jianhe,eastern Guizhou,South China,revealing that the genus Duyunaspis ranges up from the slightly older Balang Formation(Cambrian Stage 4).The Balang Formation is widely exposed in the border area between eastern Guizhou and western Hunan and is dominated by oryctocephalids including Duyunaspis. Duyunaspis jianheensis sp.nov.is characterized by having aglabella that is more or less expanded at its mid-lengtha,aproparian suture,and a thorax with 10 segments in holaspids. Detailed exploration of ontogeny of D.jianheensis sp.nov.shows that the new species seems to be a descendent of Duyunaspis duyunensis of the Balang Formation.
