中国科学院南京地质古生物研究所机构知识库

Well-preserved ostracods are documented for the first time from the upper Shihtzupu Formation (late Darriwilian to early Sandbian) of northern Guizhou Province, SW China. A total of 10 species are identified, including Pilla reedi (Wolfart, 2001a), Laccochilina (Prochilina) yanpingensis sp. nov., Ulrichia chekiangensis? Hou, 1956, Euprimitia compta Sun, 1987, Aechmina sp., Quadritia sp., Longiscula? sp. 1, Longiscula? sp. 2, Longiscula? sp. 3 and Silenis? sp., with the first two most common. Such an ostracod assemblage shows some similarities to ostracods documented from the Miaopo Formation of the same age in the Yichang area, Hubei Province, southern China, as well as to contemporaneous faunas found in Baltica, Australia, India, Sibumasu and the Argentine Precordillera. A global review of the temporal and spatial distribution of the biogeographically significant genus Pilla suggests that it might have originated in low-latitude areas and then migrated to other peri-Gondwana terranes like South China during the Ordovician.