峡东地区庙坡组栉虫类、宝石虫类和斜视虫类三叶虫

RESTUDY ON THE TRILOBITES (ASAPHIDS,NILEIDS, AND ILLAENIDS) FROM THE MIAOPO FORMATION(UPPER ORDOVICIAN) IN EASTERN YANGTZE GORGE AREA,WESTERN HUBEI

系统描述湖北宜昌和秭归新滩晚奥陶世庙坡组三叶虫动物群中的 3科 6属 6种。根据化石保存状态 ,挤压变形以及个体发育特征 。

The trilobites described in this paper were collected from the Late Ordovician Miaopo Formation at Huanghuachang,Fenxiang,Yichang and Xiatantuo,Xintan,Zigui in western Hubei.They contain 6 species in 6 genera,namly, Birmanites hupeiensis Yi 1957, Platyptychopyge quadrata Xia 1978, Ogmasaphus fenhsiangensis (Yi,1957), Lisogorites scuteloides (Lu,1975), Nileus convergens Lu 1957,and Stenopareia miaopoensis Lu 1975. Birmanites yangtzeensis Lu 1975, B.politus Lu 1975 and B.elongatus Xiang et Zhou 1987 are considered to be junior synonyms of Birmanites hupeiensis Yi 1957. Platyptychopyge semicirculata Xiang et Zhou 1987 and P.jielingensis Xiang et Zhou 1987 are suppressed by Platyptychopyge quadrata Xia 1978.A pygidium assigned Birmanites hupeiensis Yi by Yi (1957,pl.3,fig.1g) and Opsimasaphus xilingxiaensis Xia sensu Sun Zhen hua 1984 should be synonymous with Platyptychopyge quadrata Xia. Opsimasaphus fusiformis Xia 1978, O.xilingxiaensis Xia 1978, Pseudasaphus limatus Xia 1978 and Ogmasaphus triangularis Xiang et Zhou 1987,are all placed in synonymys of Ogmasaphus fenhsiangensis (Yi,1957). Tangyaia expansa Lu 1975 and Tangyaia elongata Xiang et Zhou 1987 are junior synonyms of Liaogorites scutelloides (Lu,1975). Nileus petilus Xia 1978 is synonymous with Nileus convergens Lu 1975,while Illaenus leuros Xia 1978, I.apricus Xia 1978, I.spinosus Xiang et Zhou 1987, I. cf. punctulosus Salter sensu Yi Yuan en 1957, I.? sp.and ?I. sp.1 sensu Lu Yan hou 1975,are all synonyms of Stenopareia miaopoensis Lu 1975.