贵州剑河八郎“清虚洞组”Olenoides Meek，1877的研究

摘要

The Jianhe Biota discovered in the“Tsinghsutung Formation”(Cambrian Stage 4) at Songshan (Jiugaoshan) Section near Balang Village, Jianhe County, Guizhou Province consists of soft-bodied fossils with abundant trilobites. Olenoides Meek, 1877 (Dorypygidae, Trilobita), ranging from Cambrian Duyunian (Stage 4) to the late Cambrian Guzhangian (Stage 7), is an important fossil for global stratigraphic correlation. This taxon from the“Tsinghsutung Formation”includes 2 species: Olenoides contrictus (Chien, 1961) and O. cf. hubeiensis (Sun, 1984) which are the primitive morphotypes of O. paraptus and O. hubeiensis that occurred in the overlying Kaili Formation. The Olenoides from the“Tsinghsutung Formation”(lower Duyunian, Qiandongian, global Cambrian Series 2) is known to be the lowermost occurrence for this genus. The discovery of Olenoides in the“Tsingsutung Formation”not only sheds new light on the early morphology, evolution, and distribution of this group, but also provides new constraint for the biostratigraphic study of Cambrian Stage 4 (Duyunian).%贵州剑河八郎松山（九高山）寒武系“清虚洞组”产有多门类具软躯体的生物群——剑河生物群，其中三叶虫非常丰富，属于叉尾虫科（Dorypygidae）的拟油栉虫（Olenoides Meek,1877），是一个重要的三叶虫属。Olenoides全球分布，出现于寒武纪第二世（都匀期），灭绝于寒武纪第三世（古丈期晚期），是进行地层对比重要的三叶虫。松山（九高山）“清虚洞组”中的Olenoides包括2个种（含1个相似种）：收缩拟油栉虫Olenoides contrictus （Chien,1961）及湖北拟油栉虫(相似种) O. cf. hubeiensis （Sun,1984），两者应为“清虚洞组”上覆地层凯里组产出的O. paraptus及O. hubeiensis的原始类型。Olenoides在寒武系黔东统都匀阶“清虚洞组”的发现，为其在研究区产出的最低层位。为Olenoides早期的形态、演化及时空分布的研究提供了重要的材料，也为寒武系都匀阶（第4阶）的生物地层研究提供了一些新的信息。