The Early Cambrian Balang Formation is comprised of mudrock and shale, which was deposited in a shelf environment in the eastern part of Guizhou, south China. The Balang Fauna, which consists of seven phyla, occurs in the middle and upper parts of the Balang Formation. Arthropods are important constituents of the Balang Fauna and include a great number of trilobites, large bivalved arthropods, and newly-discovered well-preserved bradoriid fossils. The bradoriids present include three genera and four species ： Comptaluta inflata （Cheng, 1974） emend Hou et al., 2002; Comptaluta kailiensis sp. nov., and Alutella elongeta sp. nov, Aluta sp. This faunal assemblage in the Balang Formation is distinguished from the Tsunyiella Chang, 1964, Songlinella Yin, 1978 and Kunmingella Hou, 1956 assemblage which occurs in the Niutitang and Mingxinsi formations of the Yangtze Platform in middle region of Guizhou and which is earlier than the Balang Formation in age. However, this assemblage resembles the Comptaluta Opik, 1968 assemblage from the Early Cambrian Heilinpu Formation in Wuding County, Yuanan Province and from the Ordian Stage of the Cambrian of Australia. The great abundance of Comptaluta Opik, 1968 and overall taxonomic diversity of the Comptaluta Opik, 1968 assemblage set it distinctly apart from theAlutella Kobayashi et Kato, 1951 and Aluta Hou, 1956 assemblages of the Balang Formation. Alutella Kobayashi et Kato, 1951 and Aluta Hou, 1956 also occur in the Early Cambrian Niutitang Formation of the Yangtze Platform of Guizhou. Individual Bradoriids from the Balang Formation are characterized by large size （〉3 mm）. The discovery of new Bradoriid assemblages not only expands the group＇s geographical range and assemblage affinities, but also indicates that Bradoriids migrated eastward from shallow-water to deeper-water environments during the Early Cambrian, indicating that they were capable of life in deeper-water, and adaptation to a new ecological setting.
PENG JinFENG HongzhenFU XiaopingZHAO YuanlongYAO Lu
岑巩县羊桥乡罗家塘杷榔组仅出露中-上部地层,岩性单一,均为青灰、灰绿色粉砂质泥、页岩。在其上部层位发现了俞氏贵州始海百合(Guizhoueocrinus yui Zhao,Parsley et Peng,2007),计有棘皮动物始海百合、腕足动物、软体动物——软舌螺、节肢动物--三叶虫等8属9种,包括了2个未定名的新种和1未定种,与凯里市杷榔组的杷榔动物群相似。新的发现扩展了杷榔动物群的地理分布,提供了群落生态及埋藏学研究的新材料,具有重要的科学和实践意义。
回顾近年来所发现的与我国三叶虫有关的11个晚出同名属及其替代名的研究现状,详细报导最近新发现的37个晚出同名三叶虫属中的13个属及其替代名。这些属涉及到寒武纪,奧陶纪,志留纪和泥盆纪的三叶虫。此外,河南龙Honania Young,1979(模式种H.complicidentata Young,1979)是产于河南济源晚二叠世爬行类锯齿龙科的一个属,由于晚于三叶虫河南虫HonaniaLee in Luet al.,1963(模式种H.lata Lee in Luet al.,1963)所建,成为无效属名,建议将河南龙的属名更名为钟键龙(新属)Zhongjiania gen.nov.。
