论早寒武世三叶虫大古油栉虫属  

ON THE GENUS MEGAPALAEOLENUS CHANG,1966

作　　者：罗惠麟[1] 李勇 胡世学[1] 傅晓平 侯蜀光[1] 尤霆 庞纪院 刘琦[3] 

机构地区：[1]云南省地质科学研究所,昆明650051 [2]深圳古生物博物馆,广东深圳518004 [3]中国地质大学地球科学学院,武汉430074

出　　处：《古生物学报》2007年第3期314-326,共13页Acta Palaeontologica Sinica

基　　金：科技部重大基础前期研究专项(2002CCA03300);国家自然科学基金项目(40672004);国家重点基础研究发展规划项目(2006CB806401);云南省地质科学研究所项目(YIGS-2005-01);云南省地质科学研究所与深圳古生物博物馆合作研究项目(YIGS-2006-01)联合资助课题

摘　　要：报道采自云南昆明高楼房及武定石将军乌龙箐组剖面古油栉虫类(palaeolenid)的新材料。详细研究和比较后确认Mansuy(1912)所建立Palaeolenus属的3个种特征明显,特别是P.deprati Mansuy与P.douvillei Mansuy区别较大,不能合并为一个种;以Palaeolenusdeprati Mansuy为模式种建立的Megapalaeolenus Chang,1966应该成立。根据地层分布,下寒武统沧浪铺阶上部的Palaeolenus和Megapalaeolenus两个化石带仍然适用于华中、西南地区早寒武世中期的地层划分,华北和东北南部只存在Megapalaeolenus带的地层,而Palaeolenus带的地层缺失。The genus Palaeolenus Mansuy, estabished by Mansuy in 1912, includes three species.. P. douvillei Mansuy, P. lantenoisi Mansuy, and P. deprati Mansuy. In 1966, Chang （1966） renamed the third one—— Palaeolenus deprati Mansay ——under the genus Megapalaeolenus Chang. Howerver, it was quite recently that Lin and Peng （2004） contradicted its validity, for they considered its type species to he synonyrnous with P. douvillei, and referred Megapalaeolenus to the Upper Canglanpuan Palaeolenus instead. Our recent study of palaeolenid trilobits and their stratigraphic distribution in the Shitangshan Section, Gaoloufang, Kunming and the Shijiangjun Section, Wuding shows that the features of the three species of Palaeolenus named after Mansuy （1912） are distinct, especially in P. deprati and P. douvillei. The evidence for genus status of Megapalaeolenus Chang, 1966 is sufficient and thus the two species can not he merged. The Palaeolenus Zone and the Megapalaeolenus Zone of the Lower Cambrian Canglanpuan Stage exist widely in the central and southwest part of China, while the Megapalaeolenus Zone exists only in the northern part of China or very southern part of Northeast China. Systematic palaeontology Superfamily Ellipsocephalacea Matthew, 1887 Family Palaeolenidae Hupè,1953 Genus Palaeolenus Mansuy, 1912 Type species Palaeolenus douvillei Mansuy, 1912 Diagnosis Small, elongate ellipitical in outline. Cephalon semicircular, cranidium sub-quadrate, glabella rectangular, occasionally contracted at the middle part, with 4 pairs of glabellar furrows. Dorsal furrows distinct. Eye ridges long. Eye lobes small. Preglabellar field well developed. Anterior cephalic border narrow and convex. Fixigena wide. Posterior limb short. Librigena narrow. Genal spines small and short. Anterior branch of the facial suture extends slightly outward. Posterior branch of the facial suture short. Thorax with 13-14 thoracic segments. Axial lobe smooth, with small nodes occasionally. Pygidium small, semi-elliptical in

关 键 词：三叶虫 Palaeolenus Megapalaeolenus 沧浪铺阶 下寒武统 昆明 武定 云南 

分 类 号：Q915[天文地球—古生物学与地层学]