Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Acta Palaeontologica Sinica》 1985-06
Add to Favorite Get Latest Update

PRELIMINARY NOTES ON THE OCCURRENCE OF THE UNUSUAL TRILOBITE NARAOIA IN ASIA

Zhang Wen-tang and Hou Xian-guang (Nanjing Institute of Geology and Palaeontology, Academia Sinica)  
In 1984, while collecting bradoriids from the early Lower Cambrian Chiumgchussu Formotion of Chengjiang, eastern Yunnan, the junior author unexpectedly discovered a yellowish muddy shale bed which contains remarkably preserved fossils including brachiopods, bradoriids, annelids, medusdid, trilobite Naraoia and many other arthropods. Judged from the presence of the trilobites Eoredlichia intermedia (Lu), Yunnanocephalus yunnancnsis (Mausuy), Kuanyangia sp. and the bradoriids Kwnmingella, Liangshanella, the shale bed undoubtedly belongs to the basal part of the Eoredlichia-Wutingaspis Zone of the Early Cambrian Chiungchussu Stage. It is very interesting to note that humdreds of specimens with well-preserved antenna, alimentary canal, alimentary diverticula, biramous appendages and hypostoma, etc., represent two species of the unusual trilobite Naraoia, i.e., N. longicaudata sp. nov. and N. spinosa sp. nov..The dorsal exoskeleton of N. longicaudata is divided into two shields, with the posterior one more elongate and nearly twice as long as the anterior one. Posterolateral angles of the anterior shield are rounded, lacking a pair of posterolateral spines. Tips of the appendages project out from below the shields. One specimen is shown to have up to, 22 pairs of biramous, trilobite-like appendages, with the three anterior pairs belonging to the anterior shield, following the rounded quadrate hypostoma, which is divided by a very narrow median furrow into a large broadly conical and convex anterior lobe with broadly rounded front, and a narrowly (sag., exsag.) flattened posterior lobe. The lateral border of hypostoma is relatively broad and flat. A very small trapezoidal plate just situated sagittally behind the hypostoma probably represents the metastoma. Biramous appendages are of the same type as those shown by Whittington (1977). This new species differs from Naraoia compacta Walcott 1912, the type species of this genus, in the longer and narrower posterior shield, the more pairs of biramous appendages, and the absence of posterolateral spines on the anterior shield.The second species, N. spinosa based on 30 odd well-preserved specimens is characterized by seven or nine pairs of lateral small spines and a pair of larger posterolateral spines on the margin of the posterior shield, by a pair of posterolateral spines on the anterior shield, and by the less (ca. 17 or 18) pairs of biramous appendages. The axial region is poorly defined and the alimentary canal may be filled with sediments. The filling is preserved in various shapes, which appears clavate in the anterior and gradually becomes narrower toward the posterior (pl. Ⅳ, fig. 1), narrower in the middle, and broader both anteriorly and posteriorly (pl. Ⅲ, fig. 5), or broader rodlike more or less in the same width, or even zigzag in parttern (pl. Ⅳ, fig. 1). Whittington (1977) pointed out that these variations presumably reflect either the amount of filling at the time of dying out, or the effects of com. pression, or possibly the segmentation of the body. Well-preserved, lateral diverticula originate from the anterolateral extremity of alimentary canal by a transverse (pl. Ⅲ, fig. 5) or forward obliquely directed trunk situated a little behind the midlength of the anterior shield (pl. Ⅳ, fig. 1); this trunk bifurcates into two branches, with one running forward and the other directing outward and backward; from these main divisions others originate and subdivide on the outer side. The subdivisions terminate blindly right within the margin of the anterior shield, unconnected by a marginal canal. These. lateral diverticula are limited to the area of the anterior shield. The posterior margin of the posterior shield is straight or slightly concave. This species differs from N. longicaudata in having well-preserved posterolateral and lateral spines on the anterior and posterior shield respectivoly. Length of its posterior shield is proportionally smaller tham that of N. longicaudata, and the posterior margin is straight or slightly concave instead of well rounded. In the shape of anterior shield, this species is very similar to N. spinifer Walcott, 1931 (Whittington, 1977, pl. 16, fig. 91), but differs from the latter in having a pair of larger posterior lateral spines and a straight or concave posterior margin on the posterior shield.The occurrence of Naraoia and-other nontrilobite arthropods from eastern Yunnan is of great significance for the further study of the Cambrian animal kingdom and palaeogeography on both sides of the Pacific Ocean. Broadly speaking, the Cambrian geology and palaeontology in Asia, especially in eastern Asia, are more intimately related to those in North America than in Western and Northern Europe. More detailed discussion and description of these two species of Naraoia will be published in another paper written in English.
【Key Words】:
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
【References】
Chinese Journal Full-text Database 10 Hits
1 Luo Hui-lin;The Chinese Late Precambrian-Early Cambrian biological events and the Precambrian-Cambrian boundary[J];Journal of Stratigraphy;1992-01
2 Chen Menge (Institute of Geology, Academia Sinica, Beijing 100029);PROGRESS AND PROSPECT IN THE STUDIES ON EARLY EVOLUTION OF LIFE IN CHINA[J];Advance in Earth Sciences;1993-02
3 SHU De-gan~ 1,2 , Simon CONWAY MORRIS~ 3 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China 2. Early Life Institute, Northwest University, Xi'an 710069, China 3. Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ;New diploblasts from Chengjiang fossil lagersttte[J];Earth Science Frontiers;2006-06
4 Luo Huilin, Hu Shixue(Yunnan Institute of Geological Sciences?Kunming, Yunnan)Zhang Shishan and Tao Yonghe(Kunyang Phosphorite Mine, Jinning, Yunnan);NEW OCCURRENCE OF THE EARLY CAMBRIAN CHENG JIANG FAUNA FROM HAIKOU,KUNMING,YUNNAN PROVINCE,AND STUDY ON TRILOBIROIDEA[J];Acta Geologica Sinica;1997-02
5 Chen Jun-yuan Hou Xian-guang Lu Hao-zhi (Nanjing Institute of Geology and Palatontology,Academia Sinica);EARLY CAMBRIAN NETTED SCALE-BEARING WORM-LIKE SEA ANIMAL[J];Acta Palaeontologica Sinica;1989-01
6 Chen Jun-yuan Hou Xian-guang Lu Hao-zhi (Nanjing Institute of Geology and Palaeontology,Academia Sinica);LOWER CAMBRIAN LEPTOMITIDS(DEMOSPONGEA),CHENGJIANG,YUNNAN[J];Acta Palaeontologica Sinica;1989-01
7 Cui Zhi-lin and Huo Shi-cheng(Department of Geology, Northwest University, Xi'an);NEW DISCOVERIES OF LOWER CAMBRIAN CRUSTACEAN FOSSILS FROM WESTERN HUBEI[J];Acta Palaeontologica Sinica;1990-03
8 Chen Jun-yuan, Hou Xian-guang and Li Guo-xiang (Nanjing Institute of Geology and Palaeontalogy, Academia Sinica);NEW LOWER CAMBRIAN DEMOSPONGES——QUADROLAMINI-ELLA GEN. NOV. FROM CHENGJIANG, YUNNAN[J];Acta Palaeontologica Sinica;1990-04
9 ZHAO Yuan Long 1) , YUAN Jin Liang 2) , ZHU Mao Yan 2) , YANG Rui Dong 1) GUO Qing Jun 1) , QIAN Yi 2) , HUANG You Zhuang 1) and PAN Yu 1) Department of Resource Engineering, Guizhou University of Technology, G;A PROGRESS REPORT ON RESEARCH ON THE EARLY MIDDLE CAMBRIAN KAILI BIOTA, GUIZHOU, PRC[J];ACTA PALAEONTOLOGICA SINICA;1999-S1
10 ZHAO Yuan Long 1) , M.STEINER 2) , YANG Rui Dong 1) , B. D.ERDTMANN 2) GUO Qing Jun 1) , ZHOU Zhen 1) and E.WALLIS 2) 1) Department of Resource Engineering, Guizhou University of Technology,Guiyang 550003 2) Technisch;DISCOVERY AND SIGNIFICANCE OF THE EARLY METAZOAN BIOTAS FROM THE LOWER CAMBRIAN NIUTITANG FORMATION ZUNYI,GUIZHOU,CHINA[J];ACTA PALAEONTOLOGICA SINICA;1999-S1
【Co-references】
Chinese Journal Full-text Database 10 Hits
1 Luo Hui-lin;The Chinese Late Precambrian-Early Cambrian biological events and the Precambrian-Cambrian boundary[J];Journal of Stratigraphy;1992-01
2 Ding Qixiu(Hubei Institute of Geology) Chen Yiyuan (Wuhan College of Geology);DISCOVERY OF SOFT METAZOAN FROM THE SINIAN SYSTEM ALONG EASTERN YANGTZE GORGE,HUBEI[J];;1981-02
3 Liu Xiao liang Shenyang Institute of Geology and Mineral Resources,Chinese Academy of Geological Sciences;METAZOA FOSSILS FROM MASHAN GROUP NEAR JIXI, HEILONGJIANG[J];;1981-00
4 SHU De-gan~ 1,2 , Simon CONWAY MORRIS~ 3 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China 2. Early Life Institute, Northwest University, Xi'an 710069, China 3. Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ;New diploblasts from Chengjiang fossil lagersttte[J];Earth Science Frontiers;2006-06
5 Zhang Wentang(Institute of Geology and Palaeontology, Academia Sinica, Nanjing, 210008);CAMBRIAN EXPLOSION AND SIGNIFICANCE OF THE CHENGJIANG FAUNA[J];EARTH SCIENCE FRONTIERS;1997-Z2
6 Zhong Hua;PRELIMINARY STUDY ON THE ANCIENT FAUNA OF SOUTH CHINA AND ITS STRATIGRAPHIC SIGNIFICANCE[J];Chinese Journal of Geology;1977-02
7 Chen Menge (Institute of Geology, Academia Sinica, Beijing)Zheng Wenwu (Department of Geology, Hefei Polytechnical University, Hefei);ON THE PRE-EDIACARAN HUAINAN BIOTA[J];Chinese Journal of Geology;1986-03
8 Chen Menge(Institute of Geology, Academia Sinica, Beijing);SOME ASPECTS OF STUDIES ON LATE PRECAMBRIAN MACROFOSSILS IN CHINA[J];Chinese Journal of Geology;1989-03
9 Chen Menge(Institute of Geology, Acalemta Siaica, Beijing 100029);DISCUSSION ON THE STRATIGRAPHIC SIGNIFICANCE OF MACROFOSSILS FROM THE LATE PRECAMBRIAN SEQUENCE IN SOUTHERN LIAONING PROVINCE[J];Chinese Journal of Geology;1991-02
10 Chen Menge(Institute of Geology, Academia Sinica, Beijing 100029)Xiao Zongzheng(Institute of Geology, Beijing Bureau of Geology and Mineral Resources, Beijing 100011);DISCOVERY OF THE MACROFOSSILS IN THE UPPER SINIAN DOUSHANTUO FORMATION AT MIAOHE, EASTERN YANGTZE GORGES[J];Chinese Journal of Geology;1991-04
【Secondary References】
Chinese Journal Full-text Database 10 Hits
1 YANG Rui-dong 1,2 ZHAO Yuan-long 2 MAO Jia-ren 2 NIE Ai-guo 2 CHEN Xiao-yuan 2 1 (The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002) 2 (Guizhou University of Te;Paleoecology of the Kaili Biota from Middle Cambrian in Taijiang County, Guizhou Province, China[J];Acta Sedimentologica Sinica;2002-01
2 YANG Rui dong ZHANG Wei hua JIANG Li jun GAO Hui (Guizhou University of Technology, Guiyang 550003 );Fossil Preservation and Palaeoecological Research in Early Cambrian Black Shale[J];Acta Sedimentologica Sinica;2004-04
3 Shan Wei-guo (Yunnan Burean of Geology and Mineral Resources,Kunming,650214);Subtitute Hongjingshao Fm.,Wulongqing Fm.for Lower Cambrian Tsanglangpu Fm.of Eastern Yunnan[J];Journal of Stratigraphy;1996-03
4 WANG Yue 1)2), YU You-yi 2), PENG Jin 2), and WANG Ping-li 2)( 1) School of Earth Sciences and Resources, China University of Geosicences, Beijing, 100083;2)School of Resources and Environment, Guizhou University, Guiyang, 550003);DISCUSSION ON THE SEQUENCE STRATIGRAPHY AND SEA-LEVEL CHANGES OF THE KAILI FORMATION AT BALANG, TAIJIANG, GUIZHOU[J];Journal of Stratigraphy;2006-01
5 YANG Ai-hua 1),ZHU Mao-yan 2)and ZHANG Jun-ming 2)1)The Earth Science Department of Nanjing University,Nanjing 210093;2)LPS,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008;CHRONOSTRATIGRAPHY OF CAMBRIAN HUANGBOLING AND HETANG FORMATIONS IN SOUTHERN ANHUI AND WESTERN ZHEJIANG[J];Journal of Stratigraphy;2008-04
6 HUANG Huai-yong,WANG Dao-jing,CHEN Guang-hao,YIN Han-hui (Guangzhou Institute of Geochemistr y,Academia Sinica,Guangzhou,Guangdong410013,China);DISTRIBUTION AND ANALYSIS OF OBJECTIVE STRATUM RELATED TO POSSIBLE IMPACTED EVENTS ON BOUNDARY OF THE SINIAN/CAMBRIAN IN TIANMENSHAN[J];Geotectonica Et Metallogenia;2002-03
7 HUA Hong 1) ZHANG Luyi 2) XIE Congrui 2) ( 1)Northwest University, Xi'an, Shaanxi, 710069; 2)Xi'an Institute of Geology and Mineral Resource, Xi'an, Shaanxi, 710054);The New Discovery of Peculiar Skeleton Fossils from the Uppermost Neoproterozoic Strata in South Shaanxi and Its Significance[J];Acta Geosicientia Sinica;2002-05
8 CHANG Xiangyang 1,2) CHEN Liangzhong 3) HU Shixue 3) WANG Jianghai 1) ZHU Bingquan 1) ( 1)Guangzhou Institute of Geochemistry,CAS,Guangzhou,Guangdong,510640;2)Department of Environmental Science,Guangzhou University,Guangzhou,Guangdong,510405;3)Yunnan Institute of Geological Sciences,Kunming,Yunnan,650011);Pb-Pb Isotope Dating of the Chengjiang Fauna-bearing Beds[J];Acta Geosicientia Sinica;2004-02
9 Li Yanhe Wan Defanng Jiang Shaoyong(Institute of mineral Deposits,CAGS)Zhang Hua(Institute of Geology,Academica Sinica);SILICON ISOTOPE STUDY ON THE MEISHUCUN PRECAMBRIAN─CAMBRIAN BOUNDARY SECTION,YUNNAN PROVINCE[J];;1994-Z1
10 Chen Menge (Institute of Geology, Academia Sinica, Beijing 100029);PROGRESS AND PROSPECT IN THE STUDIES ON EARLY EVOLUTION OF LIFE IN CHINA[J];Advance in Earth Sciences;1993-02
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved