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Articulo Agnostida (Trilobita)
Dies, M.E. y Gozalo, R. 2004. Agnostida (Trilobita) de la Formación Valdemiedes (Leoniense: Cámbrico Medio basal) de las Cadenas Ibéricas (NE de España). Boletín Geológico y Minero, 115 (4): 683-698 ISSN: 0366-0176 Agnostida (Trilobita) de la Formación Valdemiedes (Leoniense: Cámbrico Medio basal) de las Cadenas Ibéricas (NE de España) M.E. Dies(1) y R. Gozalo(2) (1) Área y Museo de Paleontología. Facultad de Ciencias. Universidad de Zaragoza. E-50009 Zaragoza, España. E-mail: [email protected] (2) Departamento de Geología. Universitat de València. Dr. Moliner, 50. E-46100 Burjassot, España. E-mail: [email protected] RESUMEN El hallazgo de trilobites del Orden Agnostida del Leoniense Medio en las Cadenas Ibéricas (NE de España), así como material nuevo pro- cedente del Leoniense Inferior, han permitido completar el estudio taxonómico de este grupo en el Cámbrico Medio basal de este área. La presencia de dos poblaciones de la especie Condylopyge cruzensis Liñán y Gozalo, 1986 ha posibilitado realizar un estudio morfomé- trico y poblacional de la misma. Por otro lado, se ha identificado por primera vez el taxón Peronopsis aff. longinqua Öpik, 1979, lo que puede ser considerado como una herramienta más que apoye la correlación propuesta para el piso Leoniense y el Ordian/early Templentonian de Australia. Palabras clave: Agnostida, Cadenas Ibéricas, Cámbrico Medio, Formación Valdemiedes, Leoniense, trilobites Agnostida (Trilobita) from the Valdemiedes Formation (Leonian: low Middle Cambrian) of the Iberian Chains (NE Spain) ABSTRACT The discovery of Middle Leonian trilobites of the Agnostida Order in the Iberian Chains (NE Spain) together with new Lower Leonian mate- rial make possible to complete the taxonomic study of this group in the low Middle Cambrian of this area. -
A New Middle Cambrian Trilobite with a Specialized Cephalon from Shandong Province, North China
Editors' choice A new middle Cambrian trilobite with a specialized cephalon from Shandong Province, North China ZHIXIN SUN, HAN ZENG, and FANGCHEN ZHAO Sun, Z., Zeng, H., and Zhao, F. 2020. A new middle Cambrian trilobite with a specialized cephalon from Shandong Province, North China. Acta Palaeontologica Polonica 65 (4): 709–718. Trilobites achieved their maximum generic diversity in the Cambrian, but the peak of morphological disparity of their cranidia occurred in the Middle to Late Ordovician. Early to middle Cambrian trilobites with a specialized cephalon are rare, especially among the ptychoparioids, a group of libristomates featuring the so-called “generalized” bauplan. Here we describe an unusual ptychopariid trilobite Phantaspis auritus gen. et sp. nov. from the middle Cambrian (Miaolingian, Wuliuan) Mantou Formation in the Shandong Province, North China. This new taxon is characterized by a cephalon with an extended anterior area of double-lobate shape resembling a pair of rabbit ears in later ontogenetic stages; a unique type of cephalic specialization that has not been reported from other trilobites. Such a peculiar cephalon as in Phantaspis provides new insights into the variations of cephalic morphology in middle Cambrian trilobites, and may represent a heuristic example of ecological specialization to predation or an improved discoidal enrollment. Key words: Trilobita, Ptychopariida, ontogeny, specialization, Miaolingian, Paleozoic, Longgang, Asia. Zhixin Sun [[email protected]], Han Zeng [[email protected]], and Fangchen Zhao [[email protected]] (cor responding author), State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palae ontology and Center for Excellence in Life and Palaeoenvironment, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China. -
Biodiversity Patterns of Early–Middle Ordovician Marine Microphytoplankton in South China
Palaeogeography, Palaeoclimatology, Palaeoecology 299 (2011) 318–334 Contents lists available at ScienceDirect Palaeogeography, Palaeoclimatology, Palaeoecology journal homepage: www.elsevier.com/locate/palaeo Biodiversity patterns of Early–Middle Ordovician marine microphytoplankton in South China Kui Yan a,b,c,⁎, Thomas Servais c, Jun Li a,b, Rongchang Wu a, Peng Tang a,b a Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39, East Beijing Road, 210008 Nanjing, China b State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing 210008, China c FRE 3298 du CNRS, Géosystèmes, Université de Lille1, SN5, USTL, F-59655 Villeneuve d'Ascq, France article info abstract Article history: Based on new materials from six sections and all available literature data, new diversity curves are presented Received 22 June 2010 for the phytoplankton (acritarchs) from South China, covering the Early–Middle Ordovician interval, when Received in revised form 18 October 2010 the Great Ordovician Biodiversification Event took place. The total diversity curve and the origination data Accepted 9 November 2010 imply that a major radiation of the phytoplankton occurred during the analysed interval. A peak of the total Available online 13 November 2010 acritarch diversity curve appears in the A. suecicus graptolite biozone. The diversity changes vary in the different parts of the investigated area, most probably depending on the position of the analysed sections on Keywords: the carbonate shelf or the slope, reflecting diversity differences due to the position on an inshore–offshore Acritarchs Early–Middle Ordovician transect. South China The Early–Middle Ordovician diversity pattern of the phytoplankton is compared with those of several marine Biodiversity invertebrate groups. -
Fossils from South China Redefine the Ancestral Euarthropod Body Plan Cédric Aria1 , Fangchen Zhao1, Han Zeng1, Jin Guo2 and Maoyan Zhu1,3*
Aria et al. BMC Evolutionary Biology (2020) 20:4 https://doi.org/10.1186/s12862-019-1560-7 RESEARCH ARTICLE Open Access Fossils from South China redefine the ancestral euarthropod body plan Cédric Aria1 , Fangchen Zhao1, Han Zeng1, Jin Guo2 and Maoyan Zhu1,3* Abstract Background: Early Cambrian Lagerstätten from China have greatly enriched our perspective on the early evolution of animals, particularly arthropods. However, recent studies have shown that many of these early fossil arthropods were more derived than previously thought, casting uncertainty on the ancestral euarthropod body plan. In addition, evidence from fossilized neural tissues conflicts with external morphology, in particular regarding the homology of the frontalmost appendage. Results: Here we redescribe the multisegmented megacheirans Fortiforceps and Jianfengia and describe Sklerolibyon maomima gen. et sp. nov., which we place in Jianfengiidae, fam. nov. (in Megacheira, emended). We find that jianfengiids show high morphological diversity among megacheirans, both in trunk ornamentation and head anatomy, which encompasses from 2 to 4 post-frontal appendage pairs. These taxa are also characterized by elongate podomeres likely forming seven-segmented endopods, which were misinterpreted in their original descriptions. Plesiomorphic traits also clarify their connection with more ancestral taxa. The structure and position of the “great appendages” relative to likely sensory antero-medial protrusions, as well as the presence of optic peduncles and sclerites, point to an overall -
The Evolution of Trilobite Body Patterning
ANRV309-EA35-14 ARI 20 March 2007 15:54 The Evolution of Trilobite Body Patterning Nigel C. Hughes Department of Earth Sciences, University of California, Riverside, California 92521; email: [email protected] Annu. Rev. Earth Planet. Sci. 2007. 35:401–34 Key Words First published online as a Review in Advance on Trilobita, trilobitomorph, segmentation, Cambrian, Ordovician, January 29, 2007 diversification, body plan The Annual Review of Earth and Planetary Sciences is online at earth.annualreviews.org Abstract This article’s doi: The good fossil record of trilobite exoskeletal anatomy and on- 10.1146/annurev.earth.35.031306.140258 togeny, coupled with information on their nonbiomineralized tis- Copyright c 2007 by Annual Reviews. sues, permits analysis of how the trilobite body was organized and All rights reserved developed, and the various evolutionary modifications of such pat- 0084-6597/07/0530-0401$20.00 terning within the group. In several respects trilobite development and form appears comparable with that which may have charac- terized the ancestor of most or all euarthropods, giving studies of trilobite body organization special relevance in the light of recent advances in the understanding of arthropod evolution and devel- opment. The Cambrian diversification of trilobites displayed mod- Annu. Rev. Earth Planet. Sci. 2007.35:401-434. Downloaded from arjournals.annualreviews.org ifications in the patterning of the trunk region comparable with by UNIVERSITY OF CALIFORNIA - RIVERSIDE LIBRARY on 05/02/07. For personal use only. those seen among the closest relatives of Trilobita. In contrast, the Ordovician diversification of trilobites, although contributing greatly to the overall diversity within the clade, did so within a nar- rower range of trunk conditions. -
Abstract Volume
https://doi.org/10.3301/ABSGI.2019.04 Milano, 2-5 July 2019 ABSTRACT BOOK a cura della Società Geologica Italiana 3rd International Congress on Stratigraphy GENERAL CHAIRS Marco Balini, Università di Milano, Italy Elisabetta Erba, Università di Milano, Italy - past President Società Geologica Italiana 2015-2017 SCIENTIFIC COMMITTEE Adele Bertini, Peter Brack, William Cavazza, Mauro Coltorti, Piero Di Stefano, Annalisa Ferretti, Stanley C. Finney, Fabio Florindo, Fabrizio Galluzzo, Piero Gianolla, David A.T. Harper, Martin J. Head, Thijs van Kolfschoten, Maria Marino, Simonetta Monechi, Giovanni Monegato, Maria Rose Petrizzo, Claudia Principe, Isabella Raffi, Lorenzo Rook ORGANIZING COMMITTEE The Organizing Committee is composed by members of the Department of Earth Sciences “Ardito Desio” and of the Società Geologica Italiana Lucia Angiolini, Cinzia Bottini, Bernardo Carmina, Domenico Cosentino, Fabrizio Felletti, Daniela Germani, Fabio M. Petti, Alessandro Zuccari FIELD TRIP COMMITTEE Fabrizio Berra, Mattia Marini, Maria Letizia Pampaloni, Marcello Tropeano ABSTRACT BOOK EDITORS Fabio M. Petti, Giulia Innamorati, Bernardo Carmina, Daniela Germani Papers, data, figures, maps and any other material published are covered by the copyright own by the Società Geologica Italiana. DISCLAIMER: The Società Geologica Italiana, the Editors are not responsible for the ideas, opinions, and contents of the papers published; the authors of each paper are responsible for the ideas opinions and con- tents published. La Società Geologica Italiana, i curatori scientifici non sono responsabili delle opinioni espresse e delle affermazioni pubblicate negli articoli: l’autore/i è/sono il/i solo/i responsabile/i. ST3.2 Cambrian stratigraphy, events and geochronology Conveners and Chairpersons Per Ahlberg (Lund University, Sweden) Loren E. -
Atrocities in China
ATROCITIES IN CHINA: LIST OF VICTIMS IN THE PERSECUTION OF FALUN GONG IN CHINA Jointly Compiled By World Organization to Investigate the Persecution of Falun Gong PO Box 365506 Hyde Park, MA 02136 Contact: John Jaw - President Tel: 781-710-4515 Fax: 781-862-0833 Web Site: http://www.upholdjustice.org Email: [email protected] Fa Wang Hui Hui – Database system dedicated to collecting information on the persecution of Falun Gong Web Site: http://www.fawanghuihui.org Email: [email protected] April 2004 Preface We have compiled this list of victims who were persecuted for their belief to appeal to the people of the world. We particularly appeal to the international communities and request investigation of this systematic, ongoing, egregious violation of human rights committed by the Government of the People’s Republic of China against Falun Gong. Falun Gong, also called Falun Dafa, is a traditional Chinese spiritual practice that includes exercise and meditation. Its principles are based on the values of truthfulness, compassion, and tolerance. The practice began in China in 1992 and quickly spread throughout China and then beyond. By the end of 1998, by the Chinese government's own estimate, there were 70 - 100 million people in China who had taken up the practice, outnumbering Communist Party member. Despite the fact that it was good for the people and for the stability of the country, former President JIANG Zemin launched in July 1999 an unprecedented persecution of Faun Gong out of fears of losing control. Today the persecution of Falun Gong still continues in China. As of the end of March 2004, 918 Falun Gong practitioners have been confirmed to die from persecution. -
Soft Anatomy of the Early Cambrian Arthropod Isoxys Curvirostratus from the Chengjiang Biota of South China with a Discussion on the Origination of Great Appendages
Soft anatomy of the Early Cambrian arthropod Isoxys curvirostratus from the Chengjiang biota of South China with a discussion on the origination of great appendages DONG−JING FU, XING−LIANG ZHANG, and DE−GAN SHU Fu, D.−J., Zhang, X.−L., and Shu, D.−G. 2011. Soft anatomy of the Early Cambrian arthropod Isoxys curvirostratus from the Chengjiang biota of South China with a discussion on the origination of great appendages. Acta Palaeontologica Polonica 56 (4): 843–852. An updated reconstruction of the body plan, functional morphology and lifestyle of the arthropod Isoxys curvirostratus is proposed, based on new fossil specimens with preserved soft anatomy found in several localities of the Lower Cambrian Chengjiang Lagerstätte. The animal was 2–4 cm long and mostly encased in a single carapace which is folded dorsally without an articulated hinge. The attachment of the body to the exoskeleton was probably cephalic and apparently lacked any well−developed adductor muscle system. Large stalked eyes with the eye sphere consisting of two layers (as corneal and rhabdomeric structures) protrude beyond the anterior margin of the carapace. This feature, together with a pair of frontal appendages with five podomeres that each bear a stout spiny outgrowth, suggests it was raptorial. The following 14 pairs of limbs are biramous and uniform in shape. The slim endopod is composed of more than 7 podomeres without terminal claw and the paddle shaped exopod is fringed with at least 17 imbricated gill lamellae along its posterior margin. The design of exopod in association with the inner vascular (respiratory) surface of the carapace indicates I. -
The Late Ordovician Mass Extinction
P1: FXY/GBP P2: aaa February 24, 2001 19:23 Annual Reviews AR125-12 Annu. Rev. Earth Planet. Sci. 2001. 29:331–64 Copyright c 2001 by Annual Reviews. All rights reserved THE LATE ORDOVICIAN MASS EXTINCTION Peter M Sheehan Department of Geology, Milwaukee Public Museum, Milwaukee, Wisconsin 53233; e-mail: [email protected] Key Words extinction event, Silurian, glaciation, evolutionary recovery, ecologic evolutionary unit ■ Abstract Near the end of the Late Ordovician, in the first of five mass extinctions in the Phanerozoic, about 85% of marine species died. The cause was a brief glacial interval that produced two pulses of extinction. The first pulse was at the beginning of the glaciation, when sea-level decline drained epicontinental seaways, produced a harsh climate in low and mid-latitudes, and initiated active, deep-oceanic currents that aerated the deep oceans and brought nutrients and possibly toxic material up from oceanic depths. Following that initial pulse of extinction, surviving faunas adapted to the new ecologic setting. The glaciation ended suddenly, and as sea level rose, the climate moderated, and oceanic circulation stagnated, another pulse of extinction occurred. The second extinction marked the end of a long interval of ecologic stasis (an Ecologic-Evolutionary Unit). Recovery from the event took several million years, but the resulting fauna had ecologic patterns similar to the fauna that had become extinct. Other extinction events that eliminated similar or even smaller percentages of species had greater long-term ecologic effects. INTRODUCTION The Late Ordovician extinction was the first of five great extinction events of the by Universidad Nacional Autonoma de Mexico on 03/15/13. -
The Structure and Circulation of the Elite in Late-Tang China
elite in late-tang china nicolas tackett Great Clansmen, Bureaucrats, and Local Magnates: The Structure and Circulation of the Elite in Late-Tang China he predominant paradigm describing Chinese elite society of the T first millennium ad was defined thirty years ago in carefully re- searched studies by Patricia Ebrey and David Johnson, both of whom partly built upon the foundation of earlier scholarship by Takeda Ryˆji 竹田龍兒, Moriya Mitsuo 守屋美都雄, Niida Noboru 仁井田陞, Sun Guodong 孫國棟, Mao Hanguang 毛漢光, and others.1 According to this model, a circumscribed number of aristocratic “great clans” were able to maintain their social eminence for nearly a thousand years while simultaneously coming to dominate the upper echelons of the government bureaucracy. The astonishing longevity of these families was matched in remarkability only by their sudden and complete disap- pearance after the fall of the Tang at the turn of the tenth century. In their place, a new civil-bureaucratic scholar-elite came to the fore, an elite described in enormous detail first by Robert Hartwell and Robert I would like to thank the anonymous reviewers for their very helpful comments, as well as all of the participants in the 2007 AAS panel where I first presented this paper, notably the discussants Robert Hymes and Beverly Bossler. To minimize the number of footnotes, references for epitaphs of individuals are not included in the main text and notes, but in- stead can be found in the appendix. All tables are located at the end of the article, after the appendix. 1 David Johnson, “The Last Years of a Great Clan: The Li Family of Chao chün in Late T’ang and Early Sung,” H JAS 37.1 (1977), pp. -
1346 Editorial.Vp
The Precambrian-Cambrian biosphere (r)evolution: Insights from the Chinese Yangtze Platform OLDØICH FATKA, MICHAEL STEINER, BERND WEBER & MAOYAN ZHU The PC-C boundary interval represents one of the critical for understanding the drivers and mechanisms of the PC-C phases in the evolution of life. Any outside observer con- biosphere (r)evolution for the following reasons: sidering the approximately 4500-million-year history of (1) The sedimentary record covers the entire time inter- our planet would likely choose the 150 Ma time interval val from the Ediacaran to the middle Cambrian, whereas between 650 and 500 Ma as one of the most dramatic pe- the records on comparable platforms such as North China, riods in Earth history. This period connects the Protero- Australia, or Antarctica include larger stratigraphic hia- zoic and Phanerozoic Eons with its boundary at 542 Ma. It tuses: includes the Ediacaran (ca 630–542 Ma) and the Cam- (3) The facies diversity is associated with a broad range brian (542–493 Ma) periods. The Ediacaran, in particular, of laterally time-equivalent lithologies, including carbon- is characterized by concurrent profound changes in global ates, phosphorites, cherts, black shales, and minor tuffs. tectonics, possibly the largest climatic deviation from the (2) The region of platform sedimentation is large steady-state mean global temperature since the Archean (ca 1.8 million km2) and spans a wide facies spectrum, (popularized by the “Snowball Earth” concept; Hoffman ranging from erosional and evaporitic regimes over wide- & Schrag 2000), the first evidence leading to the possibly spread shallow-water marine environments to shelf-edge “explosive” (on a geological scale) but indisputably larg- (Lu et al. -
Central China Securities Co., Ltd
Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement, make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this announcement. Central China Securities Co., Ltd. (a joint stock company incorporated in 2002 in Henan Province, the People’s Republic of China with limited liability under the Chinese corporate name “中原証券股份有限公司” and carrying on business in Hong Kong as “中州証券”) (Stock Code: 01375) ANNUAL RESULTS ANNOUNCEMENT FOR THE YEAR ENDED 31 DECEMBER 2020 The board (the “Board”) of directors (the “Directors”) of Central China Securities Co., Ltd. (the “Company”) hereby announces the audited annual results of the Company and its subsidiaries for the year ended 31 December 2020. This annual results announcement, containing the full text of the 2020 annual report of the Company, complies with the relevant requirements of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited in relation to information to accompany preliminary announcements of annual results and have been reviewed by the audit committee under the Board. The printed version of the Company’s 2020 annual report will be dispatched to the shareholders of the Company and available for viewing on the website of Hong Kong Exchanges and Clearing Limited at www.hkexnews.hk, the website of the Shanghai Stock Exchange at www.sse.com.cn and the website of the Company at www.ccnew.com on or before 30 April 2021.