A crown group priapulid from the early Cambrian Guanshan Lagerstätte

2017 ◽  
Vol 154 (6) ◽  
pp. 1329-1333 ◽  
Author(s):  
SHI-XUE HU ◽  
MAO-YAN ZHU ◽  
FANG-CHEN ZHAO ◽  
MICHAEL STEINER
Keyword(s):  
Yunnan Province ◽  
The Body ◽  
Early Cambrian ◽  
Caudal Appendage ◽  
Crown Group ◽  
Stage 4 ◽  
Mazon Creek ◽  
Chengjiang Lagerstätte ◽  
Moscovian Stage ◽  
New Discovery

AbstractA well-preserved fossil priapulid worm, Xiaoheiqingella sp., is reported from the early Cambrian Guanshan Lagerstätte (Cambrian Series II, Stage 4) near Kunming City, Yunnan Province, SW China. The body of the animal consists of four sections: a swollen introvert, a constricted neck, a finely annulated trunk and a caudal appendage. The body configuration exhibits a close resemblance to that of the crown group priapulid Xiaoheiqingella peculiaris from the early Cambrian Chengjiang Lagerstätte. The new discovery provides another striking example of crown group priapulids, representing the third occurrence of crown group fossil priapulids after the Chengjiang Lagerstätte (Cambrian Series II, Stage 3) and the Mazon Creek Lagerstätte (late Moscovian Stage, Pennsylvanian). The discovery also sheds new light on the early diversity and evolution of priapulid worms.

A New Helmetiid Arthropod from the Early Cambrian Chengjiang Lagerstätte, Southwest China

2014 ◽  
Vol 88 (2) ◽  
pp. 367-370 ◽  
Author(s):  
Fangchen Zhao ◽  
Shixue Hu ◽  
Han Zeng ◽  
Maoyan Zhu
Keyword(s):  
Yunnan Province ◽  
Anterior Margin ◽  
New Genus ◽  
Southwest China ◽  
Posterolateral Corner ◽  
Early Cambrian ◽  
Body Width ◽  
Total Body ◽  
Chengjiang Lagerstätte ◽  
Cephalic Shield

A new arthropod, Haifengella corona new genus new species is described from the early Cambrian Chengjiang Lagerstätte (Series 2, Stage 3), Yunnan Province, southwest China. It is readily assignable to helmetiida based on gross morphology of the tergum. The new helmetiid is unique in having the marginal spines extending over one-third of the total body width. The weakly sclerotized tergum consists of six thoracic tergites with edge-to-edge tergite articulations. The sub-trapezoidal cephalic shield has a pair of long spines projecting from each posterolateral corner. A prehypostomal sclerite (anterior sclerite) recesses in the anterior margin of the cephalic shield, and a pair of bulges that are close to the prehypostomal sclerite in the cephalic shield are presumed to be the position of ventral eyes. Each of the thoracic tergites exhibits a pair of long spines projecting from the posterolateral corners. The semicircular pygidium carries one terminal spine and two pairs of lateral spines.

A new Early Cambrian onychophoran-like animal, Paucipodia gen. nov., from the Chengjiang fauna, China

1994 ◽  
Vol 85 (4) ◽  
pp. 275-282 ◽  
Author(s):  
Chen Jun-yuan ◽  
Zhou Gui-qing ◽  
Lars Ramsköld
Keyword(s):  
Lower Cambrian ◽  
The Body ◽  
Early Cambrian ◽  
Posterior Trunk ◽  
Trunk Extension ◽  
Chengjiang Lagerstätte

AbstractAn onychophoran-like fossil animal, Paucipodia inermis gen. et sp. nov., is described from the Lower Cambrian Chengjiang lagerstatte in Yunnan, China. The animal was soft-bodied, and possessed six pairs of unjointed legs, each having two claws distally. The body was finely annulated, lacked trunk plates, and apparently terminated posteriorly with the last leg pair, without preserved evidence of a posterior trunk extension. Paucipodia widens the morphological range hitherto known in Cambrian lobopodians, notably regarding leg number and presence or absence of plates. Its morphology also provides support for the recently suggested anteroposterior orientation of Hallucigenia and Microdictyon.

scholarly journals An Early Cambrian stem polychaete with pygidial cirri

2011 ◽  
Vol 7 (6) ◽  
pp. 929-932 ◽  
Author(s):  
Jakob Vinther ◽  
Danny Eibye-Jacobsen ◽  
David A. T. Harper
Keyword(s):  
The Body ◽  
Early Cambrian ◽  
Crown Group ◽  
Total Group ◽  
Stem Group ◽  
First Time

The oldest annelid fossils are polychaetes from the Cambrian Period. They are representatives of the annelid stem group and thus vital in any discussion of how we polarize the evolution of the crown group. Here, we describe a fossil polychaete from the Early Cambrian Sirius Passet fauna, Pygocirrus butyricampum gen. et sp. nov., with structures identified as pygidial cirri, which are recorded for the first time from Cambrian annelids. The body is slender and has biramous parapodia with chaetae organized in laterally oriented bundles. The presence of pygidial cirri is one of the characters that hitherto has defined the annelid crown group, which diversified during the Cambrian–Ordovician transition. The newly described fossil shows that this character had already developed within the total group by the Early Cambrian.

A New Exceptionally Preserved Cambrian Priapulid from the Chengjiang Lagerstätte

2014 ◽  
Vol 88 (2) ◽  
pp. 371-384 ◽  
Author(s):  
Xiaoya Ma ◽  
Richard J. Aldridge ◽  
David J. Siveter ◽  
Derek J. Siveter ◽  
Xianguang Hou ◽  
...  
Keyword(s):  
New Species ◽  
Alimentary Canal ◽  
New Genus ◽  
Cladistic Analysis ◽  
The Body ◽  
Crown Group ◽  
Exceptional Preservation ◽  
Character Matrix ◽  
Deposit Feeding ◽  
Chengjiang Lagerstätte

A fossil priapulid, Eximipriapulus globocaudatus new genus new species, is described from the Cambrian Chengjiang Lagerstätte of Yunnan, China. The exceptional preservation of the animal reveals morphological details that allow direct comparison with extant priapulids. The body is divisible into a partially eversible pharynx, a smooth collar, a scalid-bearing introvert, a neck with triangular scalids, an unsegmented trunk with annulations, and a distinctly expanded terminal region. Several specialized regions of the alimentary canal are recognized: a pharynx (lined by cuticle and bearing teeth), esophagus, midgut, hindgut, and a terminal anus. The sample includes a putative juvenile. The animal is inferred to have been an active burrower using a double-anchor strategy, practicing both deposit feeding and carnivory. Inclusion of Eximipriapulus in the most recent character matrix for cladistic analysis of fossil and Recent priapulids resolves the new genus within the priapulid crown group.

A New Platy-armored Worm from the Early Cambrian Chengjiang Lagerstätte, South China

2010 ◽  
Vol 77 (1) ◽  
pp. 1-6 ◽  
Author(s):  
HAN Jian ◽  
ZHANG Xingliang ◽  
ZHANG Zhifei ◽  
SHU Degan
Keyword(s):  
South China ◽  
Early Cambrian ◽  
Chengjiang Lagerstätte

Diverse pelagic predators from the Chengjiang Lagerstätte and the establishment of modern-style pelagic ecosystems in the early Cambrian

2007 ◽  
Vol 254 (1-2) ◽  
pp. 307-316 ◽  
Author(s):  
Shixue Hu ◽  
Michael Steiner ◽  
Maoyan Zhu ◽  
Bernd-Dietrich Erdtmann ◽  
Huilin Luo ◽  
...  
Keyword(s):  
Early Cambrian ◽  
Modern Style ◽  
Chengjiang Lagerstätte ◽  
Pelagic Ecosystems

scholarly journals Tarimspirafrom the Cambrian (Series 2, Stage 4) of Laurentia (Greenland): extending the skeletal record of paraconodontid vertebrates

2018 ◽  
Vol 93 (1) ◽  
pp. 115-125
Author(s):  
John S. Peel
Keyword(s):  
New Species ◽  
Type Species ◽  
Weak Acid ◽  
Early Cambrian ◽  
Basal Cavity ◽  
Stage 4 ◽  
First Time ◽  
A New Species ◽  
North Greenland

AbstractPhosphatic sclerites of the problematicTarimspiraYue and Gao, 1992 (Cambrian Series 2) recovered by weak acid maceration of limestones display a unique range of mainly strongly coiled morphologies. They were likely organized into multielement scleritomes, but the nature of these is poorly known; some sclerites may have had a grasping function.Tarimspirasclerites grew by basal accretion in an analogous fashion to younger paraconodonts (Cambrian Series 3–4) but lack a basal cavity. Based on proposed homologies,Tarimspiramay provide an extension of the early vertebrate paraconodont–euconodont clade back into the early Cambrian.Tarimspirais described for the first time from Laurentia (North Greenland), extending its known range from China and Siberia in Cambrian Series 2. In addition to the type species,Tarimspira planaYue and Gao, 1992, the Greenland record ofTarimspiraincludes two morphotypes of a new species,Tarimspira artemi.UUID:http://zoobank.org/c7c536c8-cdaf-49a9-ae1d-77c392f553fc.

New well-preserved scleritomes of Chancelloriida from early Cambrian Guanshan Biota, eastern Yunnan, China

2018 ◽  
Vol 92 (6) ◽  
pp. 955-971 ◽  
Author(s):  
Jun Zhao ◽  
Guo-Biao Li ◽  
Paul A. Selden
Keyword(s):  
New Species ◽  
Detailed Comparison ◽  
The Body ◽  
Single Element ◽  
Early Cambrian ◽  
Top Down ◽  
Middle Cambrian ◽  
Unusual Form ◽  
Guanshan Biota ◽  
A New Species

AbstractA large number of well-preserved chancelloriid scleritomes from the Guanshan biota, early Cambrian of Yunnan, China, are described as a new species,Allonnia tenuisn. sp., and provide solid evidence for the original appearance of these enigmatic animals, based on specimens compacted laterally and top-down. With the assistance of a flexible integument, chancelloriids, especiallyAllonniafrom early and middle Cambrian, may have had the ability to partially or completely expand and contract the body, which might have played an important role in feeding. A new metazoan with single-element spines,Nidelric gaoloufangensisn. sp., is also described. Preservation and affinity are discussed. Detailed comparison of the morphology of the body and spines of this metazoan indicate that it shares many similarities with chancelloriids, of which it may be an unusual form.UUID:http://zoobank.org/2708d95a-1fae-46fc-afea-9707ae97a4d7

(b) Textbooks: • What is being described? • Do I understand? • Does it fit with my understanding of the cases? • Have I properly grasped the issues involved? • What is of relevance to my essay? (c) Articles: • What is the writer’s argument? • Is it well supported by the evidence? • Does the writer’s argument support or deny my argument in the essay? Is there a majority view developing in the texts concerning any of the issues raised by the question? Go back to the diagram of the essay question made under Stage 1. Note beside the various issues aspects of the texts that are of relevance to the issues identified as requiring discussion to answer the question. It is important to remain open to the possibility that personal ideas may change as more research is conducted and some texts present persuasive arguments that had not been previously considered. (4) Stage 4: begin to form a view of possible arguments to be used to answer the question Add these to your diagram. (5) Stage 5: consider the strength of your argument This stage is important. You should by now have a reasonably clear idea of how your argument may look. You will know what supporting evidence you have and where you lack support. Argument construction has been specifically dealt with in this text and can be located in Chapter 7. You do not have to throw out weak arguments if they serve to build a broader picture and support a broader argument. (6) Stage 6: begin to write the essay plan Look at: • the diagram of the question; • the notes of cases and other texts; • the notes of your personal ideas/argument. (7) Stage 7: write the first draft of the essay Although you will have an idea of what you are doing and where you are going and indeed what your answer is to the question it is a good idea to start your detailed first draft in the body of the text.

2012 ◽  
pp. 269-269
Keyword(s):  
The Body ◽  
Supporting Evidence ◽  
Stage 4 ◽  
Essay Question ◽  
Clear Idea ◽  
Stage 1 ◽  
Persuasive Arguments
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