scholarly journals Paterimitra pyramidalisfrom South Australia: scleritome, shell structure and evolution of a lower Cambrian stem group brachiopod

Palaeontology ◽  
2013 ◽  
Vol 57 (2) ◽  
pp. 417-446 ◽  
Author(s):  
Cecilia M. Larsson ◽  
Christian B. Skovsted ◽  
Glenn A. Brock ◽  
Uwe Balthasar ◽  
Timothy P. Topper ◽  
...  
Keyword(s):  
Shell Structure ◽  
Lower Cambrian ◽  
South Australia ◽  
Stem Group

PALEOENVIRONMENTAL AND TAPHONOMIC IMPLICATIONS FOR LOWER CAMBRIAN PHOSPHATIC HARDGROUNDS FROM SOUTH AUSTRALIA

2020 ◽  
Author(s):  
Sarah M. Jacquet ◽  
◽  
April A. Miller ◽  
Laura Speir ◽  
Tara Selly ◽  
...  
Keyword(s):  
Lower Cambrian ◽  
South Australia

Occurrence of the Enigmatic Bivalved FossilApistoconchain the Lower Cambrian of Southeast Shaanxi, North China Platform

2014 ◽  
Vol 88 (2) ◽  
pp. 359-366 ◽  
Author(s):  
Guoxiang Li ◽  
Zhifei Zhang ◽  
Hong Hua ◽  
Huining Yang
Keyword(s):  
Carbonate Rocks ◽  
Lower Cambrian ◽  
Morphological Analysis ◽  
North China ◽  
Bilateral Symmetry ◽  
Shaanxi Province ◽  
Single Type ◽  
Posterior Teeth ◽  
North China Platform ◽  
Stem Group

The early Cambrian calcareous skeletal fossilApistoconchaConway Morris is characterized by its two valves having posterior teeth and internal umbonal cavities. It has been reported from lower Cambrian Botomian-equivalent carbonate rocks in Australia, Mongolia, and Greenland. Here we report a new occurrence ofApistoconchain the lower Cambrian Xinji Formation of Luonan, southeast Shaanxi Province, North China Platform. Based on material (five ventral and four dorsal valves) from the Xinji Formation,Apistoconchacf.aphelesis systematically described and the taxonomic affinity ofApistoconchais discussed. The shell ofApistoconchapossesses an ‘antero-posterior’ plane of bilateral symmetry, and its two valves apparently articulated in life, although the tooth-like structures and pits show little resemblance to the teeth and sockets, respectively, of bivalved shells of rhynchonelliform brachiopods or pelecypods.Apistoconchacannot be assigned to the crown groups of either brachiopods or mollusks, even though functional morphological analysis indicates thatApistoconchamay be a ‘stem-group brachiopod’. UnlikeApistoconcha, the morphologically similarTianzhushanellaLiu is known only from a single type of valve lacking posterior teeth and pits.Tianzhushanellamay represent either a univalved animal or a bivalved animal, the other valve of which has not yet been identified. Even though bothApistoconchaandTianzhushanellamay represent stem-group brachiopods, they probably correspond to different stages of brachiopod evolution. Thus assignment ofApistoconchaandTianzhushanellato the same family (Tianzhushanellidae) may obscure their phylogenic implications.

The geological context of the Lower Cambrian (Series 2) Emu Bay Shale Lagerstätte and adjacent stratigraphic units, Kangaroo Island, South Australia

2011 ◽  
Vol 58 (3) ◽  
pp. 243-257 ◽  
Author(s):  
J. G. Gehling ◽  
J. B. Jago ◽  
J. R. Paterson ◽  
D. C. García-Bellido ◽  
G. D. Edgecombe
Keyword(s):  
Lower Cambrian ◽  
South Australia ◽  
Geological Context

scholarly journals The new stem-group brachiopod Oymurania from the lower Cambrian of Siberia

2014 ◽  
Author(s):  
Artem Kouchinsky ◽  
Lars Holmer ◽  
Galina Ushatinskaya ◽  
Michael Steiner
Keyword(s):  
Lower Cambrian ◽  
Stem Group

scholarly journals Nektaspid arthropods from the Lower Cambrian Emu Bay Shale Lagerstätte, South Australia, with a reassessment of lamellipedian relationships

Palaeontology ◽  
2010 ◽  
Vol 53 (2) ◽  
pp. 377-402 ◽  
Author(s):  
JOHN R. PATERSON ◽  
GREGORY D. EDGECOMBE ◽  
DIEGO C. GARCÍA-BELLIDO ◽  
JAMES B. JAGO ◽  
JAMES G. GEHLING
Keyword(s):  
Lower Cambrian ◽  
South Australia

scholarly journals A New Leanchoiliid Megacheiran Arthropod from the Lower Cambrian Emu Bay Shale, South Australia

2011 ◽  
Vol 56 (2) ◽  
pp. 385-400 ◽  
Author(s):  
Gregory D. Edgecombe ◽  
Diego C. García-Bellido ◽  
John R. Paterson
Keyword(s):  
Lower Cambrian ◽  
South Australia

Ediacaran scavenging as a prelude to predation

2018 ◽  
Vol 2 (2) ◽  
pp. 213-222 ◽  
Author(s):  
James G. Gehling ◽  
Mary L. Droser
Keyword(s):  
Microbial Mats ◽  
South Australia ◽  
Trace Fossil ◽  
Localized Source ◽  
Oxygen Levels ◽  
Stem Group ◽  
Ediacara Biota ◽  
Ecological Innovation ◽  
Large Predators ◽  
Ancient Ecosystems

Predation is one of the most fundamental ecological and evolutionary drivers in modern and ancient ecosystems. Here, we report the discovery of evidence of the oldest scavenging of shallowly buried bodies of iconic soft-bodied members of the Ediacara Biota by cryptic seafloor mat-burrowing animals that produced the furrow and levee trace fossil, Helminthoidichnites isp. These mat-burrowers were probably omnivorous, stem-group bilaterians that largely grazed on microbial mats but when following mats under thin sands, they actively scavenged buried Dickinsonia, Aspidella, Funisia and other elements of the Ediacara Biota. These traces of opportunistic scavengers of dead animals from the Ediacaran of South Australia represent a fundamental ecological innovation and a possible pathway to the evolution of macrophagous predation in the Cambrian. While the Ediacaran oceans may have had oxygen levels too low to support typical large predators, the Helminthoidichnites maker lived in and grazed on microbial mats, which may have provided a localized source of oxygen.

scholarly journals Ediacaran to lower Cambrian basement in eastern George V Land (Antarctica): Evidence from U Pb dating of gneiss xenoliths and implications for the South Australia- East Antarctica connection

Lithos ◽  
2018 ◽  
Vol 318-319 ◽  
pp. 219-229 ◽  
Author(s):  
Gaëlle Lamarque ◽  
Jérôme Bascou ◽  
René-Pierre Ménot ◽  
Jean-Louis Paquette ◽  
Simon Couzinié ◽  
...  
Keyword(s):  
Lower Cambrian ◽  
South Australia ◽  
East Antarctica ◽  
The South

The taphonomy and affinities of the problematic fossilMyoscolexfrom the Lower Cambrian Emu Bay Shale of South Australia

1997 ◽  
Vol 71 (1) ◽  
pp. 22-32 ◽  
Author(s):  
Derek E. G. Briggs ◽  
Christopher Nedin
Keyword(s):  
Muscle Tissue ◽  
Lower Cambrian ◽  
Soft Tissues ◽  
South Australia ◽  
Variable Number ◽  
Trunk Muscles ◽  
Burgess Shale ◽  
Organic Residues ◽  
Striking Contrast

Most of the specimens ofMyoscolex atelesGlaessner, 1979, the most abundant soft-bodied taxon in the Big Gully fauna from the Lower Cambrian Emu Bay Shale of South Australia, preserveonlythe phosphatized trunk muscles, in striking contrast to the organic residues that characterize other Burgess-Shale-type biotas. This is the oldest phosphatized muscle tissue and the first thus far reported from the Cambrian. The extent of phosphatization implies a source in addition to the animal itself, and this is reflected in high levels of phosphate in the Big Gully sequence compared to other shales. The apparent anomaly posed by the extensive preservation of labile muscle tissue as opposed to the more decay resistant cuticle is explained by the role of bacterial processes in the preservation of soft tissues. New specimens ofMyoscolexreveal a variable number of trunk somites with possible tergites, and flap-like appendages. There is evidence for at least three eyes on the head, and a proboscis may have been present. An annelid affinity is rejected andMyoscolexis reinterpreted as anOpabinia-likeanimal with possible affinities with the arachnomorph arthropods.

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