Middle Cambrian arthropods from Utah

2008 ◽  
Vol 82 (2) ◽  
pp. 238-254 ◽  
Author(s):  
Derek E. G. Briggs ◽  
Bruce S. Lieberman ◽  
Jonathan R. Hendricks ◽  
Susan L. Halgedahl ◽  
Richard D. Jarrard
Keyword(s):  
New Species ◽  
New Genera ◽  
Burgess Shale ◽  
Separate Species ◽  
Middle Cambrian ◽  
Stem Group ◽  
New Material ◽  
A New Species

The Middle Cambrian Spence Shale Member (Langston Formation) and Wheeler and Marjum Formations of Utah are known to contain a diverse soft-bodied fauna, but important new paleontological material continues to be uncovered from these strata. New specimens of anomalocaridids include the largest and smallest near complete examples yet reported from Utah. New material of stem group arthropods includes two new genera and species of arachnomorphs: Nettapezoura basilika and Dicranocaris guntherorum. Other new arachnomorph material includes a new species of Leanchoilia comparable to L. protogonia Simonetta, 1970; Leanchoilia superlata? Walcott, 1912; Sidneyia Walcott, 1911a; and Mollisonia symmetrica Walcott, 1912. L. protogonia from the Burgess Shale is confirmed as a separate species and is not a composite fossil. The first example of the trilobite Elrathia kingii preserving traces of the appendages is described. In addition, new material of the bivalved arthropods Canadaspis Novozhilov in Orlov, 1960; Branchiocaris Briggs, 1976; Waptia Walcott, 1912; and Isoxys Walcott, 1890 is described.

scholarly journals New records of Burgess Shale-type taxa from the middle Cambrian of Utah

2015 ◽  
Vol 89 (3) ◽  
pp. 411-423 ◽  
Author(s):  
Simon Conway Morris ◽  
Paul A. Selden ◽  
Glade Gunther ◽  
Paul G. Jamison ◽  
Richard A. Robison
Keyword(s):  
New Species ◽  
North America ◽  
Northwest Territories ◽  
Type Species ◽  
New Records ◽  
Western North America ◽  
Burgess Shale ◽  
Middle Cambrian ◽  
Stem Group ◽  
A New Species

AbstractCambrian strata of the Laurentian craton contain numerous examples of Burgess Shale–type faunas. Although displaying a more or less concentric distribution around the cratonal margin, most faunal occurrences are in present-day western North America, extending from the Northwest Territories to California. Nevertheless, the soft-bodied and lightly skeletalized fossils in most of these Lagerstätten are highly sporadic. Here, we extend knowledge of such Middle Cambrian occurrences in Utah with reports of four taxa. An arthropod from the Marjum Formation, Dytikosicula desmatae gen. et sp. nov., is a putative megacheiran. It is most similar to Dicranocaris guntherorum, best known from the younger Wheeler Formation, but differs primarily in the arrangement of pleurae and overall size. Along with a specimen of ?Yohoia sp, a new species of Yohoia, Y. utahana sp. nov., is described. It differs from the type and only known species, Y. tenuis, principally in its larger size and shorter exopods; it is the first description of this genus from outside the Burgess Shale. A new species of a stem-group lophotrochozoan from the Spence Shale, Wiwaxia herka sp. nov., possesses a palisade of dorso-lateral spines that are more robust and numerous than the type species of Wiwaxia, W. corrugata. Another notable taxon is Eldonia ludwigi from the Marjum Formation, which is interpreted as a primitive ambulacrarian (assigned to the cambroernids) and a new specimen of the ?cnidarian Cambrorhytium from the Wheeler Shale is illustrated.

scholarly journals The debated question of asymmetrical rhynchonellids (Brachiopoda, Rhynchonellida): examples from the Late Cretaceous of Western Europe

2020 ◽  
Vol 191 ◽  
pp. 1
Author(s):  
Danièle Gaspard ◽  
Sylvain Charbonnier
Keyword(s):  
New Species ◽  
Late Cretaceous ◽  
Western Europe ◽  
Anterior Margin ◽  
Morphological Diversity ◽  
New Genera ◽  
New Material ◽  
A New Species ◽  
Se France ◽  
Sw France

Many Cretaceous asymmetrical rhynchonellid brachiopods (Brachiopoda, Rhynchonellida) have long been considered as Rhynchonella difformis (Valenciennes in Lamarck, 1819). After a revision, Owen (1962) included the Cenomanian specimens from Europe in Cyclothyris M’Coy, 1844. Later, Manceñido et al. (2002) confirmed this decision and critically mentioned the name of another asymmetrical rhynchonellid genus from Spain, Owenirhynchia Calzada in Calzada and Pocovi, 1980. Specimens with an asymmetrical anterior margin (non particularly ecophenotypical), from the Late Coniacian and the Santonian of Les Corbières (Aude, France) and Basse-Provence (SE France) are here compared to specimens of the original Cenomanian species C. difformis. They are also compared to new material from the Northern Castilian Platform (Coniacian-Santonian, N Spain) and to Rhynchonella globata Arnaud, 1877 (Campanian, Les Charentes, Dordogne, SW France) and Rh. vesicularis Coquand, 1860 (Campanian, Charente, SW France). These observations document the great morphological diversity among all these species and lead us to erect a new species: Cyclothyris grimargina nov. sp. from the type material of Arnaud, and two new genera: Contortithyris nov. gen. including Contortithyris thermae nov. sp., Beaussetithyris nov. gen. including Beaussetithyris asymmetrica nov. sp. All of these brachiopods fundamentally present an asymmetrical state which origin is discussed.

A generic level review of Eupithecia Curtis and some closely related genera based on the Palaearctic, Nearctic and Oriental fauna (Lepidoptera, Geometridae, Larentiinae)

Zootaxa ◽  
2012 ◽  
Vol 3587 (1) ◽  
pp. 46 ◽  
Author(s):  
VLADIMIR G. MIRONOV ◽  
ANTHONY C. GALSWORTHY
Keyword(s):  
New Species ◽  
Species Group ◽  
New Combinations ◽  
New Genera ◽  
Status Change ◽  
Generic Level ◽  
Separate Species ◽  
History Of ◽  
Taxonomic Changes ◽  
A New Species

The history of the genus Eupithecia Curtis is reviewed, and a preliminary redescription of the genus is proposed on the basis of the Palaearctic, Nearctic and Oriental fauna. Several Asian species previously placed in Eupithecia  have been found to be anomalous. These are examined and some are placed in related genera, two of them new (Pareupithecia and Girida). A further group (the ‘subrubescens’ group) is retained within Eupithecia as a separate species group. The genus Eva Vojnits is redescribed. A new species is described in the genus Mesoptila Meyrick. Descriptions are given of all genera involved, and full lists of taxa included within them, with the exception of Eupithecia itself. Selected adults and genitalia are illustrated. Taxonomic changes proposed in this paper include: new genera Pareupithecia, Girida; new species  Mesoptila murcida; new synonymies, Emmesocoma Warren, 1907 of Mesoptila Meyrick, 1891 and Horisme sternecki Prout, 1938 of Chloroclystis chingana Wehrli, 1926; new combinations Mesoptila melanolopha Swinhoe, 1895, Mesoptila unitaeniata Warren, 1906, Mesoptila deviridata Warren, 1907, Mesoptila excita Prout, 1958, Mesoptila festiva Prout, 1916, Eupithecia eurytera Prout, 1938, Eupithecia chingana Wehrli, 1926, Pareupithecia spadix Inoue, 1955, Girida rigida Swinhoe, 1892, Girida sporadica Prout, 1932; reinstated taxon Eupithecia brevifasciaria Leech, 1897; and status change  Girida sporadica Prout, 1932.

The Trilobite Genus Holasaphus Matthew, 1895 in the Middle Cambrian Rocks of Nova Scotia and Eastern Turkey

1972 ◽  
Vol 9 (3) ◽  
pp. 266-279 ◽  
Author(s):  
W. T. Dean
Keyword(s):  
New Species ◽  
Nova Scotia ◽  
Type Species ◽  
Middle Portion ◽  
Middle Cambrian ◽  
Upper Cambrian ◽  
Eastern Turkey ◽  
New Material ◽  
Additional Support ◽  
A New Species

Holasaphus centropyge Matthew, 1895, the type species of the genus, is redescribed using known and new material from the Middle Cambrian of Nova Scotia. A new species, Holasaphus mesopotamicus, described from the Derik–Mardin district of southeastern Turkey, marks the only other known occurrence of the genus. The presence there of Holasaphus and the agnostid Peronopsis in the middle portion of the Sosink Formation suggests that the latter may be no younger than Middle Cambrian and lends additional support to evidence for the probable regional absence of Upper Cambrian strata.

A new helcionelloid mollusk from the middle Cambrian Burgess Shale, Canada

2013 ◽  
Vol 87 (6) ◽  
pp. 1067-1070 ◽  
Author(s):  
Simon Conway Morris ◽  
John S. Peel
Keyword(s):  
British Columbia ◽  
New Species ◽  
Cambrian Explosion ◽  
Burgess Shale ◽  
Middle Cambrian ◽  
Marine Life ◽  
A New Species

Burgess Shale-type faunas provide unique insights into the Cambrian “explosion”. Their degree of representativeness of Cambrian marine life in general is, however, less easy to establish. One line of evidence is to consider only the skeletal component of a Burgess Shale-type fauna and compare that with a typical Cambrian assemblage. This paper describes a new species of helcionelloid mollusk (Totoralia reticulata n. sp.) from the middle Cambrian Burgess Shale of British Columbia. Whilst much rarer than the co-occurring smooth shelled helcionelloid Scenella amii, the strongly costate morphology of Totoralia reinforces comparisons with Cambrian shelly faunas. The extension of the range of Totoralia from Argentina to Canada adds support to the proposed derivation of the Precordillera terrane of Mendoza from Laurentia.

Trilobites of the lower Middle Cambrian Poliella denticulata Biozone (new) of southeastern Nevada

2003 ◽  
Vol 77 (2) ◽  
pp. 331-359 ◽  
Author(s):  
Frederick A. Sundberg ◽  
Linda B. McCollum
Keyword(s):  
New Species ◽  
New Genera ◽  
Middle Cambrian ◽  
Faunal Assemblages ◽  
New Material

Two new genera, Poliellaites and Piochella, and six new species, Eokochaspis? cabinensis, Nyella? plana, Poliellaites gloriosa, Piochella peasleensis, Poliella ovala, and Stephenaspis highlandensis, are described from the Susan Duster Limestone and Log Cabin members, Pioche Shale. Kochaspis Resser, 1935, and Kochaspis liliana (Walcott, 1886) are redescribed based on new material. In addition, several species from the Pioche Shale, that are not addressed in our previous reports are discussed in relationship to existing species and local occurrence. The trilobite diversity of the Poliella denticulata Biozone (new) within the study area is 17 genera and 35 species, occurring in five faunal assemblages.

Occurrence of the eudemersal radiodont Cambroraster in the early Cambrian Chengjiang Lagerstätte and the diversity of hurdiid ecomorphotypes

2020 ◽  
Vol 157 (7) ◽  
pp. 1200-1206 ◽  
Author(s):  
Yu Liu ◽  
Rudy Lerosey-Aubril ◽  
Denis Audo ◽  
Dayou Zhai ◽  
Huijuan Mai ◽  
...  
Keyword(s):  
New Species ◽  
South China ◽  
Early Cambrian ◽  
Burgess Shale ◽  
Stem Group ◽  
Lower Palaeozoic ◽  
Trophic Webs ◽  
Chengjiang Lagerstätte ◽  
A New Species

AbstractRadiodonts are a diverse clade of Lower Palaeozoic stem-group euarthropods that played a key role in the emergence of complex marine trophic webs. The latest addition to the group, Cambroraster falcatus, was recently described from the Wuliuan Burgess Shale, and is characterized by a unique horseshoe-shaped central carapace element. Here we report the discovery of Cambroraster sp. nov. A, a new species from the Cambrian Stage 3 Chengjiang Lagerstätte of South China. The new occurrence of Cambroraster demonstrates that some of the earliest known radiodonts had already evolved a highly derived carapace morphology adapted to an essentially eudemersal life as sediment foragers.

scholarly journals Middle Cambrian trilobites from the Ekspedition Bræ Formation of North Greenland, with a reappraisal of the genusElrathina

2016 ◽  
Vol 91 (2) ◽  
pp. 265-293 ◽  
Author(s):  
Gerd Geyer ◽  
John S. Peel
Keyword(s):  
New Species ◽  
Type Species ◽  
Ontogenetic Development ◽  
Burgess Shale ◽  
Middle Cambrian ◽  
Fossil Assemblage ◽  
Detailed Assessment ◽  
Excellent Preservation ◽  
A New Species ◽  
North Greenland

AbstractThe richly fossiliferous Ekspedition Bræ Formation of North Greenland yields a typical oligospecific fossil assemblage with well-preserved trilobites, helcionelloids, and lingulate brachiopods. The trilobites includeItagnostus subhastatusnew species,Itagnostussp. cf.I.gaspensis(Rasetti, 1948),Elrathina aphroditenew species,Elrathina athenanew species,Elrathina heranew species, andElrathia groenlandicanew species—a fossil assemblage typical of theBathyuriscus-ElrathinaZone as known from the Cordilleran regions of Laurentia. Excellent preservation allows a detailed assessment of the prosopon and elucidates aspects of the ontogenetic development ofElrathinaandElrathia. An evaluation ofElrathinaincludes a redescription of its type species,E.cordillerae(Rominger, 1887), based on the type material, and indicates that most specimens collected from the Burgess Shale and previously dealt with asE.cordilleraerepresent a new species.

Polypleuraspis (Arthropoda, Trilobita) from the middle Cambrian (Miaolingian Series) around Kane Basin (Nunavut and Greenland)

2020 ◽  
Vol 57 (1) ◽  
pp. 16-24
Author(s):  
John S. Peel
Keyword(s):  
British Columbia ◽  
New Species ◽  
North American ◽  
Type Species ◽  
Wood Formation ◽  
Ellesmere Island ◽  
Burgess Shale ◽  
Middle Cambrian ◽  
Shale Formation ◽  
A New Species

Polypleuraspis Poulsen, 1927, originally established on the basis of a single trilobite pygidium from the Cape Wood Formation of Inglefield Land, northwestern Greenland, is redescribed on the basis of material from additional occurrences in the Cape Wood and Telt Bugt formations exposed around Kane Basin in Ellesmere Island (Nunavut) and northern and northwestern Greenland. Polypleuraspis occurs together with Glossopleura Poulsen, 1927 in the Glossopleura walcotti Poulsen, 1927 Biozone of the Delamaran Stage of North American (Laurentian) usage, in middle Cambrian strata (Miaolingian Series) of the Wuliuan Stage. The type species, Polypleuraspis solitaria Poulsen, 1927, is compared with Polypleuraspis insignis Rasetti, 1951 from the Stephen Formation (Burgess Shale Formation) of British Columbia and to a new species from the Telt Bugt Formation of Daugaard-Jensen Land: Polypleuraspis glacialis sp. nov. Polypleuraspis cooperi Robison and Babcock, 2011, from the Spence Shale of Utah of similar age, is assigned to Polypleuraspidella gen. nov.

scholarly journals The stalked filter feeder Siphusauctum lloydguntheri n. sp. from the middle Cambrian (Series 3, Stage 5) Spence Shale of Utah: its biological affinities and taphonomy

2017 ◽  
Vol 91 (5) ◽  
pp. 902-910 ◽  
Author(s):  
Julien Kimmig ◽  
Luke C. Strotz ◽  
Bruce S. Lieberman
Keyword(s):  
New Species ◽  
Digestive Tract ◽  
Burgess Shale ◽  
Filter Feeder ◽  
Middle Cambrian ◽  
Additional Information ◽  
First Occurrence ◽  
Northern Utah ◽  
Filter Feeders ◽  
A New Species

AbstractWe describe a new species of enigmatic stalked filter feeder, Siphusauctum lloydguntheri, from the middle Cambrian (Series 3, Stage 5) Antimony Canyon locality of the Spence Shale of northern Utah. The described specimen is the only one known from the Spence Shale, represents the first occurrence of Siphusauctum outside the Burgess Shale, and is only the second described species from the genus. Siphusauctum lloydguntheri n. sp. differs from S. gregarium O’Brien and Caron, 2012 in the shape of its calyx and the position of the digestive tract. The new species provides some additional information about the possible affinities of enigmatic stalked Cambrian filter feeders, as well as the taphonomic pathways that lead to preservation of Siphusauctum.

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