A new rorringtoniid trilobite from the Ludlow of Arctic Canada

Adrain, Jonathan M.; Chatterton, Brian D. E.

doi:10.1139/e93-141

Cited by 23 publications

(16 citation statements)

References 17 publications

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“…80, fig. 11) from the uppermost Hirnantian/lower Rhuddanian of Meitan, northern Guizhou, China; however, Adrain & Chatterton (1993) and Adrain (2013) assigned Niuchangella to the Scharyiidae and, based on the sub-triangular glabellar outline, laterally displaced L1 and the possibly lower number of thoracic segments (probably eight, not nine as stated by Zhang 1974), we agree with this assignment.…”

Section: Radnoria Carlsisupporting

confidence: 82%

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The oldest brachymetopid trilobite record from the European peri-Gondwana

Pereira¹,

Silva²,

Pires³

et al. 2015

Bull. Geosci.

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Section: Radnoria Carlsisupporting

confidence: 82%

“…Lieberman & Karim (2010) considered Proscharyia to be a separate phylogenetic branch of the Order Aulacopleurida, though directly related to the Scharyiidae and Brachymetopidae, a view previously discussed by Adrain & Chatterton (1993). Zhou & Zhou (2008) considered Radnoria to be a junior synonym of Niuchangella Zhang, 1974.…”

Section: Radnoria Carlsimentioning

confidence: 93%

The oldest brachymetopid trilobite record from the European peri-Gondwana

Pereira¹,

Silva²,

Pires³

et al. 2015

Bull. Geosci.

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“…Discussion of the systematic positions of these three taxa continues (e.g. Adrain & Chatterton 1993;Hammann & Leone 1997;Owens & Fortey 2009) mainly because of the lack of data on their ontogeny.…”

Section: Systematic Aspectsmentioning

confidence: 99%

Biometry and lifestyle of the Ordovician proetide trilobiteCyamella stensioeiOwens, 1979

Popp

Pärnaste

2011

GFF

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Biometric analyses of the trilobite Cyamella stensioei Owens, 1979, from carbonate mud mounds of the Upper Ordovician Boda Limestone of central Sweden, along with a comparison of closely allied rorringtoniid taxa from outside Baltoscandia, reveal important systematic and ecological information on this proetide taxon. Biometric analysis of the cephala of C. stensioei shows a number of instars, reflecting several ontogenetic stages, and a meraspis stage of this taxon is figured for the first time. C. stensioei is exclusively found in mass accumulations in the former, open cavities of the carbonate mud mound and was therefore most likely a cavity-dweller, possibly adapted to this lifestyle through chemosymbiosis. Some of the cavities are interpreted as former seepage conduits. Comparison of C. stensioei with other rorringtoniid trilobites suggests possible ancestors occurring in South China and Sibumasu terranes, determined earlier as Decoroproetus sp. and Cyamella sp., all differing from the genus Paracyamella, which is reassessed here. In wider terms of ancestry, they originate from Baltica or Laurentia, where the first rorringtoniids are known from the middle Darriwilian.

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“…minuta (Nieszkowski), which occurs together with cephala of P. parvus, may prove to belong to this species. Panarchaeogonus phylzacius Owens from the lower Chasmops Shale and Limestone (Owens 1979), or from the Arnestad and Frognerkilen formations, respectively, in the Oslo district (Owen et al 1990) and P. holmi (Warburg) from the Boda Limestone Formation were transferred to the closely related scharyiid Niuchangella W Chang by Adrain & Chatterton (1993, p. 1636. Panarchaeogonus Öpik and Niuchangella both have been recorded from outcrops of the Boda Limestone Formation and also from Upper Ordovician geschiebe at Hulterstad on Öland (Owens 1979, p. 206).…”

Section: Scharyiidaementioning

confidence: 99%

Distribution of the order Proetida (Trilobita) in Baltoscandian Ordovician strata

Pärnaste¹,

Popp²,

Owens³

2009

Estonian J. Earth Sci.

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The trilobite order Proetida forms a minor but important faunal element within the Ordovician strata of Baltoscandia. This review follows the current systematic, taxonomic, and stratigraphical usage and discusses the distribution of these trilobites within the context of the Confacies Belt model. A database of species-level information was derived from numerous publications relating to the Scandinavian and Baltic states and relevant neighbouring regions. Important additional information on stratigraphical occurrences of genera has been derived from glacial erratic boulders (geschiebe) from northern Germany and adjacent areas. The representatives from Baltoscandia of three superfamilies, Bathyuroidea, Aulacopleuroidea, and Proetoidea, are listed. The genus level was chosen as the most practicable to plot on the maps, one showing the time interval for the Kukruse Regional Stage (or Global Stage Slice Sa1), the other that for the Pirgu and Porkuni stages (or stage slices Ka4 and Hi1-Hi2). These intervals each show a diversity peak within the ranges of about 30 genera of Proetida and over 70 species from the Ordovician successions of Baltoscandia. Out of these a total of nine genera cross the Ordovician-Silurian boundary.The regional comparisons from within Baltoscandia show differences in facies dependency of certain genera, with possibly also a latitudinal component. During the late Ordovician the faunal resemblance appears to be closest to the neighbouring palaeocontinent Avalonia, suggesting a faunal exchange between or pathways to both continents from elsewhere. Besides climatic and geographical proximity of palaeocontinents, sea-level changes also have to be considered in explaining the distribution of Proetida in Baltoscandia.

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A new rorringtoniid trilobite from the Ludlow of Arctic Canada

Cited by 23 publications

References 17 publications

The oldest brachymetopid trilobite record from the European peri-Gondwana

The oldest brachymetopid trilobite record from the European peri-Gondwana

Biometry and lifestyle of the Ordovician proetide trilobiteCyamella stensioeiOwens, 1979

Distribution of the order Proetida (Trilobita) in Baltoscandian Ordovician strata

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