Ordovician trilobites from the Romaine and Mingan formations (Ibexian-late Whiterockian), Mingan Islands, Quebec

Shaw, Frederick; Bolton, T E

doi:10.1666/10-062.1

Cited by 8 publications

(4 citation statements)

References 54 publications

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“…The palpebral lobes are smaller than in the new species, and the maximum glabella constriction more posterior. Shaw (1968) and Shaw & Bolton (2011) revised Bumastus limbatus Raymond, 1910b, from the Chazy Group type area and the Mingan Islands, Quebec, respectively, and reassigned this species to Failleana (Shaw & Bolton 2011). This species has a much less 'waisted' glabella and longer pygidium (sag.)…”

Section: D Imentioning

confidence: 99%

Late Ordovician trilobites from the Taimyr Peninsula, Arctic Russia

Ebbestad

Fortey

2019

Journal of Systematic Palaeontology

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Ordovician trilobites from the important sequences of the Taimyr Peninsula, Arctic Russia have been poorly studied since the work by Balashova (1959, 1960). Newly collected and well-preserved specimens from Late Ordovician sections, along with the original collections of Balashova, form the basis of a reappraisal of 56 Upper Ordovician (Sandbian-Katian) trilobites. New species include Bronteopsis tenuirhachis, Dionide trigintasegmentata, Failleana superba, Pararemopleurides ornatissimus, Raymondella plastron, Robergia subtilis and R. nikolaiseni. Probable new species include: Stenopareia sp. aff. S. glaber, and Stygina sp. aff. S. latifrons. A new subgenus Bilobaspis of the monorakine genus Evenkaspis, and a new species, Evenkaspis (Bilobaspis) mirabilis, are proposed. Thoracic segments and pygidium are correctly associated for the first time with cephala of the hitherto poorly understood Taimyraspis. The genera Effnaspis and Yumenaspis are likely junior synonyms of Taimyraspis. A placement within the Ityophoridae is suggested for Taimyraspis, together with the closely related genera Ityophorus and Frognaspis. Comparison of Goldillaenoides taimyricus with Failleana suggests that these are also closely related. A provisional placement of the former in the Styginidae is adopted. Bronteopsis nannus Balashova could be a juvenile B. tenuirhachis, and is regarded as a nomen dubium. The genus Ceratevenkaspis dominates among the monorakines on Taimyr, while Monorakos itself has not been collected. Robergia nikolaiseni has a narrow cranidial border, which is also present in the type species of Robergia. Two biofacies are identified in the current collections. The first, the raphiophorid association, is widespread around low latitude Ordovician palaeocontinents, identifying marginal shelf sites; the association is not critical in defining palaeocontinents themselves. Inner shelf faunas of the monorakine-cheirurid-illaenid association have taxa that comprise a distinctive group with a strong link between Taimyr and the Ordovician Siberian craton. The trilobites described herein support reconstructions showing Taimyr peripheral to the Siberian craton during the Ordovician.

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Section: D Imentioning

confidence: 99%

Late Ordovician trilobites from the Taimyr Peninsula, Arctic Russia

Ebbestad

Fortey

2019

Journal of Systematic Palaeontology

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“…The phylogenetic analysis has been applied by Amati and Westrop (2004) to systematically revise the relationships between Illaenus , Nanillaenus , and Thaleops . The result indicates that the species of Illaenus are a paraphyletic group and require major revision, while the species of Nanillaenus and Thaleops form a monophyletic group, so Nanillaenus is synonymized with Thaleops , all of which has also been followed by Shaw and Bolton (2011) and Carlucci and Westrop (2015). Previously described Chinese illaenids bearing strongly abaxially protruded palpebral area and short (sag.)…”

Section: Systematic Paleontologymentioning

confidence: 99%

Darriwilian (Middle Ordovician) new trilobites from the Upper Yangtze Region, South China, and their macroevolutionary and paleobiogeographic implications

et al. 2021

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Two new genera and six new species of trilobites are systematically documented herein: Sinagnostus mirabilis new genus new species, Yanpingia punctata n. gen. n. sp., Illaenus taoyuanensis n. sp., Panderia striolatus n. sp., Nileus yichongqiaoensis n. sp., and Paratiresias peculiaris n. sp. The materials were collected from the Darriwilian (late Middle Ordovician) strata in the Upper Yangtze Region, South China. Also provided is an emended diagnosis of the genus Paratiresias based on the new species Paratiresias peculiaris, which is the oldest known species of this genus with an extremely narrow (sag. and exsag.) preglabellar field. Those Chinese species previously referred to Nanillaenus are reassigned to Illaenus sensu lato. These trilobites add new data for the Darriwilian trilobite macroevolution and show highly endemic to South China and the faunal exchanges between South China and Tarim, Kazakhstan, Alborz, as well as Sibumasu and North China. UUID: http://zoobank.org/ec3be9be-b003-4367-910d-7a0ac4edc982

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“…However, we consider that Opsypharus and Failleana are distinct genera, and we restrict Failleana to the species (all Ordovician) listed by Chatterton and Ludvigsen (1976, p. 38) as well as F . limbata (Raymond, 1910) of Shaw and Bolton (2011, p. 433, fig. 11.10–11.18, 11.23) from the Mingan Formation of Quebec, F. memorabilis (Reed, 1906) from the lower Balclatchie Group of Scotland (see Morris and Tripp, 1986, p. 165, pl.…”

Section: Systematic Paleontologymentioning

confidence: 99%

Trilobites of the suborder Illaenina from the Silurian of north Queensland, Australia

Holloway

Lane

2016

J. Paleontol.

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The trilobite fauna of the middle Silurian (Telychian to possibly earliest Sheinwoodian) Tomcat Creek limestone in the Broken River Province of north Queensland is dominated by the suborder Illaenina, including illaenimorphs (Illaeninae and Bumastinae) and members of the Scutelluidae. Scutelluidae are most diverse, with eight genera, of whichDolabrapex,Iotoryx,Perizostra, andQuintoniaare new.Perizostrais the first scutelluid with a cephalon that may be described as of phacomorph appearance. Illaenimorphs are represented by three genera, includingOpsypharus, which is regarded as a senior synonym ofParacybantyxbut distinct fromFailleanawith which it has been placed in synonymy by some authors. Thirteen species are new:Cybantyx?ergodes,Opsypharus pandanensis,Australoscutellum talenti,Dolabrapex acomus,Illaenoscutellum psephos,Iotoryx clarksoni,Japonoscutellum mawsonae,J. drakton,J. fractum,Kosovopeltis avita,Perizostra campbelli,Quintonia arata, andQ. pavo. A species ofStenopariais placed in open nomenclature. The species ofAustraloscutellum,Illaenoscutellum, and possiblyKosovopeltisare the oldest known representatives of those genera. These genera andJaponoscutellumare also common in faunas from limestones of Wenlock to Ludlow age in central western New South Wales, reflecting the similarity in lithofacies. The monotypic Late Ordovician genusCraigheadia, which has been regarded as a scutelluid, belongs to the Lichidae and is probably a junior synonym ofLeiolichas.

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Ordovician trilobites from the Romaine and Mingan formations (Ibexian-late Whiterockian), Mingan Islands, Quebec

Cited by 8 publications

References 54 publications

Late Ordovician trilobites from the Taimyr Peninsula, Arctic Russia

Late Ordovician trilobites from the Taimyr Peninsula, Arctic Russia

Darriwilian (Middle Ordovician) new trilobites from the Upper Yangtze Region, South China, and their macroevolutionary and paleobiogeographic implications

Trilobites of the suborder Illaenina from the Silurian of north Queensland, Australia

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