Selection of the conodont Idiognathodus simulator (Ellison) as the event marker for the base of the global Gzhelian Stage (Upper Pennsylvanian, Carboniferous)

Villa, Elisa; Алексеев, А. С.; Barrick, James E.; Boardman, Darwin R.; Djenchuraeva, A. V.; Fohrer, Beate; Forke, Holger; Goreva, N.V.; Heckel, Philip H.; Исакова, Т. Н.; Kossovaya, Olga L.; Lambert, Lance L.; Martínez-Chacón, María Luisa; Méndez, Carlos A.; Nemyrovska, Tamara I.; Remizova, Svetlana; Samankassou, Elias; Posada, Luis C. Sánchez de; Ueno, Katsumi; Wahlman, Gregory P.; Work, David M.

doi:10.1016/j.palwor.2009.04.002

Cited by 13 publications

(6 citation statements)

References 6 publications

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“…This conodont assemblage is typical of the base of the I. simulator Zone. The first appearance of its index species is recommended to be regarded as the base of the global Gzhelian Stage of the Upper Pennsylvanian (Heckel et al 2008;Villa et al 2009). Thus, the deposition of this layer was coeval with the Kosherovo Formation of the Rusavkino and Gzhel sections in central Russia (Alekseev et al 2009), which also yielded Campyloprion specimens described by earlier authors (Karpinsky 1924a;Obruchev 1964;Itano & Lucas 2018).…”

Section: Geographical and Geological Settingsmentioning

confidence: 84%

Tooth whorl structure, growth and function in a helicoprionid chondrichthyan Karpinskiprion (nom. nov.) (Eugeneodontiformes) with a revision of the family composition

Lebedev

Itano

Johanson

et al. 2022

Earth and Environmental Science Transactions of the Royal Society of Edinburgh

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Restudy of Campyloprion annectans Eastman, 1902 from North America demonstrated that neither specimen included is diagnostic at the species level; thus, the species name is a nomen dubium. Since this species was designated as the type species of the genus, this requires suppression of the generic name also. Another species earlier assigned to Campyloprion, Campyloprion ivanovi Karpinsky, 1924 is used as a type for a newly established genus Karpinskiprion Lebedev et Itano gen. nov. The composition of the family Helicoprionidae Karpinsky, 1911 is reviewed, and a new family Helicampodontidae Itano et Lebedev fam. nov. is erected. A new specimen of Karpinskiprion ivanovi (Karpinsky, 1924) recently discovered in the Volgograd Region of Russia is the most complete Karpinskiprion specimen ever found. It unambiguously demonstrates the coiled nature of these tooth whorls and presents information on their developmental stages. During organogeny, cutting blades of the crown became reshaped, and basal spurs progressively elongated, forming a grater. Whorl growth occurred by addition of new crowns to the earlier mineralised base followed by later spur growth. In contrast to consistently uniform cutting blades, spurs are often malformed and bear traces of growth interruption. Both sides of the outer coil of the tooth whorl bear lifetime wear facets. The youngest (lingual) crowns are as yet unaffected by wear. The best-preserved facets show parallel radially directed scratch marks. The upper jaw dentition of Karpinskiprion is unknown, but we suggest that the faceted areas resulted from interaction with the antagonistic dental structures here. Three possible hypotheses for this interaction are suggested: (a) two opposing whorls acted as scissor blades, moving alternately from one side to another; (b) the lower tooth whorl fitted between paired parasymphyseal tooth whorls of the opposing jaw; or (c) the lower tooth whorl fitted into a dental pavement in the upper jaw.

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Section: Geographical and Geological Settingsmentioning

confidence: 84%

Tooth whorl structure, growth and function in a helicoprionid chondrichthyan Karpinskiprion (nom. nov.) (Eugeneodontiformes) with a revision of the family composition

Lebedev

Itano

Johanson

et al. 2022

Earth and Environmental Science Transactions of the Royal Society of Edinburgh

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“…The first appearance datum (FAD) of I. simulator has been selected as the biostratigraphic index for the base of the Gzhelian (Villa et al . ), although a GSSP has not yet been chosen. The appearance of several additional species with I. simulator in the Naqing and Narao sections offer other potential means by which the base of the Gzhelian could be recognized.…”

Section: Conodont Successionmentioning

confidence: 99%

“…Since then, I. simulator has received attention as the potential event marker for the base of the global Gzhelian Stage because of its more global distribution as compared with endemic fusulinid species (Villa et al . ; Boardman et al . ).…”

mentioning

confidence: 96%

Conodont faunas across the Kasimovian–Gzhelian boundary (Late Pennsylvanian) in South China and implications for the selection of the stratotype for the base of the global Gzhelian Stage

Barrick

Hogancamp

et al. 2020

Papers in Palaeontology

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The upper Pennsylvanian Naqing and Narao carbonate successions were deposited in intra-platform slope-to-basinal settings across the Kasimovian-Gzhelian boundary in Guizhou, South China. Conodont faunas consist of a mixture of the endemic taxa of the Idiognathodus luodianensis group and cosmopolitan species of the I. simulator group. The I. luodianensis group includes the new species I. fengtingensis, I. luodianensis, I. naqingensis and I. naraoensis. On platform landmark analysis the species of the I. luodianensis group differ in morphological features from co-occurring species of the I. simulator group. Both groups display similar increasing asymmetry in P 1 element pairs across the Kasimovian-Gzhelian boundary, as recognized on the basis of the first occurrence of I. simulator. Many Kasimovian Idiognathodus species disappear and several Gzhelian species first appear with I. simulator, including two new species of Streptognathodus: S. nemyrovskae and S. zhihaoi. Just below the base of the Gzhelian, carbonate d 13 C falls from 4& to 2& in both sections. The combination of an abrupt faunal turnover immediately above the prominent negative d 13 C excursion might represent an oceanic event in South China, perhaps recognizable on a global scale. One of these two South China sections may be the best location to place the GSSP for the base of the Gzhelian Stage.

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“…After fixing the base of the Gzhelian Stage by using the first appearance datum of the conodont Idiognathodus simulator (Ellison, 1941) s.s. in its potential lineage Idiognathodus eudoraensis -I. simulator (Heckel et al, 2008;Villa et al, 2009), the task group is directing research toward selecting a section for the GSSP.…”

Section: Kasimovian-gzhelian Boundarymentioning

confidence: 99%

“…For that boundary, the use of the FAD of the conodont Idiognathodus heckeli Rosscoe & Barrick, 2013 shows great potential and is being tested prior to final approval. The first appearance datum (FAD) of a conodont has been formally selected for defining the base of the Gzhelian Stage (Heckel et al, 2008;Villa et al, 2009) and the search for a suitable section for the GSSP continued.…”

Section: Introductionmentioning

confidence: 99%

Paleozoic radiolarian biostratigraphy

et al. 2017

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Selection of the conodont Idiognathodus simulator (Ellison) as the event marker for the base of the global Gzhelian Stage (Upper Pennsylvanian, Carboniferous)

Cited by 13 publications

References 6 publications

Tooth whorl structure, growth and function in a helicoprionid chondrichthyan Karpinskiprion (nom. nov.) (Eugeneodontiformes) with a revision of the family composition

Tooth whorl structure, growth and function in a helicoprionid chondrichthyan Karpinskiprion (nom. nov.) (Eugeneodontiformes) with a revision of the family composition

Conodont faunas across the Kasimovian–Gzhelian boundary (Late Pennsylvanian) in South China and implications for the selection of the stratotype for the base of the global Gzhelian Stage

Paleozoic radiolarian biostratigraphy

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