A new Griesbachian–Dienerian (Induan, Early Triassic) ammonoid fauna from Gujiao, South China

Dai, Xu; Song, Haijun; Brayard, Arnaud; Ware, David

doi:10.1017/jpa.2018.46

Cited by 12 publications

(13 citation statements)

References 75 publications

(186 reference statements)

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“…There are 15 newcomers in the Griesbachian, which had a high BC value corresponding to cosmopolitan distributions, for example, Ophiceras and Wordieoceras . A few endemic genera also exist in the Griesbachian assemblages, for example, Jieshaniceras , which has only been reported from south China to date (Brühwiler et al 2008; Dai et al 2019). These results support previous work and show that the association between geographic range size and survivorship can be removed during mass extinctions, as widespread environmental perturbations simultaneously affect both endemic and cosmopolitan taxa (Payne and Finnegan 2007; Dunhill and Wills 2015).…”

Section: Discussionmentioning

confidence: 99%

Toward an understanding of cosmopolitanism in deep time: a case study of ammonoids from the middle Permian to the Middle Triassic

Dai

Song

2020

Paleobiology

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Cosmopolitanism occurred recurrently during the geologic past, especially after mass extinctions, but the underlying mechanisms remain poorly known. Three theoretical models, not mutually exclusive, can lead to cosmopolitanism: (1) selective extinction in endemic taxa, (2) endemic taxa becoming cosmopolitan after the extinction and (3) an increase in the number of newly originated cosmopolitan taxa after extinction. We analyzed an updated occurrence dataset including 831 middle Permian to Middle Triassic ammonoid genera and used two network methods to distinguish major episodes of ammonoid cosmopolitanism during this time interval. Then, we tested the three proposed models in these case studies. Our results confirm that at least two remarkable cosmopolitanism events occurred after the Permian–Triassic and late Smithian (Early Triassic) extinctions, respectively. Partitioned analyses of survivors and newcomers revealed that the immediate cosmopolitanism event (Griesbachian) after the Permian–Triassic event can be attributed to endemic genera becoming cosmopolitan (model 2) and an increase in the number of newly originated cosmopolitan genera after the extinction (model 3). Late Smithian cosmopolitanism is caused by selective extinction in endemic taxa (model 1) and an increase in the number of newly originated cosmopolitan genera (model 3). We found that the survivors of the Permian–Triassic mass extinction did not show a wider geographic range, suggesting that this mass extinction is nonselective among the biogeographic ranges, while late Smithian survivors exhibit a wide geographic range, indicating selective survivorship among cosmopolitan genera. These successive cosmopolitanism events during severe extinctions are associated with marked environmental upheavals such as rapid climate changes and oceanic anoxic events, suggesting that environmental fluctuations play a significant role in cosmopolitanism.

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Section: Discussionmentioning

confidence: 99%

Toward an understanding of cosmopolitanism in deep time: a case study of ammonoids from the middle Permian to the Middle Triassic

Dai

Song

2020

Paleobiology

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“…brachiopods, bryozoans, gastropods, corals and dasycladacean algae; Dai et al . 2019). This bioclastic limestone‐dominated succession with abundant calcareous algae and corals suggests deposition on a carbonate platform.…”

Section: Geological Settingmentioning

confidence: 99%

“…1D; Dai et al . 2019). Abundant radiolarians have been documented in the cherty limestone and cherts, suggesting a deep basin setting (Feng & Gu 2002).…”

Section: Geological Settingmentioning

confidence: 99%

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A Changhsingian (late Permian) nautiloid assemblage from Gujiao, South China

Miao

Dai

Korn

et al. 2019

Papers in Palaeontology

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A c. 0.30 m thick cherty limestone bed in the Dalong Formation at Gujiao (Guizhou) has yielded a highly diverse Changhsingian nautiloid assemblage. Its age is late Changhsingian, indicated by the co‐occurring ammonoid Pseudotirolites sp. This assemblage is composed of nine species and five taxa in open nomenclature in nine genera, including one new genus and three new species: Neotainoceras zhaoi sp. nov., Nodopleuroceras gujiaoense sp. nov. and Gujiaonautilus longliensis gen. et sp. nov. Sholakoceras is for the first time recorded in South China. Compared with literature data from 52 sites in various regions worldwide, the material described here presents the most diverse Changhsingian nautiloid assemblage. Among the genera of the Gujiao assemblage, Pleuronautilus, Tainoceras and Liroceras are cosmopolitan, while the others are more endemic or genera known so far only from South China.

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“…3, figs. 2a, 2b, holotype Spath, 1930 115 Wordieoceras tompoense Dagys and Ermakova, 1996 Griesbachian (Newcomer) 2 1 2 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 YIG 921/96, holotype Dagys and Ermakova, 1990 116 Jieshaniceras guizhouense (Zakharov and Mu in Mu et al, 2007) Griesbachian (Newcomer) 1 0 2 0 0 0 0 0 0 1 0 0 0 1 0 1 0 1 0 0 0 0 PIMUZ 26780 Brühwiler et al, 2008 117 Mullericeras gujiaoense Dai et al, 2019 Griesbachian (Newcomer) 3 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0 0 0 0 YFMCUG 00018, holotype Dai et al, 2019 118 Pseudovishnuites guidingensis (Zakharov and Mu in Mu et al, 2007) Griesbachian (Newcomer) 2 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 NIGP139992, holotype Mu et al, 2007 119 Gyronitidae gen. indet. sp.…”

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confidence: 99%

Supplemental Material: Morphological selectivity of the Permian-Triassic ammonoid mass extinction

Xu¹,

Song²,

al.³

2021

Preprint

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A new Griesbachian–Dienerian (Induan, Early Triassic) ammonoid fauna from Gujiao, South China

Cited by 12 publications

References 75 publications

Toward an understanding of cosmopolitanism in deep time: a case study of ammonoids from the middle Permian to the Middle Triassic

Toward an understanding of cosmopolitanism in deep time: a case study of ammonoids from the middle Permian to the Middle Triassic

A Changhsingian (late Permian) nautiloid assemblage from Gujiao, South China

Supplemental Material: Morphological selectivity of the Permian-Triassic ammonoid mass extinction

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