Phacopid trilobites in post-Taghanic Givetian through Frasnian cephalopod limestones, Montagne Noire (France) and related areas (Thuringia, Morocco)

Feist, Raimund; Klapper, Gilbert

doi:10.3140/bull.geosci.1834

Cited by 4 publications

(4 citation statements)

References 27 publications

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“…In the Frasnian, morphological disparity remained low. This stage has long been thought to be poorly diversified, despite Feist & Klapper (2022) proposing four new phacopid genera. Nevertheless, this was the least populated period in phacopid history.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, in the late Givetian all phacopids had large eyes. Nevertheless, reduced‐eyed trilobites did survive these environmental changes in other families such as Tropidocoryphidae (Feist 2003). Abiotic causes were not the only possible explanations for the Middle Devonian morphological variations: increasing predation at that time may have reshaped the phacopid morphospace (Brett & Walker 2002; Bault et al .…”

Section: Discussionmentioning

confidence: 99%

“…The classification used for this dataset follows Jell & Adrain (2002). Updates since this publication were taken into account, such as the replacement of Cultrops Struve, 1995 with Struvephacops (Ghobadi Pour, 2015) as well as the description of new genera: Morocops (Basse, 2006), Enigmapyge (Feist et al ., 2016), Magreanops (Van Viersen & Vanherle, 2018), and Feistops (Crônier et al ., 2020), Acutiphacops Feist & Klapper, 2022, Cronierella Feist & Klapper, 2022, Girardina Feist & Klapper, 2022, and Occitanella Feist & Klapper, 2022 (Feist & Klapper, 2022). The Late Devonian Phacops Emmrich, 1839 being significantly different from older specimens (Crônier et al .…”

Section: Methodsmentioning

confidence: 99%

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Rise and fall of the phacopids: the morphological history of a successful trilobite family

Bault,

Crônier,

Monnet

et al. 2023

Palaeontology

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Phacopidae were a successful family of the Silurian–Devonian period. Although their diversity trends are well identified, their shape evolution is unknown; their morphology often considered to be conservative. We have quantified these morphologies using geometric morphometrics (landmarks) and investigated their evolution using morphological disparity indices. Results identified morphological variations between the genera, and through time. Phacopids differ from each other by the position of the facial suture linked to the size of the visual complex, the shape of the genal angle and the elongation of both cephalon and pygidium. The morphological disparity of cephala was high from the Silurian, contrary to that of pygidia. Subsequently, the morphological disparity increased in the Early Devonian with the development of narrow cephala and triangular pygidia. Morphological disparity was greater in the Emsian for both cephala and pygidia, more than 50 myr after the origination of phacopids. It constituted a perfect example illustrating that a peak of biodiversity does not necessarily happen in the early history of a clade. Subsequently, a strong decrease of morphological disparity occurred in the Middle Devonian, in conjunction with sea‐level changes and anoxic events. Taxonomic richness and morphological disparity declined strongly in the Givetian, in a non‐random extinction affecting particularly blind genera. The morphological disparity remained low in the Frasnian despite progressive eye reduction influenced by environmental changes. An extensive recovery occurred in the Famennian with an important increase of both taxonomic and morphological diversity. The Hangenberg event caused the final extinction of phacopids.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Rise and fall of the phacopids: the morphological history of a successful trilobite family

Bault,

Crônier,

Monnet

et al. 2023

Palaeontology

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“…The regular bedding is highlighted by horizontal clay seams and stylolite sutures. Macroscopic skeletal remains include mainly echinoderms, cephalopods (House and Chlupač 1987;House 1996), and trilobites (Feist 2003), while microscopic constituents are dominated by styliolinids, nowakiids and benthic ostracods.…”

Section: Geological Settingmentioning

confidence: 99%

Conodont stratigraphy and biodiversity of the Middle Devonian Kačàk Episode in the Pic de Bissous (Montagne Noire, S-France)

Narkiewicz,

Narkiewicz

2024

Preprint

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Pic de Bissous belongs to classic sections of the latest Eifelian Kačàk Episode (KE) interval, uniquely developed in hemipelagic carbonate facies. The present conodont study is based on dense sampling of the section, yielding rich and diverse assemblages dominated by Polygnathus. The position of the lower and upper KE boundaries is here documented within the late Eifelian kockelianus Zone and at the base of the lowermost Givetian hemiansatus Zone, respectively. Both boundaries are marked by an increase of P1 elements diversity, the phenomenon reported also from other palaeogeographic setting, and accompanied by an appearance of several new taxa. This suggests a global two-step conodont biodiversity rise around the KE interval, presumably caused by the eustatic If and earliest Givetian sealevel rise, respectively. These events were accompanied by increased juvenile conodont mortality probably due to some local/regional adverse conditions of either abiotic or biotic nature.

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Late Devonian (Famennian) phacopid trilobites from western Xinjiang, Northwest China

Crônier

Waters

2022

Palaeobio Palaeoenv

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Phacopid trilobites in post-Taghanic Givetian through Frasnian cephalopod limestones, Montagne Noire (France) and related areas (Thuringia, Morocco)

Cited by 4 publications

References 27 publications

Rise and fall of the phacopids: the morphological history of a successful trilobite family

Rise and fall of the phacopids: the morphological history of a successful trilobite family

Conodont stratigraphy and biodiversity of the Middle Devonian Kačàk Episode in the Pic de Bissous (Montagne Noire, S-France)

Late Devonian (Famennian) phacopid trilobites from western Xinjiang, Northwest China

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