Temporal Dynamics of the Geographic Differentiation of Late Devonian<i>Palmatolepis</i>Assemblages in the Prototethys

Girard, Catherine; Phương, Tạ Hòa; Savage, Norman M.; Renaud, Sabrina

doi:10.4202/app.2009.0098

Cited by 7 publications

(5 citation statements)

References 53 publications

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“…Connections between South China and north-west Australia were maintained in the Late Devonian by the occurrence of an extensive, shallow water shelf (Golonka 2007;Metcalfe 2011;Golonka and Gaweda 2012). Previous work on Late Devonian conodonts (Burrett et al 1990;Girard et al 2010) and fish (Long 1993) support a close relationship between the two areas. In addition, Trinajstic and George (2009) (Lelièvre and Derycke 1998, fig.…”

Section: Biogeography and Chondrichthyan Assemblagesmentioning

confidence: 84%

“…An increase in cosmopolitanism is seen in many Late Devonian marine groups, including brachiopods (Copper 1998), ammonoids (House 1973), trilobites (McNamara and Feist 2006), crustaceans (Rode and Lieberman 2005), conodonts (Girard et al 2010) and fish (Ginter and Turner 1999;Burrow et al 2010). This faunal exchange between areas was likely driven by the closure of the Rheic Ocean (Nance et al 2012;Domeier and Torsvik 2014) during the Late Devonian, culminating in an increased proximity of Laurussia and Gondwana (Young 2003;Burrow et al 2010;.…”

Section: Biogeography and Chondrichthyan Assemblagesmentioning

confidence: 99%

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Upper Devonian microvertebrates from the Canning Basin, Western Australia

Roelofs

Playton

Barham

et al. 2015

Acta Geologica Polonica

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A diverse microvertebrate fauna is described from the Virgin Hills and Napier formations, Bugle Gap Limestone Canning Basin, Western Australia. Measured sections at Horse Spring and Casey Falls (Virgin Hills Formation) and South Oscar Range (Napier Formation) comprise proximal to distal slope carbonates ranging in age from the Late Devonian Frasnian to middle Famennian. A total of 18 chondrichthyan taxa are identified based on teeth, including the first record of Thrinacodus tranquillus, Cladoides wildungensis, Protacrodus serra and Lissodus lusavorichi from the Canning Basin. A new species, Diademodus dominicus sp. nov. is also described and provides the first record of this genus outside of Laurussia. In addition, the upper range of Australolepis seddoni has been extended to Late Devonian conodont Zone 11, making it the youngest known occurrence for this species. The Virgin Hills and Napier formations microvertebrate faunas show close affinities to faunas recovered from other areas of Gondwana, including eastern Australia, Iran, Morocco and South China, which is consistent with known conodont and trilobite faunas of the same age.

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Section: Biogeography and Chondrichthyan Assemblagesmentioning

confidence: 84%

Section: Biogeography and Chondrichthyan Assemblagesmentioning

confidence: 99%

Upper Devonian microvertebrates from the Canning Basin, Western Australia

Roelofs

Playton

Barham

et al. 2015

Acta Geologica Polonica

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“…Candidate competitors included Bispathodus , another conodont genus that increased in diversity along the Famennian to represent the dominant component of the conodont fauna towards the end of the period [23], [30], [68]. Its increase in absolute abundance, however, did not fully compensate the decrease in Palmatolepis [32], suggesting that it was not the sole competitor involved.…”

Section: Discussionmentioning

confidence: 99%

“…They especially present the problem to let a large proportion (up to 90% [31] ) of the specimens unidentified and thus not included in the estimation of the morphological variance. The subgenus has been proposed to be closer to what former conodont species might have been, by including a component of geographic and temporal variance that is otherwise split into separate, static units [18] , [32] , [33] . To tackle this problem regarding the basic unit for estimating shape variations, three complementary levels have been considered.…”

Section: Methodsmentioning

confidence: 99%

Disparity Changes in 370 Ma Devonian Fossils: The Signature of Ecological Dynamics?

Girard¹,

Renaud²

2012

PLoS ONE

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Early periods in Earth's history have seen a progressive increase in complexity of the ecosystems, but also dramatic crises decimating the biosphere. Such patterns are usually considered as large-scale changes among supra-specific groups, including morphological novelties, radiation, and extinctions. Nevertheless, in the same time, each species evolved by the way of micro-evolutionary processes, extended over millions of years into the evolution of lineages. How these two evolutionary scales interacted is a challenging issue because this requires bridging a gap between scales of observation and processes. The present study aims at transferring a typical macro-evolutionary approach, namely disparity analysis, to the study of fine-scale evolutionary variations in order to decipher what processes actually drove the dynamics of diversity at a micro-evolutionary level. The Late Frasnian to Late Famennian period was selected because it is punctuated by two major macro-evolutionary crises, as well as a progressive diversification of marine ecosystem. Disparity was estimated through this period on conodonts, tooth-like fossil remains of small eel-like predators that were part of the nektonic fauna. The study was focused on the emblematic genus of the period, Palmatolepis. Strikingly, both crises affected an already impoverished Palmatolepis disparity, increasing risks of random extinction. The major disparity signal rather emerged as a cycle of increase and decrease in disparity during the inter-crises period. The diversification shortly followed the first crisis and might correspond to an opportunistic occupation of empty ecological niche. The subsequent oriented shrinking in the morphospace occupation suggests that the ecological space available to Palmatolepis decreased through time, due to a combination of factors: deteriorating climate, expansion of competitors and predators. Disparity changes of Palmatolepis thus reflect changes in the structure of the ecological space itself, which was prone to evolve during this ancient period where modern ecosystems were progressively shaped.

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“…Conodonts and ammonoids are important fossil groups for international biostratigraphic correlation of the Upper Devonian. Species of the conodont Palmatolepis have been studied in detail (Dzik, ; Girard, Ta, Savage, & Renaud, ; Klapper & Foster, ; Müller, ; Müller & Müller, ; Over, ; Savage, Sardsud, & Buggisch, ). Ta (, ) report Frasnian and Famennian conodonts including Palmatolepis jamieae, Pa. linguiformis , Pa. delicatula , Pa. triangularis and Ancyrodella nodosa from locality S12 (Figure ).…”

Section: Conodont Biostratigraphymentioning

confidence: 99%

The Kellwasser events in the Upper Devonian Frasnian to Famennian transition in the Toc Tat Formation, northern Vietnam

et al. 2018

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Upper Devonian carbonates of the Toc Tat Formation in the Si Phai Pass area of Dong Van District, northern Vietnam were deposited in carbonate platform, slope, and basin environments. These carbonates yield abundant conodonts indicative of the Palmatolepis nasuta, Pa. linguiformis and Pa. triangularis zones, the Frasnian–Famennian stage boundary being identified by the first occurrence of Pa. triangularis. Two positive carbon isotope excursions are recognized, the lower excursion peaking in the interval of the lower to middle Pa. nasuta Zone, whilst the upper excursion peaks just above the local Frasnian–Famennian boundary. Based on the biostratigraphy, these excursions equate to the Lower and Upper Kellwasser events. Locally, tentaculitoid taxa (Nowakia, Styliolina, Homoctenus, and Metastyliolina?) are abundant in the interval of the Pa. nasuta Zone, but show a drastic decline in abundance before the Lower Kellwasser Event, and only two taxa survived into the Famennian.

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Temporal Dynamics of the Geographic Differentiation of Late DevonianPalmatolepisAssemblages in the Prototethys

Abstract: Throughout their history, species had to face environmental variations spatially and temporally. How both levels of variation interact will be of key importance in conditioning their

Cited by 7 publications

References 53 publications

Upper Devonian microvertebrates from the Canning Basin, Western Australia

Upper Devonian microvertebrates from the Canning Basin, Western Australia

Disparity Changes in 370 Ma Devonian Fossils: The Signature of Ecological Dynamics?

The Kellwasser events in the Upper Devonian Frasnian to Famennian transition in the Toc Tat Formation, northern Vietnam

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