Morphological and ontogenetic criteria for defining a trilobite species: The example of Siluro-Devonian Phacopidae

Crônier, Catherine; Bignon, Arnaud; François, Angela

doi:10.1016/j.crpv.2010.10.003

Cited by 27 publications

(26 citation statements)

References 34 publications

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“…36previously proposed for some of the trilobites included in this study, notably Flexicalymene(Chatterton and Speyer, 1989;Crônier et al, 2011). Three clades, the Deiphoninae, Homalonotidae, and Tetralichinae, trilobites, have been hypothesized to have had a planktic-…”

mentioning

confidence: 85%

Dispersal in the Ordovician: Speciation patterns and paleobiogeographic analyses of brachiopods and trilobites

Lam

Stigall

Matzke

2018

Palaeogeography, Palaeoclimatology, Palaeoecology

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The Middle to Late Ordovician was a time of profound biotic diversification, paleoecological change, and major climate shifts. Yet studies examining speciation mechanisms and drivers of dispersal are lacking. In this study, we use Bayesian phylogenetics and maximum likelihood analyses in the R package BioGeoBEARS to reanalyze ten published data matrices of brachiopods and trilobites and produce time-calibrated species-level phylogenetic hypotheses with estimated biogeographic histories. Recovered speciation and biogeographic patterns were examined within four time slices to test for changes in speciation type across major tectonic and paleoclimatic events. Statistical model comparison showed that biogeographic models that ACCEPTED MANUSCRIPTA C C E P T E D M A N U S C R I P T 2 incorporate long-distance founder-event speciation best fit the data for most clades, which indicates that this speciation type, along with vicariance and traditional dispersal, were important for Paleozoic benthic invertebrates. Speciation by dispersal was common throughout the study interval, but notably elevated during times of climate change. Vicariance events occurred synchronously among brachiopod and trilobite lineages, indicating that tectonic, climate, and ocean processes affected benthic and planktotrophic larvae similarly. Middle Ordovician interoceanic dispersal in trilobite lineages was influenced by surface currents along with volcanic island arcs acting as "stepping stones" between areas, indicating most trilobite species may have had a planktic protaspid stage. These factors also influenced brachiopod dispersal across oceanic basins among Laurentia, Avalonia, and Baltica. These results indicate that gyre spin-up and intensification of surface currents were important dispersal mechanisms during this time. Within Laurentia, surface currents, hurricane tracks, and upwelling zones controlled dispersal among basins. Increased speciation during the Middle Ordovician provides support for climatic facilitators for diversification during the Great Ordovician Biodiversification Event. Similarly, increased speciation in Laurentian brachiopod lineages during the Hirnantian indicates that some taxa experienced speciation in relation to major climate changes. Overall, this study demonstrates the substantial power and potential for likelihood-based methods for elucidating biotic patterns during the history of life.

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confidence: 85%

Dispersal in the Ordovician: Speciation patterns and paleobiogeographic analyses of brachiopods and trilobites

Lam

Stigall

Matzke

2018

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…The ontogenetic development of the phacopid trilobites is becoming better known (Crônier et al . , , ; Crônier and Clarkson ; Crônier and Fortey ; Crônier , ). This ontogenetic development that is a process of spatial and temporal arrangement that includes all changes leading to an adult phenotype is described qualitatively or quantitatively by two main parameters, that is, size and shape.…”

Section: Development and Constraints Of Developmentmentioning

confidence: 99%

Morphological disparity and developmental patterning: contribution of phacopid trilobites

Crônier

2013

Palaeontology

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In trilobites as in many others extinct organisms, our understanding of the mechanisms of evolution is based on morphological and ontogenetic features. Data from ontogenetic development are essential to provide an insight into the origins of evolutionary changes. In phacopid trilobites, detailed studies of ontogenetic series have been achieved using quantitative methods. A comparison of ontogenetic trajectories of closely related species has been conducted to understand how the both morphological disparity and developmental patterning of different ontogenetic stages were structured and to determine how the environmental or developmental con-straints influenced morphological changes in trilobites. Study of such morphological disparity in developmental evolution requires knowledge of morphological features and timing and rate of development among closely related species. At a macroevolutionary scale, such quantitative studies should allow us (1) to determine the impact of individual ontogenies on morphological diversification and (2) to identify the evolutionary patterns in Phacopidae during 100 Ma of existence.

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“…Morphological terminology generally follows that of Chlupáč (1977), and Crônier et al (2011): most terms are also illustrated in these works. …”

Section: Methodsmentioning

confidence: 99%

An unusual occurrence of Pedinopariops (Trilobita: Phacopidae) within siliciclastic facies in the Devonian of Awaynat Wanin, Libya

McKellar¹,

Chatterton²,

Meinhold³

et al. 2011

Bull. Geosci.

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A new phacopid trilobite is described from the Givetian sequence of the Awaynat Wanin Group in the southern Ghadamis Basin, Libya. The specimen displays most of the eye and sculpture features necessary for a determination and can be restricted to Pedinopariops (Hypsipariops) Struve, 1982. The new specimen does not belong to any taxon known so far and hence is considered to be a new species. The specimen remains in open nomenclature and is assigned to Pedinopariops (Hypsipariops) sp. nov. A. This is the first Devonian trilobite described from Libya, and represents an unusual occurrence of Phacopidae in a relatively coarse siliciclastic facies.•

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Morphological and ontogenetic criteria for defining a trilobite species: The example of Siluro-Devonian Phacopidae

Cited by 27 publications

References 34 publications

Dispersal in the Ordovician: Speciation patterns and paleobiogeographic analyses of brachiopods and trilobites

Dispersal in the Ordovician: Speciation patterns and paleobiogeographic analyses of brachiopods and trilobites

Morphological disparity and developmental patterning: contribution of phacopid trilobites

An unusual occurrence of Pedinopariops (Trilobita: Phacopidae) within siliciclastic facies in the Devonian of Awaynat Wanin, Libya

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