A Quantitative Analysis of Extinctions at the Mesozoic-Cenozoic Boundary

Alekseyev, A. S.

doi:10.1080/00206818409466625

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…410 Ma history, hexapods have evolved morphologically to adapt in a continuously changing world, thereby resulting in a unique mega-biodiversity 1 . Age-old questions 2 – 4 about insects’ macroevolution nowadays receive renewed interest thanks to the remarkable recent improvements in data and methods that allow incorporating full data, phylogenomic trees besides fossil record 5 – 9 . Also significant advances in knowledge on fossil entomofaunas took place during the last 15 years, due to discoveries and studies of several rich sites with exceptional preservation, as well to changes in taxonomy and dating of fossil deposits, rendering useful updates of the previous works.…”

Section: Introductionmentioning

confidence: 99%

“…The insect evolutionary history remains mainly analyzed on the basis of the documented families and orders, ignoring two inherent weaknesses 2 – 15 : the extensions and definitions of the fossil and recent families vary frequently depending on the authors, and the monophyly of fossil groups of high rank is difficult to establish (e.g., the ‘Grylloblattodea’, ‘Protorthoptera’, Meganisoptera, etc.) 16 , 17 (for discussion see 18 , Supporting Information).…”

Section: Introductionmentioning

confidence: 99%

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Diversification of insects since the Devonian: a new approach based on morphological disparity of mouthparts

Nel

Bertrand

Nel

2018

Sci Rep

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The majority of the analyses of the evolutionary history of the megadiverse class Insecta are based on the documented taxonomic palaeobiodiversity. A different approach, poorly investigated, is to focus on morphological disparity, linked to changes in the organisms’ functioning. Here we establish a hierarchy of the great geological epochs based on a new method using Wagner parsimony and a ‘presence/absence of a morphological type of mouthpart of Hexapoda’ dataset. We showed the absence of major rupture in the evolution of the mouthparts, but six epochs during which numerous innovations and few extinctions happened, i.e., Late Carboniferous, Middle and Late Triassic, ‘Callovian-Oxfordian’, ‘Early’ Cretaceous, and ‘Albian-Cenomanian’. The three crises Permian-Triassic, Triassic-Jurassic, and Cretaceous-Cenozoic had no strong, visible impact on mouthparts types. We particularly emphasize the origination of mouthparts linked to nectarivory during the Cretaceous Terrestrial Revolution. We also underline the origination of mouthparts linked to phytophagy during the Middle and the Late Triassic, correlated to the diversification of the gymnosperms, especially in relation to the complex ‘flowers’ producing nectar of the Bennettitales and Gnetales.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diversification of insects since the Devonian: a new approach based on morphological disparity of mouthparts

Nel

Bertrand

Nel

2018

Sci Rep

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Background and Mass Extinctions: The Alternation of Macroevolutionary Regimes

Jablonski

1986

Science

480

354

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Comparison of evolutionary patterns among Late Cretaceous marine bivalves and gastropods during times of normal, background levels of extinction and during the end-Cretaceous mass extinction indicates that mass extinctions are neither an intensification of background patterns nor an entirely random culling of the biota. During background times, traits such as planktotrophic larval development, broad geographic range of constituent species, and high species richness enhanced survivorship of species and genera. In contrast, during the, end-Cretaceous and other mass extinctions these factors were ineffectual, but broad geographic deployment of an entire lineage, regardless of the ranges of its constituent species, enhanced survivorship. Large-scale evolutionary patterns are evidently shaped by the alternation of these two macroevolutionary regimes, with rare but important mass extinctions driving shifts in the composition of the biota that have little relation to success during the background regime. Lineages or adaptations can be lost during mass extinctions for reasons unrelated to their survival values for organisms or species during background times, and long-term success would require the chance occurrence within a single lineage of sets of traits conducive to survivorship under both regimes.

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A Quantitative Analysis of Extinctions at the Mesozoic-Cenozoic Boundary

Cited by 2 publications

References 8 publications

Diversification of insects since the Devonian: a new approach based on morphological disparity of mouthparts

Diversification of insects since the Devonian: a new approach based on morphological disparity of mouthparts

Background and Mass Extinctions: The Alternation of Macroevolutionary Regimes

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