Significance of intermediate forms in phyletic reconstruction of ammonites: Early Jurassic Phricodoceras case study

Dommergues, Jean‐Louis; Meister, Christian

doi:10.4202/app.2011.0148

Cited by 2 publications

(1 citation statement)

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“…It thus extends and updates Dommergues and Meister's [35] work and it is based on the same methodology. This composite tree is a cladistic formalization of the phylogenetic relationships among all well-established Pliensbachian ammonite clades, together with a thoroughly revised positioning of individual species within them (see also [32] , [36] – [41] ).…”

Section: Methodsmentioning

confidence: 99%

Deep-Time Phylogenetic Clustering of Extinctions in an Evolutionarily Dynamic Clade (Early Jurassic Ammonites)

et al. 2012

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Conservation biologists and palaeontologists are increasingly investigating the phylogenetic distribution of extinctions and its evolutionary consequences. However, the dearth of palaeontological studies on that subject and the lack of methodological consensus hamper our understanding of that major evolutionary phenomenon. Here we address this issue by (i) reviewing the approaches used to quantify the phylogenetic selectivity of extinctions and extinction risks; (ii) investigating with a high-resolution dataset whether extinctions and survivals were phylogenetically clustered among early Pliensbachian (Early Jurassic) ammonites; (iii) exploring the phylogenetic and temporal maintenance of this signal. We found that ammonite extinctions were significantly clumped phylogenetically, a pattern that prevailed throughout the 6.6 Myr-long early Pliensbachian interval. Such a phylogenetic conservatism did not alter – or may even have promoted – the evolutionary success of this major cephalopod clade. However, the comparison of phylogenetic autocorrelation among studies remains problematic because the notion of phylogenetic conservatism is scale-dependent and the intensity of the signal is sensitive to temporal resolution. We recommend a combined use of Moran's I, Pearson's ϕ and Fritz and Purvis' D statistics because they highlight different facets of the phylogenetic pattern of extinctions and/or survivals.

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Section: Methodsmentioning

confidence: 99%

Deep-Time Phylogenetic Clustering of Extinctions in an Evolutionarily Dynamic Clade (Early Jurassic Ammonites)

et al. 2012

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Early Jurassic (Sinemurian) Ammonoids from the Boulders of the Greek Quarry, Central Crimea

Zaitsev,

Ippolitov,

Гуляев

2023

Stratigrafiâ. Geologičeskaâ korrelâciâ

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The Sinemurian ammonoids from the boulders in the Greek quarry (Salgir River basin, south-east of Simferopol city) are described. The assemblages are represented by Phylloceratidae (Phylloceras, Zetoceras and Partschiceras), Juraphyllitidae (Juraphyllites and Paradasyceras), Schlotheimiidae (Phricodoceras), Arietitidae (Coroniceras, Metophioceras, Arnioceras and Asteroceras), Oxynoticeratidae (Gleviceras), Echioceratidae (Plesechioceras, Orthechioceras, Echioceras and Paltechioceras), Eoderoceratidae (Eoderoceras), Epideroceratidae (Epideroceras) and, questionably, Coeloceratidae (?Tetraspidoceras). A new species Asteroceras dommerguesi sp. nov. is described. A sequence of biostratigraphic units was reconstructed and correlated with known biostratigraphic units (zones, subzones and biohorizons) of the Mediterranean area. The ammonite assemblages were found to be close to those of the northern Tethyan margin (Pontic and Austroalpine subprovinces).

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Significance of intermediate forms in phyletic reconstruction of ammonites: Early Jurassic Phricodoceras case study

Abstract: This paper discusses the phyletic interpretation of the genus

Cited by 2 publications

References 26 publications

Deep-Time Phylogenetic Clustering of Extinctions in an Evolutionarily Dynamic Clade (Early Jurassic Ammonites)

Deep-Time Phylogenetic Clustering of Extinctions in an Evolutionarily Dynamic Clade (Early Jurassic Ammonites)

Early Jurassic (Sinemurian) Ammonoids from the Boulders of the Greek Quarry, Central Crimea

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