Discussion on ‘A high-precision U–Pb age constraint on the Rhynie Chert Konservat-Lagerstätte: time scale and other implications’

Mark, Darren F.; Rice, Clive Maitland; Trewin, Nigel H.

doi:10.1144/jgs2011-110

Cited by 41 publications

(19 citation statements)

References 18 publications

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“…R. Soc. B 285: 20172631 have been dated to the early Pragian to early Emsian [70] and the andesite beneath the Rhynie Chert has been dated to 411 Ma [70,71], though the temporal relationship between the andesite and the chert is subject to controversy [72,73]. Here, Rhyniognatha hirsti is considered to be approximately 407 Myr in age.…”

Section: Sedimentological and Palaeontological Datamentioning

confidence: 99%

PhanerozoicpO₂and the early evolution of terrestrial animals

et al. 2018

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Concurrent gaps in the Late Devonian/Mississippian fossil records of insects and tetrapods (i.e. Romer's Gap) have been attributed to physiological suppression by low atmospheric O Here, updated stable isotope inputs inform a reconstruction of Phanerozoic oxygen levels that contradicts the low oxygen hypothesis (and contradicts the purported role of oxygen in the evolution of gigantic insects during the late Palaeozoic), but reconciles isotope-based calculations with other proxies, like charcoal. Furthermore, statistical analysis demonstrates that the gap between the first Devonian insect and earliest diverse insect assemblages of the Pennsylvanian (Bashkirian Stage) requires no special explanation if insects were neither diverse nor abundant prior to the evolution of wings. Rather than tracking physiological constraint, the fossil record may accurately record the transformative evolutionary impact of insect flight.

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Section: Sedimentological and Palaeontological Datamentioning

confidence: 99%

PhanerozoicpO₂and the early evolution of terrestrial animals

et al. 2018

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“…Radiometric dating of the underlying Milton of Noth Andesite at ca. 411 Ma (Parry et al, 2013(Parry et al, , 2011 has been subject to a dispute over its temporal relationship to hot spring activity associated with the cherts (Mark et al, 2013(Mark et al, , 2011 and predates the biostratigraphic dating of the Rhynie Chert relative to the global dating of the base of the Pragian Stage. Therefore, a soft maximum constraint may be defined at 411 Ma for the Rhynie Chert.…”

Section: Age Justificationmentioning

confidence: 99%

Fossil Calibrations for the Arthropod Tree of Life

Wolfe

Daley

Legg³

et al. 2016

Preprint

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Fossil age data and molecular sequences are increasingly combined to establish a timescale for the Tree of Life. Arthropods, as the most species-rich and morphologically disparate animal phylum, have received substantial attention, particularly with regard to questions such as the timing of habitat shifts (e.g., terrestrialisation), genome evolution (e.g., gene family duplication and functional evolution), origins of novel characters and behaviours (e.g., wings and flight, venom, silk), biogeography, rate of diversification (e.g., Cambrian explosion, insect coevolution with angiosperms, evolution of crab body plans), and the evolution of arthropod microbiomes. We present herein a series of rigorously vetted calibration fossils for arthropod evolutionary history, taking into account recently published guidelines for best practice in fossil calibration. These are restricted to Palaeozoic and Mesozoic fossils, no deeper than ordinal taxonomic level, nonetheless resulting in 79 fossil calibrations for 101 clades. This work is especially timely owing to the rapid growth of molecular sequence data and the fact that many included fossils have been described within the last five years. This contribution provides a resource for systematists and other biologists interested in deep-time questions in arthropod evolution.

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“…Radiometric dating places the age of the Rhynie Chert at 407.6 ± 2.2 My (see discussion in [29] and references cited therein), corresponding to the Early Devonian. We report various associated components of a freshwater environment including remains of the branchiopod crustacean Lepidocaris rhyniensis (Fig 1A).…”

Section: Resultsmentioning

confidence: 99%

A New Chytridiomycete Fungus Intermixed with Crustacean Resting Eggs in a 407-Million-Year-Old Continental Freshwater Environment

et al. 2016

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The 407-million-year-old Rhynie Chert (Scotland) contains the most intact fossilised remains of an early land-based ecosystem including plants, arthropods, fungi and other microorganisms. Although most studies have focused on the terrestrial component, fossilised freshwater environments provide critical insights into fungal-algal interactions and the earliest continental branchiopod crustaceans. Here we report interactions between an enigmatic organism and an exquisitely preserved fungus. The fungal reproductive structures are intermixed with exceptionally well-preserved globular spiny structures interpreted as branchiopod resting eggs. Confocal laser scanning microscopy enabled us to reconstruct the fungus and its possible mode of nutrition, the affinity of the resting eggs, and their spatial associations. The new fungus (Cultoraquaticus trewini gen. et sp. nov) is attributed to Chytridiomycota based on its size, consistent formation of papillae, and the presence of an internal rhizoidal system. It is the most pristine fossil Chytridiomycota known, especially in terms of rhizoidal development and closely resembles living species in the Rhizophydiales. The spiny resting eggs are attributed to the crustacean Lepidocaris rhyniensis, dating branchiopod adaptation to life in ephemeral pools to the Early Devonian. The new fungal interaction suggests that, as in modern freshwater environments, chytrids were important to the mobilisation of nutrients in early aquatic foodwebs.

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Discussion on ‘A high-precision U–Pb age constraint on the Rhynie Chert Konservat-Lagerstätte: time scale and other implications’

Cited by 41 publications

References 18 publications

PhanerozoicpO₂and the early evolution of terrestrial animals

PhanerozoicpO₂and the early evolution of terrestrial animals

Fossil Calibrations for the Arthropod Tree of Life

A New Chytridiomycete Fungus Intermixed with Crustacean Resting Eggs in a 407-Million-Year-Old Continental Freshwater Environment

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Discussion on ‘A high-precision U–Pb age constraint on the Rhynie Chert Konservat-Lagerstätte: time scale and other implications’

Cited by 41 publications

References 18 publications

PhanerozoicpO2and the early evolution of terrestrial animals

PhanerozoicpO2and the early evolution of terrestrial animals

Fossil Calibrations for the Arthropod Tree of Life

A New Chytridiomycete Fungus Intermixed with Crustacean Resting Eggs in a 407-Million-Year-Old Continental Freshwater Environment

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Product

Resources

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PhanerozoicpO₂and the early evolution of terrestrial animals

PhanerozoicpO₂and the early evolution of terrestrial animals