The Hydrodynamic Behavior of Sclerites from the Trilobite Flexicalymene meeki

Lask, Peter B.

doi:10.2307/3515144

Cited by 17 publications

(10 citation statements)

References 4 publications

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“…Vertebrates are paradigmatic fossils; taphonomic experiments can be carried out to test how decay affects their general morphology 1 , as well as processes in bone diagenesis 2 . Invertebrates have also been the subject of taphonomic experiments that can have phylogenetic implications 3 and biostratinomic factors are often well known in these animals 4 – 6 . Based on this, it is becoming increasingly clear that small morphological features (e.g.…”

Section: Introductionmentioning

confidence: 99%

A new high-resolution 3-D quantitative method for analysing small morphological features: an example using a Cambrian trilobite

Esteve

Zhao

Maté-González

et al. 2018

Sci Rep

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Taphonomic processes play an important role in the preservation of small morphological features such as granulation or pits. However, the assessment of these features may face the issue of the small size of the specimens and, sometimes, the destructiveness of these analyses, which makes impossible carrying them out in singular specimen, such as holotypes or lectotypes. This paper takes a new approach to analysing small-morphological features, by using an optical surface roughness (OSR) meter to create a high-resolution three-dimensional digital-elevation model (DEM). This non-destructive technique allows analysing quantitatively the DEM using geometric morphometric methods (GMM). We created a number of DEMs from three populations putatively belonging to the same species of trilobite (Oryctocephalus indicus) that present the same cranidial outline, but differ in the presence or absence of the second and third transglabellar furrows. Profile analysis of the DEMs demonstrate that all three populations show similar preservation variation in the glabellar furrows and lobes. The GMM shows that all populations exhibit the same range of variation. Differences in preservation are a consequence of different degrees of cementation and rates of dissolution. Fast cementation enhances the preservation of glabellar furrows and lobes, while fast dissolution hampers preservation of the same structures.

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Section: Introductionmentioning

confidence: 99%

A new high-resolution 3-D quantitative method for analysing small morphological features: an example using a Cambrian trilobite

Esteve

Zhao

Maté-González

et al. 2018

Sci Rep

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“…Taphonomy has emerged as a vibrant discipline that has stepped beyond this narrow vision (Behrensmeyer and Kidwell, 1985), Trilobite workers have been at the forefront of this new taphonomic research and have demonstrated novel applications of preservational data in paleoecology (Speyer and Brett, 1985) and in sedimentary facies analysis (Speyer and Brett, 1986). More conventional work on the interpretation of trilobite accumulations has also flourished, with contributions ranging from experimental (Hesseibo, 1987;Lask, 1993) and field-based (Speyer, 1987) studies of sclerite orientation and its hydrodynamic significance, to the implications of taphonomic sorting for paleoecologic interpretation (Westrop, 1986;Mikulic, 1990). This issue features detailed taphonomic studies of two Late Ordovician trilobite assemblages: Hughes and Cooper look at a calymenid-dominated deposit from the Kope Formation of Ohio, while Brett and colleagues examine the famous Walcott-Rust Quarry of New York State along with providing a much-needed modern overview of the fauna.…”

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confidence: 99%

Trilobite paleobiology: Past, present, and future

Adrain

Westrop

1999

J. Paleontol.

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The first major international trilobite conference (which also dealt with related arthropod groups) was convened by David Bruton in Oslo in 1973. That meeting resulted in a 467 page proceedings volume (Martinsson, 1975) that has become an indispensible reference on arthropod paleobiology. With its abundance of high-quality empirical work and influential ideas, the ongoing utility of “Fossils and Strata 4” is assured, yet it is also a fascinating microcosm of the themes and concerns of paleontology as a whole a quarter of a century ago. Paleoecology blossomed in the late 1960s and early 1970s. Autecology, and particularly functional morphology, dominates the volume, accounting for about one-third of the contributions. Plate tectonics was a relatively recent development in 1973 and, following the lead of Whittington and Hughes (1972), several papers tackled trilobite paleobiogeography. They vary from a bold attempt to determine oceanic circulation through the Ordovician by Ross to more conventional studies of biogeographic distribution that were aimed at providing further support for concepts of continental drift. There was a burgeoning interest in community paleoecology, and Richard Fortey's (1975) now-classic paper on the Early Ordovician faunas of Spitsbergen was the first to define trilobite “communities.” The volume was rounded out by diverse papers on trilobite anatomy based on material from the Burgess Shale and Beecher's Trilobite Bed, the microstructure of the trilobite cuticle, trilobites eyes, high level classification of trilobites, and various evolutionary themes (character displacement in agnostoids; adaptive radiation in Cambrian trilobites).

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“…Hydodynamic sorting of trilobite sclerites is an important control on relative abundance (Westrop, 1986b) and potentially a directional taphonomic bias. Only one actualistic study on the hydrodynamic behavior of trilobite sclerites has been conducted (Lask, 1993), and since this study was only concerned with one species of trilobite, it is impossible to draw broader conclusions from it about the interaction between size and shape within different hydrodynamic conditions. Additionally, certain structural morphologies (the doublure, the presence of arches, see Wilmot, 1990) may make a sclerite more resistant to breakage during the hydrodynamic sorting, but the relative importance of these features remains to be studied.…”

Section: Taphonomymentioning

confidence: 99%

Systematics of late Cambrian (Sunwaptian) trilobites from the St. Charles Formation, southeastern Idaho

Hegna¹

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Previously unreported silicified trilobite faunas occur in a narrow stratigraphic interval of the Upper Cambrian (Sunwaptan) St. Charles Formation in the Bear River Range of southeastern Idaho. The faunas occur in four closely spaced rudstones and trilobite packstones indicating deposition in a shallow subtidal setting above storm wave base. At least 23 species are represented, included two undescribed genera and several undescribed species. The faunas are notable for their high trilobite abundance and pervasive silicification. Most coeval faunas have been described on the basis of small numbers of "crack-out" specimens, and the new material reveals many details of anatomy, including knowledge of most exoskeletal sclerites. The four trilobite-yielding beds contain markedly different taxon-abundance profiles, yet most species are shared between them. This suggests multiple, taphonomically-controlled samples of a similar underlying distribution, though true ecological variation cannot be discounted. v TABLE OF CONTENTS

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The Hydrodynamic Behavior of Sclerites from the Trilobite Flexicalymene meeki

Cited by 17 publications

References 4 publications

A new high-resolution 3-D quantitative method for analysing small morphological features: an example using a Cambrian trilobite

A new high-resolution 3-D quantitative method for analysing small morphological features: an example using a Cambrian trilobite

Trilobite paleobiology: Past, present, and future

Systematics of late Cambrian (Sunwaptian) trilobites from the St. Charles Formation, southeastern Idaho

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