Search Results - "Sansom, Robert S."

Preservation and phylogeny of Cambrian ecdysozoans tested by experimental decay of Priapulus by Sansom, Robert S.

“…The exceptionally preserved Cambrian fossil record provides unique insight into the early evolutionary history of animals. Understanding of the mechanisms of…”
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Non-random decay of chordate characters causes bias in fossil interpretation by Purnell, Mark A, Sansom, Robert S, Gabbott, Sarah E

“…Exceptional preservation of soft-bodied Cambrian chordates provides our only direct information on the origin of vertebrates. Fossil chordates from this…”
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Fossilization can mislead analyses of phenotypic disparity by Smith, Thomas J, Sansom, Robert S, Pisani, Davide, Donoghue, Philip C J

“…Analyses of morphological disparity can incorporate living and fossil taxa to facilitate the exploration of how phenotypic variation changes through time…”
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Pigmented anatomy in Carboniferous cyclostomes and the evolution of the vertebrate eye by Gabbott, Sarah E., Donoghue, Philip C. J., Sansom, Robert S., Vinther, Jakob, Dolocan, Andrei, Purnell, Mark A.

“…The success of vertebrates is linked to the evolution of a camera-style eye and sophisticated visual system. In the absence of useful data from fossils,…”
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Decay of vertebrate characters in hagfish and lamprey (Cyclostomata) and the implications for the vertebrate fossil record by Sansom, Robert S., Gabbott, Sarah E., Purnell, Mark A.

“…The timing and sequence of events underlying the origin and early evolution of vertebrates remains poorly understood. The palaeontological evidence should shed…”
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Experimental analysis of soft‐tissue fossilization: opening the black box by Purnell, Mark A., Donoghue, Philip J. C., Gabbott, Sarah E., McNamara, Maria E., Murdock, Duncan J. E., Sansom, Robert S., Smith, Andrew

“…Taphonomic experiments provide important insights into fossils that preserve the remains of decay‐prone soft tissues, tissues that are usually degraded and…”
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Phylogenetic congruence, conflict and consilience between molecular and morphological data by Keating, Joseph N, Garwood, Russell J, Sansom, Robert S

“…Morphology and molecules are important data sources for estimating evolutionary relationships. Modern studies often utilise morphological and molecular…”
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A well-preserved 'placoderm' (stem-group Gnathostomata) upper jaw from the Early Devonian of Mongolia clarifies jaw evolution by Brazeau, Martin D, Yuan, Haobo, Giles, Sam, Jerve, Anna L, Zorig, E, Ariunchimeg, Ya, Sansom, Robert S, Atwood, Robert C

“…The origin of jaws and teeth remains contentious in vertebrate evolution. 'Placoderms' (Silurian-Devonian armoured jawed fishes) are central to debates on the…”
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Atlas of vertebrate decay: a visual and taphonomic guide to fossil interpretation by Sansom, Robert S., Gabbott, Sarah E., Purnell, Mark A., Orr, Patrick

“…Like many other important evolutionary transitions, our knowledge of the origin of vertebrates is limited to windows of exceptional preservation of soft‐bodied…”
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Unusual anal fin in a Devonian jawless vertebrate reveals complex origins of paired appendages by Sansom, Robert S., Gabbott, Sarah E., Purnell, M. A.

“…Jawed vertebrates (gnathostomes) have undergone radical anatomical and developmental changes in comparison with their jawless cousins (cyclostomes). Key among…”
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Bias and Sensitivity in the Placement of Fossil Taxa Resulting from Interpretations of Missing Data by Sansom, Robert S.

“…The utility of fossils in evolutionary contexts is dependent on their accurate placement in phylogenetic frameworks, yet intrinsic and widespread missing data…”
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Bite marks and predation of fossil jawless fish during the rise of jawed vertebrates by Randle, Emma, Sansom, Robert S

“…Although modern vertebrate diversity is dominated by jawed vertebrates, early vertebrate assemblages were predominantly composed of jawless fishes. Hypotheses…”
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Taphonomy and affinity of an enigmatic Silurian vertebrate, Jamoytius kerwoodi White by SANSOM, ROBERT S., FREEDMAN, KIM, GABBOTT, SARAH E., ALDRIDGE, RICHARD J., PURNELL, MARK A.

“…:  The anatomy and affinities of Jamoytius kerwoodi White have long been controversial, because its complex taphonomy makes unequivocal interpretation…”
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Dental Data Perform Relatively Poorly in Reconstructing Mammal Phylogenies: Morphological Partitions Evaluated with Molecular Benchmarks by Sansom, Robert S., Wills, Matthew Albion, Williams, Tamara

“…Phylogenetic trees underpin reconstructions of evolutionary history and tests of evolutionary hypotheses. They are inferred from both molecular and…”
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Multivariate mapping of ontogeny, taphonomy and phylogeny to reconstruct problematic fossil taxa by Reeves, Jane C, Sansom, Robert S

“…Exceptionally preserved fossils of soft-bodied organisms provide unique evidence of evolutionary history, but they are often contentious; different approaches…”
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The nearshore cradle of early vertebrate diversification by Sallan, Lauren, Friedman, Matt, Sansom, Robert S, Bird, Charlotte M, Sansom, Ivan J

“…Ancestral vertebrate habitats are subject to controversy and obscured by limited, often contradictory paleontological data. We assembled fossil vertebrate…”
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Fossilization causes organisms to appear erroneously primitive by distorting evolutionary trees by Sansom, Robert S., Wills, Matthew A.

“…Fossils are vital for calibrating rates of molecular and morphological change through geological time and are the only direct source of data documenting…”
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Parsimony, not Bayesian analysis, recovers more stratigraphically congruent phylogenetic trees by Sansom, Robert S., Choate, Peter G., Keating, Joseph N., Randle, Emma

“…Reconstructing evolutionary histories requires accurate phylogenetic trees. Recent simulation studies suggest that probabilistic phylogenetic analyses of…”
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Differences between hard and soft phylogenetic data by Sansom, Robert S., Wills, Matthew A.

“…When building the tree of life, variability of phylogenetic signal is often accounted for by partitioning gene sequences and testing for differences. The same…”
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Osteological characters of birds and reptiles are more congruent with molecular phylogenies than soft characters are by Callender-Crowe, Leah M, Sansom, Robert S

“…Abstract Despite increased use of genomic data in phylogenetics, morphological information remains vital for resolving evolutionary relationships, particularly…”
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