Results 1 to 10 of about 32,157 (156)

Using abundance data to assess the relative role of sampling biases and evolutionary radiations in Upper Muschelkalk ammonoids [PDF]

, 2011
The Middle Triassic ammonoid genus Ceratites diversified spectacularly within the Germanic Muschelkalk Basin during the Anisian/Ladian (244–232 Mya). Previous studies have interpreted this diversification as a sequence of rapid, endemic radiations from a
Kiessling, Wolfgang, McGowan, Alistair J.   +1 more
core   +1 more source

Atmospheric Consequences of Cosmic Ray Variability in the Extragalactic Shock Model II: Revised ionization levels and their consequences

, 2010
It has been suggested that galactic shock asymmetry induced by our galaxy's infall toward the Virgo Cluster may be a source of periodicity in cosmic ray exposure as the solar system oscillates perpendicular to the galactic plane.
Adrian L. Melott, Aguirre, Alpen, Atri, Bancroft, Binney, Björn, Blaustein, Boucher, Brian C. Thomas, Cornette, Davidson, Dimitra Atri, Djemil, Ejzak, Foukal, Gehrels, Gies, Graham W. Wilson, Harfoot, Hatch, Häder, Jagger, Juckett, Juckett, Kiesecker, Lieberman, Lockwood, Madronich, McCallum, Medvedev, Melott, Melott, Melott, Melott, Melott, Michael J. Murray, Mikhail V. Medvedev, Natarajan, Overholt, Pukkala, Rohde, Ruderman, Scherer, Shaffer, Solanki, Svensmark, Tevini, Thomas, Thomas, Thomas   +50 more
core   +1 more source

Ecological succession of a Jurassic shallow-water ichthyosaur fall. [PDF]

, 2014
After the discovery of whale fall communities in modern oceans, it has been hypothesized that during the Mesozoic the carcasses of marine reptiles created similar habitats supporting long-lived and specialized animal communities.
A Glover, A Kaim, A Kaim, A Kaim, A Sheldon, C Bristow, C Clausen, C Gaillard, C Smith, C Smith, CE Braby, CR Smith, DL Distel, DM Martill, DM Martill, DM Martill, F Garcia-Pichel, F Garcia-Pichel, G Bianucci, H Astibia, HS Chafetz, J Taylor, JA Hogler, JA Hogler, JA Massare, JW Deming, K Amano, K Duff, K Olu-Le Roy, L Lundsten, LA Levin, M Hrs-Brenko, ME Jans, ME Williams, P Dando, PA Allison, PB Wignall, PD Taylor, R Bromley, R Motani, R Motani, R Riding, R Twitchett, R Vrijenhoek, RC Vrijenhoek, RS Shapiro, S Danise, S Danise, S Danise, S Danise, S Dominici, S Golubic, S Kiel, S Kiel, S Kiel, T Treude, V De Buffrenil, V Thiel, Z Lewy   +58 more
core   +3 more sources

The last common bilaterian ancestor [PDF]

, 2002
Many regulatory genes appear to be utilized in at least superficially similar ways in the development of particular body parts in Drosophila and in chordates.
Davidson, Eric H., Erwin, Douglas H.
core  

Molecular and fossil evidence place the origin of cichlid fishes long after Gondwanan rifting. [PDF]

, 2013
Cichlid fishes are a key model system in the study of adaptive radiation, speciation and evolutionary developmental biology. More than 1600 cichlid species inhabit freshwater and marginal marine environments across several southern landmasses.
Alex Dornburg, Benjamin P. Keck, C. Darrin Hulsey, Christopher H. Martin, Matt Friedman, Matt Friedman, Peter C. Wainwright, Ron I. Eytan, Thomas J. Near, Thomas J. Near   +9 more
core   +1 more source

A combinatorial approach to angiosperm pollen morphology [PDF]

, 2016
Angiosperms (flowering plants) are strikingly diverse. This is clearly expressed in the morphology of their pollen grains, which are characterized by enormous variety in their shape and patterning.
Blackmore S, Gould SJ, Harley MM, Lewontin RC, Lupia R, McGhee GR, Roubik DW, Thompson DW   +7 more
core   +1 more source

Climatic change in northeastern Brazil: paleoparasitological data

Memorias do Instituto Oswaldo Cruz, 1993
Trichuris eggs were observed in Kerodon rupestris coprolites dated 9,000 years before present, collected in archeological sites of São Raimundo Nonato, northeastern Brazil.
Adauto Araujo, Adriana Rangel, Luiz Fernando Rocha Ferreira   +2 more
doaj   +1 more source

Shared patterns in body size declines among crinoids during the Palaeozoic extinction events

Scientific Reports, 2021
Crinoids were among the most abundant marine benthic animals throughout the Palaeozoic, but their body size evolution has received little attention. Here, we compiled a comprehensive database on crinoid calyx biovolumes throughout the Palaeozoic. A model
Mariusz A. Salamon, Tomasz Brachaniec, Dorota Kołbuk, Anwesha Saha, Przemysław Gorzelak   +4 more
doaj   +1 more source

Climate change and the selective signature of the Late Ordovician mass extinction [PDF]

, 2012
Selectivity patterns provide insights into the causes of ancient extinction events. The Late Ordovician mass extinction was related to Gondwanan glaciation; however, it is still unclear whether elevated extinction rates were attributable to record ...
Finnegan, Seth, Fischer, Woodward W., Heim, Noel A., Peters, Shanan E.   +3 more
core   +3 more sources

Comparison of diverse mandibular mechanics during biting in Devonian lungfishes

iScience
Summary: Fossil lungfish from the Late Devonian Gogo Formation, Australia, feature some of the most remarkable and specialized mandible morphologies in their 415-million-year history.
Joshua Bland, Hugo Dutel, John A. Long, Matteo Fabbri, Joseph Bevitt, Kate Trinajstic, Olga Panagiotopoulou, Alice M. Clement   +7 more
doaj   +1 more source