10.1371/journal.pone.0128108.g003 Silvia Spezzaferri Silvia Spezzaferri Michal Kucera Michal Kucera Paul Nicholas Pearson Paul Nicholas Pearson Bridget Susan Wade Bridget Susan Wade Sacha Rappo Sacha Rappo Christopher Robert Poole Christopher Robert Poole Raphaël Morard Raphaël Morard Claudio Stalder Claudio Stalder A morphometric analysis of the primary aperture among different morphologies of “<i>Globigerinoides</i>”. Public Library of Science 2015 New Genus Trilobatus Planktonic foraminifera ruber group clusters ruber group trilobus group type species Globigerina triloba Reuss genus Globigerinoides ruber clade sister taxon 2015-05-28 04:12:08 Figure https://plos.figshare.com/articles/figure/_A_morphometric_analysis_of_the_primary_aperture_among_different_morphologies_of_Globigerinoides_/1429560 <p>The Symmetry Index (SI) and the Primary Aperture Diameter Ratio (PADR) are defined in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0128108#pone.0128108.g001" target="_blank">Fig 1</a>. Dashed line indicates the best discrimination between specimens attributed to the <i>trilobus</i> (blue) and <i>ruber</i> (red) lineages, determined by linear discriminant analysis between the two groups in Zone M3. The line is perpendicular to the linear discriminant function at the position of the optimum discrimination score (z = 0). Specimens on each side of the line would be classified as belonging to either one of the groups in Zone M3.</p>