Spezzaferri, Silvia Kucera, Michal Nicholas Pearson, Paul Susan Wade, Bridget Rappo, Sacha Robert Poole, Christopher Morard, Raphaël Stalder, Claudio A morphometric analysis of the primary aperture among different morphologies of “<i>Globigerinoides</i>”. <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> 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
    https://plos.figshare.com/articles/figure/_A_morphometric_analysis_of_the_primary_aperture_among_different_morphologies_of_Globigerinoides_/1429560
10.1371/journal.pone.0128108.g003