77 pages matching sinuated radial ribs in this book
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List of Figures
Patterns of Morphological variation
290 other sections not shown
2nd parietal Aaadonta accessory traces Anceyodonta apertural barriers Apex and spire apical Aukena Austral Islands Australdonta bladelike body whorl BPBM brood chamber callus Charopidae Columellar barrier Cook Islands Cookeconcha crowded spiral riblets D/U ratio decoiling deeply recessed diameter Endodonta Endodontidae evenly rounded expanded and serrated extending posteriorly flattened FMNH Gambier Islands Gambiodonta Garrett genus gradual anterior descension H/D ratio Holotype interstices lamellar lectotype Libera lower palatal major ribs Mangareva Mautodontha Microsculpture Minidonta moderately narrow Nesodiscus one-eighth whorl one-quarter whorl Opanara Orangia pair of major palatal barriers pallial cavity Paratypes Parietal barriers pattern Pease penis periphery Pfeiffer pilasters Planudonta pneumostome posterior Postnuclear whorls prominent protractively sinuated radial radial riblets radula Raivavae Rapa reduced in height riblets Rikitea Ruatara shell axis sinuated radial ribs slightly Society Islands Solem species specimens spiral cording Station Sutures Taipidon taxa Thaumatodon umbilical umbilicus upper parietal variation whorl count whorls strongly rounded