APPENDIX 1 in Shallow-water Rissoidae of the genera Alvania Risso 1826 Haurakia Iredale 1915 Parashiela Laseron 1956 Simulamerelina Ponder 1985 and Subestea Cotton 1944 Gastropoda Caenogastropoda Rissooidea from French Polynesia with the description of a new deep-water genus
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APPENDIX 1. — Measurements of teleoconch and protoconch of Alvania letourneuxi n. sp. in mm: 1, holotype, Tuamotu, Makemo, Passe Arikitamiro.
Teleoconch1Height1.60Width0.95Height/Width ratio1.74Aperture height0.68Height/aperture height ratio2.35No. whorls2.90No. axial ribs on last whorls21No. spiral cords on last whorls (above aperture)7 (3)StartII, IIIProtoconch1Height0.250Diameter of nucleus0.075Diameter of first half whorl0.150Maximun diameter0.200No. whorls1.00Paucispiralyes
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2025-04-05
