APPENDIX 18 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

APPENDIX 18. — Measurements of teleoconch and protoconch of Simulamerelina gracilis n. sp. in mm, with range, mean and standard deviation: 1, holotype, Tuamotu,Moruroa Atoll,intertidal; 2, paratype Tuamotu,Moruroa Atoll,intertidal.
Teleoconch12Min-maxMean StdHeight2.452.132.13-2.452.29 0.226Width1.080.980.98-1.081.03 0.071Height/Width ratio2.272.172.17-2.272.22 0.067Aperture height0.850.730.73-0.850.79 0.085Height/aperture height ratio2.882.922.88-2.922.9 0.025No. whorls4.704.204.20-4.704.45 0.354No. axial ribs on last whorls111211-1211.5 0.707No. spiral cords on lastwhorls (above aperture)7 (3)7 (3)7 (3)7 (3) 0 (0)Protoconch12Min-maxMean StdHeight0.3120.325 0.312-0.325 0.318 0.009Diameter of nucleus0.1120.100 0.100-0.112 0.106 0.008Diameter of first half whorl0.2000.212 0.200-0.212 0.206 0.008Maximun diameter0.2750.275 0.2750.275 0No. whorls1.201.101.10-1.201.15 0.070Paucispiralyesyesyesyes –