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 Author Amati, Bruno Largo Giuseppe Veratti, 37 / D, I- 00146 Roma (Italy) bruno _ amati @ yahoo. it amati@yahoo.it Author Giulio, Andrea Di Dipartimento di Scienze, LIME Lab, Università “ Roma Tre ”, Viale Marconi, 446, I- 00146 Roma (Italy) and NBFC, National Biodiversity Future Center, Palermo I- 90133 (Italy) andrea. digiulio @ uniroma 3. it Author Oliverio, Marco Dipartimento di Biologia e Biotecnologie ‘ Charles Darwin’, Sapienza Università di Roma, Viale dell’Università 32, I- 00185 Roma (Italy) marco. oliverio @ uniroma 1. it text Zoosystema 2023 2023-12-22 45 25 803 892 https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2023v45a25.pdf journal article 283961 10.5252/zoosystema2023v45a25 6247b5e8-e434-4ff4-a408-d8ee87c09da7 1638-9387 10458066 054D312B-C54B-459D-8A47-AC9CB681D7D4
TABLE 1. — Measurements of teleoconch and protoconch of Polynesian species of Alvania and Ellenstrongia n. gen., in mm, with minimum-maximum range and mean [standard deviation in square parentheses]; sample size in parentheses with the species name; M, protoconch multispiral; P, protoconch paucispiral.
Alvania letourneuxi n. sp. (1)Alvania herosae n. sp. Morph A + B (17 + 20)Alvania herosae n. sp. Morph A (17)Alvania herosae n. sp. Morph B (20)Alvania parvimaculata n. sp. (5)Alvania prosocostata n. sp. (9)Alvania uapou n. sp. (10)Ellenstrongia tarasoc n. gen., n. sp. (7)
Teleoconch
Height1.601.55-2.471.55-2.251.67-2.471.42-1.701.77-2.051.57-1.823.82-4.50
2.061.922.181.541.941.694.11
[0.254][0.228][0.209][0.124][0.098][0.076][0.215]
Width0.950.90-1.320.90-1.250.97-1.320.85-0.951.10-1.250.85-0.971.82-2.12
1.131.081.170.921.180.911.95
[0.109][0.114][0.092][0.045][0.047][0.035][0.090]
Height/Width ratio1.691.67-2.021.67-1.881.72-2.021.55-1.791.56-1.711.65-1.982.03-2.17
1.811.751.871.681.641.862.11
[0.0932][0.0622][0.0800][0.1068][0.0519][0.1076][0.049]
Aperture height0.680.7-1.050.70-1.000.70-1.050.62-0.720.75-0.920.60-0.651.25-1.47
0.850.810.870.680.860.621.36
[0.0856][0.087][0.079][0.041][0.048][0.024][0.075]
Height/aperture height ratio1.742.15-2.652.15-2.532.34-2.652.10-2.372.14-2.362.49-2.922.89-3.20
2.432.342.512.272.242.713.02
[0.1300][0.1105][0.0908][0.1245][0.0689][0.1302][0.098]
No. whorls2.903-4.23.00-4.103.20-4.202.35-3.203.15-3.503.20-3.505.20-5.75
3.73.473.92.783.313.345.36
[0.36][0.357][0.27][0.378][0.110][0.129][0.264]
No. axial ribs on last whorls2113-2115-2113-2116-1922-2914-2511-13
16.517.616.0516.824.519.412.1
[1.98][2.13][1.820][1.30][2.56][3.36][0.69]
No. spiral cords on last whorls (above aperture)7(3)7-13 (3-7)8-13 (4-7)7-10 (3-5)7 (3)11-14 (5-7)8-9 (4)14-17(9-10)
9.6 (4.7)11 (5.52)8.3 (4.05)7 (3)12.37 (6.37)8.5 (4)15.3(9.3)
[1.69 (0.96)][1.3 (0.799)][0.75 (0.394)][0 (0)][1.302 (0.744)][0.53 (0)][1.11 (2.16)]
Protoconch
Height0.2500.205-0.2750.205-0.2750.212-0.2750.250-0.2620.220-0.2750.237-0.2870.437-0.525
0.2410.2400.2410.2520.2460.2620.448
[0.0154][0.0166][0.0147][0.0054][0.0161][0.0199][0.029]
Diameter of nucleus0.0750.100-0.1250.100-0.1250.100-0.1250.100-0.1250.112-0.1250.100-0.1250.057-0.127
0.1150.1160.1140.1100.1170.1100.085
[0.0070][0.0075][0.0072][0.0104][0.0068][0.0113][0.024]
Diameter of first half whorl0.1500.20-0.250.200-0.2370.200-0.2500.170-0.2120.212-0.2370.175-0.2200.125-0.200
0.220.2150.2200.1930.2280.1970.166
[0.015][0.0149][0.0149][0.0182][0.0092][0.0145][0.028]
Maximum diameter0.2000.275-0.3370.287-0.3370.275-0.3250.250-0.3000.275-0.3250.287-0.3370.387-0.433
0.3080.3120.3030.2720.3040.3070.407
[0.0142][0.0117][0.0152][0.0186][0.0191][0.0146][0.015]
No. of whorls1.001-1.31.00-1.301.15-1.301.15-1.251.10-1.251.25-1.402.75-3.20
1.21.221.221.21.211.332.95
[0.05][0.064][0.033][0.03][0.046][0.042][0.204]
Protoconch typePPPPPPPM