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 Alvania proditoris ( Thiele, 1925 ) n. comb. ( Figs 3 ; 48 ) Rissoa proditoris Thiele, 1925: 80 , pl. 6, fig. 9. TYPE MATERIAL . — Lectotype . South Africa • dd; Valdivia Stn 101 ; 33°50’27”S , 25°48’46”E ; ZMB/Ma.64965 (here designated). Paralectotypes . South Africa • 5 dd; Valdivia Stn 95 ; 34°51’0”S , 19°37’47”E ; 80 m ; ZMB/Ma.64965 • 3 dd; Valdivia Stn 101 ; 33°50’27”S , 25°48’46”E ; ZMB/Ma.64965 . Angola • 1 dd; Valdivia Stn 81 ; 16°26’27”S , 11°41’27”E ; ZMB/ Ma.64965 . FIG . 3. — Alvania proditoris ( Thiele, 1925 ) n. comb. : A -E , lectotype, height 2.75 mm, width 1.65 mm, South Africa, Valdivia Stn 101, depth unknown, ZMB/Moll. N° 64965: shell ( A -C ); detail of the first whorls ( D , E ); F , original labels; G , original drawing. Scale bars: D, E, 20 μm. TYPE LOCALITY . — South Africa , Valdivia Stn 101; 33°50’27”S , 25°48’46”E . DISTRIBUTION . — Only known from southern Africa (Valdivia Stns 95 and 101) and from a station in southern Angola (Valdivia Stn 81) ( Fig. 48 ). DIAGNOSIS . — Alvania with small (height < 3 mm ), robust shell, ovate-conical; spiral sculpture stronger than axial; aperture piriform, peristome continuous and simple, outer lip with robust; umbilical fissure absent. Protoconch paucispiral, dome-shaped, with spiral sculpture. Colouration uniform whitish. REMARKS The lot from southern Angola (Valdivia Stn 81) comes form a completely distinct biogeographic area, and we are not sure it is not a case of mislabelling. In any case, to stabilize the type locality we have designated as lectotype a specimen from the Cape area (Valdivia Stn 95). Rissoa proditoris Thiele, 1925 is clearly a member of Alvania , with its shell devoid of umbilical fissure, with double sculpture (axial and spiral), piriform aperture, continuous and simple peristome, outer lip with robust varix, dome-shaped paucispiral protoconch with spiral sculpture. We accordingly propose Alvania proditoris ( Thiele, 1925 ) n. comb. as a new combination for Rissoa proditoris Thiele, 1925 .