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 Parashiela invisibilis ( Hedley, 1899 ) ( Figs 22 ; 50 ) Rissoa invisibilis Hedley, 1899: 418 , fig. 9. TYPE MATERIAL . — Holotype . Tuvalu Islands • dd; Funafuti Atoll ; 8°31’1”S , 179°13’1”E ; 1896; C. Hedley leg., Royal Society Coral Boring Expedition; AMS-C.5892 . TYPE LOCALITY . — Tuvalu Islands: Funafuti Atoll. DISTRIBUTION . — Tropical Pacific ranging from the Philippines to southern Japan and to Hawaii (van Gemert 2016: 7) ( Fig. 50 ). DIAGNOSIS . — Parashiela small for the genus, height 1.20 mm ( holotype ), ovate-conic. Protoconch paucispiral. Teleoconch with thin orthocline axial ribs, reaching the base and entering the narrow umbilical fissure; four thin spiral cordlets on the last whorl, 2 above the aperture and on upper whorls. Peristome duplicated, with thick and broad varix crossed by evident growth striae. Colouration uniform white. REMARKS We note that the holotype has two (not one as originally described: Hedley 1899: 418 ; van Gemert 2016: 7) very thin spiral cordlets above the aperture and on upper whorls. We suspect that several of the specimens reported in the literature as P. invisibilis (e.g. Ekawa 1993: 80 , pl. 2, fig. 14; Hasegawa 2000:150 , pl. 75, fig. 12 [two images]; Hasegawa 2006b: 108 , fig. 6; Poppe & Tagaro 2011 : pl. 1306, fig. 3; Middelfart et al. 2020: 26 , fig. 4A, as Parashiela cf. invisibilis ; but also by Severns 2011: 116 , pl. 42, figs 1, 2, as Parashiela sp. and Parashiela beetsi ), which are larger and with more marked spiral and axial sculptures, may actually belong to one or more distinct and probably undescribed species. FIG . 23. — Parashiela liddelliana ( Hedley, 1907 ) : A , B , holotype, height 1.2 mm, width 0.76 mm, Queensland, Capricorn Group, Mast Head Reef, depth unknown, AMS-C.19544 (Images: A. C. Miller, Copyright: Australian Museum); C , original drawing. See under P. rimatara n. sp. and P. expansilabrum n. sp. for detailed comparisons.