High cryptic diversity in the kleptoparasitic genus Hyalorisia Dall, 1889 (Littorinimorpha: Capulidae) with the description of nine new species from the Indo-West Pacific Author Fassio, Giulia Author Russini, Valeria Author Buge, Barbara Author Schiaparelli, Stefano Author Modica, Maria Vittoria Author Bouchet, Philippe Author Oliverio, Marco text Journal of Molluscan Studies 2020 Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen 2020-09-18 86 4 401 421 http://dx.doi.org/10.1093/mollus/eyaa028 journal article 10.1093/mollus/eyaa028 613998a5-1f0e-46b2-9141-a0bce996b557 4464900 6DBF9C90-3CAA-49F3-A9ED-9611D073840F Hyalorisia lehibe Fassio, Bouchet & Oliverio new species MOTU-5 ( Figs 3E , 5A ) Type material : Holotype : off Mahajanga, NW Madagascar , MIRIKY, Stn CP3253 , 15°25 S , 45°55 E , 943–950 m , MNHN-IM-2007-39212 . One paratype : same locality as holotype, MNHN-IM-2007-39206 . Etymology : After the Malagasy adjective ‘lehibe’, meaning ‘big or large’, referring to the size of this species. ZooBank registration : urn:lsid:zoobank.org:act: FCF15E07-177B-4E13-B2DF-0DD8E9261DC8 . COI-based diagnosis : Four diagnostic (autapomorphic) positions were scored in the alignment: 157(C), 292(G), 469(G) and 631(G). Shell (data for holotype shown within parentheses) : Medium sized for the genus: length 15–17 (15) mm, width 12.5–14.5 (12.5) mm, height 4–5 (4) mm; thin, rounded, depressed; white shell surface with smooth yellowish periostracum; anterior margin slightly angled; protoconch (intact only in holotype ) of 1.1 whorls, diameter of nucleus 0.13 mm ; teleoconch smooth except for distinct commarginal growth ridges; apertural margin thin, interior glossy white; lamella wide, width 1.8–2.48 (1.8) mm. Soft parts : Not examined; damaged due to tissue clipping. Host : The holotype was found attached to P. watsoni ( MNHN-IM- 2007-39211). The paratype (MNHN-IM-2007-39206) was found at the same station and has a registration number that is close to those of two specimens of P. watsoni (MNHN-IM-2007- 39209 and MNHN-IM-2007-39210); the shells of both bivalves bear a mark that corresponds to the contour of the Hyalorisia specimen. Distribution : So far known only from the Madagascar side of the Mozambique Channel, at depths of 943– 950 m. Remarks : Hyalorisia lehibe n. sp. was found off Mahajanga , NW Madagascar , where it occurred sympatrically with H. madagascarensis n. sp. (MOTU-10) and H. kely n. sp. (MOTU-7).