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 8663 10.1093/mollus/eyaa028 613998a5-1f0e-46b2-9141-a0bce996b557 4464900 6DBF9C90-3CAA-49F3-A9ED-9611D073840F Hyalorisia profunda Fassio, Bouchet & Oliverio new species MOTU-9 ( Figs 3I , 6A ) Type material : Holotype : South China Sea, ZHONGSHA 2015, Stn CP4137 , 19°53 N , 114°25 E , 524–536 m , MNHN-IM-2013-59695 . One paratype : same locality as holotype, MNHN-IM-2013-59696 . Material examined : Type and other material (MNHN-IM-2007-33806, MNHN-IM-2007-33828 and MNHN-IM-2013-44655). Etymology : After the Latin adjective profundus , -a , -um , meaning deep, with reference to the fact that this species occurs at great depths. ZooBank registration : urn:lsid:zoobank.org:act: 668C5D77-6FAB-457D-A7D9-0F142DC12E49 . COI-based diagnosis : Three diagnostic (autapomorphic) positions in the alignment: 52(G), 325(T) and 359(C). Shell (data for holotype shown within parentheses) : Size small to medium for the genus: length 6–9 (7) mm, width 4–6 (5) mm, height 2–3 (2) mm; thin, ellipsoidal to rounded, depressed; white shell surface with smooth yellowish periostracum; anterior margin rounded; protoconch of 1–1.1 (1.1) whorls, diameter of nucleus 0.1–0.21 (0.16) mm; teleoconch smooth except for distinct commarginal growth ridges; apertural margin thin, interior glossy white; lamella narrow, width 0.29–0.69 (0.4) mm. Soft parts : Not examined; damaged by tissue clipping. Host : Based on the field label, the holotype and paratype were attached to a Propeamussium sp.; at that station, the only propeamussiids collected were P. jeffreysii and P. caducum . Two specimens (MNHN-IM-2007-33806 and MNHN-IM-2007-33828) were found at the same station; these and specimens of P. caducum (MNHN-IM-2007-33805 and MNHN-IM-2007-33827, respectively) have consecutive registration numbers, and MNHN-IM-2007-33827 also has a mark on the shell that corresponds to the contour of the Hyalorisia specimen. Another Hyalorisia specimen (MNHN-IM-2013-44655) was found at a station where the only propeamussiid collected was P. caducum . Distribution : So far known only from the South China Sea and the Philippines , at depths of 536–1,240 m . Remarks : Hyalorisia profunda n. sp. was found syntopically with H. nanhaiensis n. sp. (MOTU-6) on the continental slope of the South China Sea (ZHONGSHA 2015: Stn CP4137).