Hyalorisia nanhaiensis Fassio, Bouchet &amp; Oliverio 2020, new species
Creators: name: Fassio, Giulia
name: Russini, Valeria
name: Buge, Barbara
name: Schiaparelli, Stefano
name: Modica, Maria Vittoria
name: Bouchet, Philippe
name: Oliverio, Marco
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Capulidae
Hyalorisia
Hyalorisia nanhaiensis

description: <i>Hyalorisia nanhaiensis</i> Fassio, Bouchet &amp; Oliverio new species MOTU-6 (Figs 3F, 5B, 7E, N) <i>Type material</i>: Holotype: S of Dongsha (=Pratas) Islands, South China Sea, ZHONGSHA 2015, Stn CP4162, 20°33 N, 116°40 E, 528–540 m, MNHN-IM-2013-59534 (male). <i>Material examined</i>: Holotype and other material (MNHN-IM-2007-34793, MNHN-IM-2007-34796, MNHN-IM-2013-59496, MNHN-IM-2013-59697 and MNHN-IM-2013-61770). <i>Etymology</i>: After the Chinese name for the South China Sea (‘Nanhai’), the general area of the type locality. <i>ZooBank registration</i>: urn:lsid:zoobank.org:act: 2F50B7B5-DF14-423F-B123-34B64BCB045C. <i>COI-based diagnosis</i>: Six diagnostic (autapomorphic) positions in the alignment: 75(G), 263(C), 271(C), 322(G), 400(A) and 631(C). <i>Shell (data for holotype shown within parentheses)</i>: Size small to medium for the genus: length 4.16–9 (8.5) mm, width 3.12–6 (6) mm, height 1.6–3 (3) mm; thin, ellipsoidal, depressed; white shell surface with smooth yellowish periostracum; anterior margin rounded or gently angled; protoconch of 1–1.2 (1.2) whorls, diameter of nucleus 0.12– 0.24 (0.15) mm; teleoconch smooth except for distinct commarginal growth ridges; apertural margin thin, interior glossy white; lamella from wide to narrow, width 0.4–1.12 (0.83) mm. <i>Soft parts (ethanol preserved)</i>: Head completely whitish or grey at the base; cephalic tentacles completely whitish or grey from the base to half/two-thirds of the length; pseudoproboscis whitish; mantle completely whitish to black with whitish border. <i>Radula</i>: Taenioglossate, 2-1-R-1-2; marginal teeth sickle shaped; internal marginals with few denticles on the inner edge; lateral teeth triangular, highly denticulated on both edges; rachidian tooth triangular, highly denticulated on both edges. <i>Host</i>: Holotype (MNHN-IM-2013-59534) was attached to <i>P. jeffreysii</i> (MNHN-IM-2013-59533). Of the other specimens, two (MNHN-IM-2007-34796 and MNHN-IM-2013-59496) were found attached to <i>P. jeffreysii</i> (MNHN-IM-2007-34797 and MNHN-IM-201359495, respectively) and two (probably a female MNHN-IM-2013-59697 and a male MNHN-IM-2013-61770) attached to the same individual of a <i>Propeamussium</i> sp. (MNHN-IM-2013-61769). <i>Distribution</i>: So far known only from the South China Sea and the Philippines, at depths of 358– 556 m. <i>Remarks</i>: <i>Hyalorisia nanhaiensis</i> n. sp. was found syntopically with <i>H. profunda</i> n. sp. (MOTU-9) on the continental slope of the South China Sea (ZHONGSHA 2015: Stn CP4137).
description: Published as part of <i>Fassio, Giulia, Russini, Valeria, Buge, Barbara, Schiaparelli, Stefano, Modica, Maria Vittoria, Bouchet, Philippe &amp; Oliverio, Marco, 2020, High cryptic diversity in the kleptoparasitic genus Hyalorisia Dall, 1889 (Littorinimorpha: Capulidae) with the description of nine new species from the Indo-West Pacific, pp. 401-421 in Journal of Molluscan Studies (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) 86 (4)</i> on pages 415-416, DOI: 10.1093/mollus/eyaa028, http://zenodo.org/record/4464900