Hyalorisia melanesica 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 melanesica

description: <i>Hyalorisia melanesica</i> Fassio, Bouchet &amp; Oliverio new species MOTU-8 (Figs 3H, 5D, 7G, P) <i>Type material</i>: Holotype: Bellona Reefs, New Caledonian part of the Coral Sea, EBISCO, Stn CP2552, 21°05 S, 158°33 E, 723–741 m, MNHN-IM-2007-33873. One paratype: same locality as holotype, MNHN-IM-2007-33951. <i>Material examined</i>: Type material and other material (MNHN-IM-2007-32453, MNHN-IM-2007-33839, MNHN-IM-2007-33889, MNHN-IM-2007-34205, MNHN-IM-2007-35554, MNHN-IM-2013-45965, MNHN-IM-2013-58395 and MNHN-IM-2013-66983). <i>Etymology</i>: After Melanesia, the subregion of Oceania that includes the general area of occurrence of the species. <i>ZooBank registration</i>: urn:lsid:zoobank.org:act: BDF85F1B-32C3-47A0-B7CE-3D524B483EDF. <i>COI-based diagnosis</i>: Six diagnostic (autapomorphic) positions in the alignment: 22(T), 175(G), 205(C), 266(C), 478(C) and 580(C). <i>Shell (data for holotype shown within parentheses)</i>: Size small to medium for the genus: length 4.5–8 (6.6) mm, width 2.5–5.04 (4.5) mm, height 1.5–3 (2.4) mm; thin, ellipsoidal, depressed; white shell surface with smooth yellowish periostracum; anterior margin rounded or slightly angled; protoconch of 1.1–1.2 (1.1) whorls, diameter of nucleus 0.09–0.15 (0.09) mm; teleoconch smooth except for distinct commarginal growth ridges; apertural margin thin, interior glossy white; lamella from wide to narrow, width 0.34–1.03 (0.68) mm. <i>Soft parts (ethanol preserved)</i>: Head and cephalic tentacles range from completely whitish to dark grey at the base; pseudoproboscis and foot whitish; mantle completely whitish or grey with whitish border. <i>Radula</i>: Taenioglossate, 2-1-R-1-2; marginal teeth sickle shaped; lateral teeth triangular, denticulated only on inner edge or on both edges; rachidian tooth triangular, denticulated on both edges. <i>Host</i>: As indicated in field notes, the holotype and paratype were attached to two individuals of <i>P. investigatoris</i> (MNHN-IM-2007-33874 and MNHN-IM-2007-32441, respectively). One specimen (MNHN-IM-2007-33951) was also found attached to <i>P. sibogai</i> (MNHN-IM-2007-33954); another specimen (MNHN-IM-2007-33839) from the same station and some specimens of <i>P. investigatoris</i> (MNHN-IM-2007-33838) bear consecutive registration numbers (the scallop also showed a mark on the shell, which corresponds to the contour of the <i>Hyalorisia</i> specimen). Two other specimens (MNHN-IM-2013-45965 and MNHN-IM-2013-58395) were found at stations where the only propeamussiid collected was <i>P. investigatoris</i>. <i>Distribution</i>: So far known from New Caledonia, the Solomon Islands and Papua New Guinea, at depths of 447– 741 m. <i>Remarks</i>: <i>Hyalorisia melanesica</i> n. sp. was found sympatrically with three other species of <i>Hyalorisia</i>: with <i>H. tosaensis</i> (MOTU-3) in New Ireland and Papua New Guinea; with <i>H. nupta</i> n. sp. (MOTU-4) in the Coral Sea; and with <i>H. solomonensis</i> n. sp. (MOTU-11) in Ainto Bay, New Britain, Papua New Guinea (Solomon Sea).
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 416-417, DOI: 10.1093/mollus/eyaa028, http://zenodo.org/record/4464900