Hyalorisia madagascarensis 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 madagascarensis

description: <i>Hyalorisia madagascarensis</i> Fassio, Bouchet &amp; Oliverio new species MOTU-10 (Figs 3J, 6B, 7H, Q) <i>Type material</i>: Holotype: off Mahajanga, NW Madagascar, MIRIKY, Stn CP3268, 15°31 S, 45°45 E, 640–800 m, MNHN-IM-2007-39090. <i>Material examined</i>: The holotype and one other specimen (MNHN-IM- 2007-39292). <i>Etymology</i>: After the general area of occurrence, Madagascar. <i>ZooBank registration</i>: urn:lsid:zoobank.org:act: 5D585AFC-B8C7-4639-9535-74CA13427627. <i>COI-based diagnosis</i>: Nine diagnostic (autapomorphic) positions in the alignment: 40(G), 103(C), 158(C), 283(G), 529(C), 553(C), 556(C), 605(T) and 628(G). <i>Shell (data for holotype shown within parentheses)</i>: Size small to medium for genus: length 6.5–11 (6.5) mm, width 4.5–9 (4.5) mm, height 2–3 (2) mm; thin, ellipsoidal or rounded, depressed; white shell surface with smooth yellowish periostracum; anterior margin rounded; protoconch of 0.9 whorl, diameter of nucleus 0.19 mm; teleoconch smooth except for distinct commarginal growth ridges; apertural margin thin, interior glossy white; lamella from wide to narrow, width 0.8–0.92 (0.8) mm. <i>Soft parts (ethanol preserved)</i>: Cephalic tentacles whitish with grey base; pseudoproboscis whitish. <i>Radula</i>: Taenioglossate, 2-1-R-1-2; marginal teeth sickle shaped; internal marginals with a 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 attached to <i>P. caducum</i> (MNHN-IM-2007-39094). The second specimen of this <i>Hyalorisia</i> species (MNHN-IM-2007-39092) has a registration number close to that of a specimen of <i>P. sibogai</i> (MNHN-IM-2007-39097); the latter shows a mark on the shell that corresponds to the contour of the <i>Hyalorisia</i> specimen. <i>Distribution</i>: So far known only from Madagascar, at depths 425– 640 m. <i>Remarks</i>: Off Mahajanga, Madagascar (MIRIKY: Stn CP3268), <i>Hyalorisia madagascarensis</i> n. sp. was found sympatrically with <i>H. lehibe</i> n. sp. (MOTU-5) and syntopically with <i>H. kely</i> n. sp. (MOTU-7).
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 page 417, DOI: 10.1093/mollus/eyaa028, http://zenodo.org/record/4464900