Hyalorisia lehibe Fassio, Bouchet & Oliverio,

Fassio, Giulia, Russini, Valeria, Buge, Barbara, Schiaparelli, Stefano, Modica, Maria Vittoria, Bouchet, Philippe & Oliverio, Ma, 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, Journal of Molluscan Studies (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) 86 (4), pp. 401-421: 415

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http://doi.org/ 10.1093/mollus/eyaa028

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scientific name

Hyalorisia lehibe Fassio, Bouchet & Oliverio

new species

Hyalorisia lehibe Fassio, Bouchet & Oliverio  new species

MOTU-5 ( Figs 3EView Figure 3, 5AView Figure 5)

Type material: Holotype: off Mahajanga, NW Madagascar, MIRIKY, Stn CP3253 , 15°25 S, 45°55 E, 943–950 m, MNHN-IM-2007-39212.GoogleMaps  One paratype: same locality as holotype, MNHN-IM-2007-39206.GoogleMaps 

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).