Leucosyrinx maestratii Kantor, Fedosov & Puillandre, 2025, sp. nov.

Leucosyrinx maestratii sp. nov. urn:lsid:zoobank.org:act: 7C037EBD-C401-4D3D-939F-D101B59497DD Fig. 25G–J Etymology The species is named after Philippe Maestrati, a long standing member of the MNHN malacological team, in recognition of his outstanding contribution to collecting, curating and managing the molluscan collection of MNHN. Material examined Holotype (sequenced) SOLOMON ISLANDS • NW Santa Isabel I.; 7°49′ S, 157°41′ E; depth 1045–1118 m; SALOMON 2, stn CP2217; MNHN-IM-2009-16770. Other material (sequenced) SOLOMON ISLANDS • 1 lv; 7°38′ S, 156°59′ E; depth 970–1060 m; SALOMON 2, stn CP2270; MNHN-IM-2009-16789. Description MEASUREMENTS (holotype). SL 22.8 mm, AL (with canal) 11.1 mm, AL (without canal) 7.3 mm, SW 8.1 mm. SHELL (holotype). Shell small, thin, fragile, biconical, with high spire, very light-yellowish, nearly white. Paucispiral light orange, small, bulbous, microshagreened, strongly eroded protoconch. Protoconch-teleoconch transition non discernible due to erosion. About 8.5 strongly roundly angled at shoulder teleoconch whorls, strongly concave on all whorls subsutural ramp. Distinct impressed suture. 15–16 strong, oblique axial folds, on last and penultimate whorls. Folds fade on subsutural ramp, reaching lower suture, extend to shell base. Intervals between folds equal or narrower than folds’ width on last and penultimate whorls. Very distinct spiral sculpture of similar in width, low, slightly wavy cords over entire shell, distinct on shoulder, covering also axial folds. Intervals between cords are narrower than cords’ width and only between few cords intervals equal to cords’ width. Cords distinct on subsutural ramp, slightly vary in width, 8 cords on subsutural ramp of last and penultimate whorls. Numerous thin and indistinct growth lines. Shell base rounded, medium convex, quickly constricting and passing into medium long, slightly sinuous canal. Narrow, elongate-oval aperture, poorly differentiated from canal, inner lip weakly convex, nearly straight. Columellar and parietal sides with narrow, distinct white callus. Deep, subsutural, broadly arcuate anal sinus extends across subsutural ramp, confluent with large forward extension of outer lip. RADULA. Not examined. DNA diagnosis (based on 2 cox 1 sequences) ‘C’ in site 232, ‘G’ in site 382, ‘G’ in site 502, ‘C’ in site 652. Remarks The species is very similar to L. modicae sp. nov., which nevertheless attains a larger size (up to 31.8 mm vs 24 mm in L. maestratii sp. nov.). The new species differs in more closely spaced axial folds and relatively broader spiral cords below shoulder, similar in width to those on the subsutural ramp. In the holotype, the number of cords on the last whorl below the subsutural ramp is 44, while in the similarlysized specimen of L. modicae (IM-2013-52093, SL 23.3 mm) the number of cords is 65. The molecular phylogenetic analysis demonstrated that these species are not closely related. Distribution Solomon Is., 970–1045 m.