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

Leucosyrinx legalli sp. nov. urn:lsid:zoobank.org:act: 588504FF-AD5E-42F3-9D3C-925CF7729B2C Figs 5G–H, 8G–K Etymology The species is named after Michel Le Gall, an indespensible volunteer companion of many years of the MNHN expeditions. Material examined Holotype (sequenced) MADAGASCAR • off Majunga; 15°25′ S, 45°55′ E; depth 943–950 m; MIRIKY, stn CP3253; MNHN-IM-2009-16915. Other material (sequenced) MADAGASCAR • 1 lv; off Majunga; 15°22′ S, 45°58′ E; depth 650–850 m; MIRIKY, stn CP3252; MNHN-IM-2009-16912. Description MEASUREMENTS (holotype). SL 30.2 mm, AL (with canal) 14.1 mm, AL (without canal) 8.5 mm, SW 9.0 mm. SHELL (holotype). Medium-sized, thin, fusiform, slender, with high spire, uniformly light tan in color. 9.75 weakly roundly angled at shoulder teleoconch whorls, with slightly concave subsutural ramp. Paucispiral protoconch of about 1.5 evenly rounded whorls. Protoconch and first teleoconch whorls eroded, protoconch–teleoconch transition indistinct. Very shallow, impressed, and slightly wavy suture. 13 weak, oblique, narrow, and rounded axial folds on shoulder of last whorl and 13 on penultimate whorl. Folds fade on subsutural ramp, hardly reach lower suture on penultimate whorl, hardly discernible below shoulder of last whorl. Folds better pronounced and closer spaced on upper whorls, with intervals of about same width as folds, on penultimate and last whorls intervals about twice as broad than folds. Medium distinct spiral sculpture of low, rounded, and narrow cords over entire shell, 6–7 cords on subsutural ramp of last and penultimate whorls, on upper whorls subsutural ramp smooth. Numerous thin, prominent on subsutural ramp growth lines. Shell base weakly curving, smooth transition to long, straight rather broad canal. canal. Narrow, elongate-oval aperture, poorly differentiated from canal, outer lip broken. Inner lip slightly convex. Columellar and parietal sides with narrow, distinct callus, slightly lighter than remaining part of last whorl. Moderately deep, subsutural, broadly arcuate anal sinus extends across subsutural ramp, confluent with large forward extension of outer lip. RADULA (Fig. 5G–H; examined in MNHN-IM-2009-16912). Marginal teeth duplex, ~240 µm (3.0% AL without canal). Major limb lanceolate in dorsal view, weakly curved, with sharp cutting edges of tip (Fig. 5G). Accessory limb constitutes about half of tooth width, ~0.75 of total tooth length, inserted into very shallow socket on dorsal side of major limb. DNA diagnosis (based on 2 cox 1 sequences) ‘A’ in site 202, ‘G’ in site 355, ‘C’ in site 359, ‘T’ in site 478. Remarks The species is sympatric at one station with L. derzellei sp. nov. and is morphologically most close to it (but not phylogenetically). It differs in less angular whorls, a slenderer shell and a relatively taller last whorl. Distribution North-western Madagascar, 650– 943 m.