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

Leucosyrinx ringevali sp. nov. urn:lsid:zoobank.org:act: E4F3F151-D5AB-4B5D-9DAE-618156F6F3A4 Fig. 7A–H Etymology The species is named after Allan Ringeval, member of the ERC “HYPERDIVERSE” team, for his contribution to the knowledge of toxin diversity in neogastropods. Material examined Holotype (sequenced) MADAGASCAR • off Majunga; 15°25′ S, 45°55′ E; depth 943–950 m; MIRIKY, stn CP3253; MNHN-IM-2009-16916. Other material (all sequenced) MADAGASCAR • 2 lv; off Majunga and Cape Saint-André; 15°22′ S, 45°57′ E; depth 780–1020 m; MIRIKY, stn CP3279; MNHN-IM-2007-36693, MNHN-IM-2009-16884 • 1 lv; same data as for holotype; MNHN-IM-2009-16919. Description MEASUREMENTS (holotype, largest specimen). SL 34.2 mm, AL (with canal) 15.5 mm, AL (without canal) 10.4 mm, SW 10.2 mm. SHELL (holotype). Medium-sized, narrow fusiform, with high spire, uniform light tan in color. Slightly over 10 teleoconch whorls. Paucispiral protoconch of about 2 rounded whorls, partially broken. Protoconch–teleoconch transition marked by appearance of axial folds. Teleoconch whorls strongly angled at shoulder, with distinctly concave subsutural ramp. Distinct shallow, impressed, and with wavy edge suture. 14 strong, oblique, broad, rounded axial folds on last whorl and 13 on penultimate whorl. Folds fade on sharply delimitated subsutural ramp, slightly weakening towards lower suture, disappear on whorl periphery. On last half of last whorl folds progressively weakening and not discernible near aperture. Intervals between the folds slightly exceed folds’ width. Medium- to well-developed spiral sculpture of rounded, narrow equally developed cords over entire shell, visible on axial folds and in interspaces between them. 8–9 on subsutural ramp of last and penultimate whorls. Numerous, thin growth lines, prominent on subsutural ramp. Shell base slightly convex, weakly curving, smooth transition to long and straight canal. Narrow, elongate-oval aperture, poorly differentiated from canal. Inner lip nearly straight. Columellar and parietal sides with narrow, distinct callus. Moderately 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 4 cox 1 sequences) ‘C’ in site 290, ‘C’ in site 496, ‘C’ in site 544, ‘T’ in site 605. Remarks Although only four specimens are available, the species demonstrates a rather high variability in shell shape. The holotype is the largest and most slender specimen. The other specimens have broader shells with faster constricting shell base. There is a certain similarity to Leucosyrinx madagascarensis, but the new species differs in a smaller shell and in a more delicate spiral sculpture. The new species is also similar to L. floraecharlottae sp. nov., differing in better pronounced spiral cords on the subsutural ramp and axial folds not extending to the ramp. Both species are not sister to L. ringevali sp. nov. in the phylogenetic tree. Distribution Madagascar, 780– 943 m.