Leucosyrinx lozoueti, Kantor & Fedosov & Puillandre, 2025

Kantor, Yuri I., Fedosov, Alexander & Puillandre, Nicolas, 2025, Revision of the Indo-Pacific species of the genus Leucosyrinx Dall, 1889 (Neogastropoda: Conoidea: Pseudomelatomidae), European Journal of Taxonomy 999, pp. 1-126 : 83-84

Leucosyrinx lozoueti sp. nov.

urn:lsid:zoobank.org:act:1B0E60BD-7739-4FC1-A42C-A3919160655E

Figs 28A–G , 29A

Etymology

The species is named after Pierre Lozouet from MNHN, world known expert on Recent and fossil molluscs and responsible for the marine invertebrate collection of the MNHN.

Material examined

Holotype (sequenced)

NEW CALEDONIA • SW of Ile des Pins ; 22°53′ S, 167°17′ E; depth 530–545 m; KANACONO, stn DW4666; MNHN-IM-2013-68662.

Other material (sequenced)

NEW CALEDONIA • 2 lv; same data as for holotype; MNHN-IM-2013-68075, MNHN-IM-2013-68076 .

Description

MEASUREMENTS (holotype). SL 9.2 mm, AL (with canal) 4.7 mm, AL (without canal) 3.3 mm, SW 3.4 mm.

SHELL (holotype). Shell small, slender, fusiform, with high spire, very light tan, thin, glossy. Small paucispiral protoconch, of about 1.75 smooth, bulbous, light-brown whorls. Protoconch-teleoconch transition hardly discernible, marked by appearance of definitive sculpture. Slightly over 4.5 distinctly angular on shoulder teleoconch whorls, subsutural ramp evenly strongly concave on all whorls. Distinct impressed suture. 14–15 strong, slightly oblique, dense axial folds on and shortly below shoulder on last and penultimate whorls. Folds reach lower suture on teleoconch whorls, gradually diminish on last whorl towards aperture, although still present. Well-developed spiral sculpture of similar width, narrow, low, rounded, wavy cords over entire shell, including subsutural ramp. 5 slightly broader cords below suture on last whorl and 4 on penultimate one, about 30 wavy cords below shoulder on last whorl. Intervals between cords narrower than cords’ width in most cases. Shell base weakly convex, slowly passing in medium long straight canal. Narrow-oval aperture well differentiated from canal. Columellar and parietal callus well-developed, of same color as remaining shell. Medium deep, subsutural, broadly arcuate anal sinus extends across subsutural ramp, confluent with large forward extension of outer lip.

RADULA ( Fig. 29A ; examined in MNHN-IM-2013-68076). Comprising around 32 rows of teeth, 6 nascent. Marginal teeth duplex, ~130 µm in length (5.4% AL without canal). Major limb medium broad lanceolate in dorsal view, weakly curved. Accessory limb about half of tooth width, of the same width along entire length, ~0.7 of total tooth length, inserted into distinct socket on dorsal side of major limb.

DNA diagnosis (based on 3 cox 1 sequences)

‘C’ in site 142, ‘G’ in site 592, ‘T’ in site 625.

Remarks

The species is known from three specimens collected at the same station and exibits moderate variation in shell shape. From similar in size L. nodulocordata sp. nov. it is well differentiated by the spiral sculpture pattern, having much narrower and closer spaced cords.

This is the smallest species of Leucosyrinx , not reaching 10 mm in SL. The only anatomically studied specimen (MNHN-IM-2013-68076) appeared to be a female with a well-developed pallial gonoduct, suggesting that it reached sexual maturity.

Distribution

The species is known from the type locality.

Figures

Fig. 28. A–G. Leucosyrinx lozoueti sp. nov. A–C. Holotype, MNHN-IM-2013-68662, SL 9.2 mm. D–E. MNHN-IM-2013-68075, New Caledonia, SW of Ile des Pins, 530–545 m, SL 9.2 mm. F–G. MNHN-IM-2013-68076, same locality, SL 8.1 mm. H–L. Leucosyrinx nodulocordata sp. nov. H–J. Holotype, MNHN-IM-2013-9752, SL 10.4 mm. K–L. MNHN-IM-2007-42471, Philippines, 356– 396 m, SL 8.8 mm. M. Leucosyrinx sp. 9, MNHN-IM-2013-68714, New Caledonia, SW of Ile des Pins, 530–545 m, SL 5.7 mm. N–O. Leucosyrinx sp. 5, MNHN-IM-2009-17198, Papua New Guinea, 340–358 m, SL 10.8 mm. All shells at the same scale.

Fig. 29. Radulae of species of Leucosyrinx Dall, 1889. A. L. lozoueti sp. nov., MNHN-IM-2013-68076, SL 8.1 mm. B. Leucosyrinx sp. 5, MNHN-IM-2009-17198, SL 10.8 mm. C. L. archibenthalis Powell, 1969, MNHN-IM-2009-13333, SL 36.7 mm. D–E. Leucosyrinx sp. 6, MNHN-IM-2009-6036, SL 15.2 mm. F. L. placaisae sp. nov., MNHN-IM-2013-48112, SL 18.6 mm. Scale bars = 100 µm.