Leucosyrinx rattiae sp. nov.

urn:lsid:zoobank.org:act: DCD2473D-D65A-4149-84E4-2D059261382A

Figs 5E, 7N–R

Leucosyrinx sp. D – Kantor & Puillandre 2021: fig. 13f.

Etymology

The species is named after Claudia Ratti, member of the ERC “HYPERDIVERSE” team, for her contribution to the management of the neogastropod collection of the 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-2009-16769.

Other material (all sequenced)

SOLOMON ISLANDS • 2 lv; same data as for holotype; MNHN-IM-2009-16767, MNHN-IM-2009-16768.

Description

MEASUREMENTS (holotype). SL 24.9 mm, AL (with canal) 13.0 mm, AL (without canal) 8.4 mm, SW 9.7 mm.

SHELL (holotype). Small, fusiform, nearly biconic, with medium high spire, uniformly light tan in color, fragile. About 8 teleoconch whorls. Paucispiral, smooth, eroded protoconch of less than 1.5 whorls. Teleoconch whorls roundly angled at the shoulder, with a distinctly concave subsutural ramp. Distinct, shallow, impressed, suture with wavy edge. 15 strong, oblique, broad, rounded axial folds on last and penultimate whorls. Folds fade on sharply delimitated subsutural ramp, extending without weakening towards lower suture, disappear on whorl periphery. Folds well-developed on all whorls, intervals between folds slightly broader than folds. Medium- to well-developed spiral sculpture of rounded, narrow equally developed cords over entire shell, including axial folds and interspaces between them. Cords pronounced on subsutural ramp, 5–6 on last and penultimate whorls. Numerous thin, prominent on the subsutural ramp growth lines. Shell base slightly convex, weakly curving, smooth transition to medium 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 (Fig. 5E; studied in MNHN-IM-2009-16768). Marginal teeth duplex, ~230 µm in length, relatively short (3.7% of AL without canal), rather broad and short. Major limb broadly lanceolate in dorsal view, curved. Accessory limb more than twice as narrow, ~0.75 of total tooth length, inserted into distinct deep socket on dorsal side of major limb.

DNA diagnosis (based on 2 cox 1 sequences)

‘T’ in site 307, ‘G’ in site 325, ‘C’ in site 460.

Remarks

The largest second specimen measures SL 28.7 mm, with a relatively longer siphonal canal.

In shell outline the new species resembles several species, particularly L. farhatorum sp. nov. and L. ringevali sp. nov., none being closely related according to the phylogenetic tree. Another similar species is L. herosae sp. nov., from which it differs by the much smaller size and a relatively lower spire.

Distribution

The species is known only from the type locality.