Turridrupa elongata Stahlschmidt, Puillandre, Olivera & Kantor, 2025

Stahlschmidt, Peter, Kantor, Yuri I., Zuccon, Dario, Olivera, Baldomero M. & Puillandre, Nicolas, 2025, Revision of the genus Turridrupa (Gastropoda, Turridae) with description of 15 new species, Zootaxa 5708 (1), pp. 1-66 : 41

Turridrupa elongata Stahlschmidt, Puillandre, Olivera & Kantor sp. nov.

( Figs. 14 A–H , 23 C )

Type material

HOLOTYPE: Papua New Guinea, PAPUA NIUGINI, Stn. PR 110, 05°12,3'S, 145°48,8'E, 40 m, 16.2 mm ( MNHN- IM-2013-15542, Figs. 14 A–C ).

PARATYPE 1: Papua New Guinea, PAPUA NIUGINI, Stn. PR 48, 05°07,2'S, 145°49,4'E, 11.7 mm (MNHN-IM-2013-3038, Figs. 14 E–G ) .

PARATYPE 2: PHILIPPINES, Cebu, North Mactan , 20–60 m, by lumun-lumun net ( PS-1085 , Fig. 14 H ) .

Sequenced material

MADAGASCAR: ATIMO VATAE: TB06 (MNHN-IM-2009-14774; MNHN-IM-2009-14875).— PHILIPPINES: PANGLAO 2004: Stn S 12 (MNHN-IM-2007-17859).— PAPUA NIUGINI: Stn PB 02 (MNHN-IM-2013-10231)— Stn PB 14 (MNHN-IM-2013-11791)— Stn. PR 48 (MNHN-IM-2013-3038, Paratype 1)— Stn PR 110 (MNHN-IM-2013-15542; Holotype)— Stn PS07 (MNHN-IM-2013-1054)—Stn PS09 (MNHN-IM-2013-1417)—Stn PS26 (MNHN-IM-2013-14845) .— NEW CALEDONIA: KOUMAC 2.3: Stn KL 39 (MNHN-IM-2019-8410)— Stn KS 518 (MNHN-IM-2019-9762) .

Distribution

The species is known from southern Madagascar to the Philippines and Papua New Guinea in the western Pacific, in depths between 4 and 60 m.

Description

Shell medium-sized for genus, up to 18.0 mm in height; elongate-claviform, spire twice or slightly more than twice the height of the aperture including canal; suture very shallow; siphonal canal very short, tapering, very slightly oblique and shallowly notched, forming a slight fasciole; anal sinus moderately deep, U-shaped, its apex on the second spiral cord; parietal callus-pad well developed; interior of lip with about 5 well-developed spiral threads; lip preceded by a low, indistinct convex varix.

Spire sculpture of strong, sharply raised, narrow spiral cords, 3 on spire whorls, occasionally increasing to 4 on late teleoconch whorls (the upper suture is formed right on the fourth cord of the previous whorl), almost equal in strength but the sinus cord being slightly stronger; sinus cord often broadly undulating other cords may also show weak gemmules; base of last whorl with 5 additional spiral cords; intervals between cords almost smooth, occasionally with very fine microscopic spiral threads.

Protoconch domed, of about 3.5 whorls, last 2 whorlswith arcuate opisthocline axial riblets; the tip being creamish-white tinged, gradually becoming darker, with the last 1.5 whorl having the same dark colouration as teleoconch.

Colour dark chocolate brown to almost black, with whitish-grey spiral cords.

Radula ( Fig. 23 C ) ~37 rows of teeth, including 19 nascent rows; length ~1.8 mm. Central formation resembles an integral tooth with indistinct anterior margin, slightly elevated straight posterior margin, and sharp, narrow central cusp (length/width ~5.5). Marginal teeth ~130 µm long (2.8% AL), relatively very long. Major limb medium broad, with shallow socket for accessory limb insertion. Accessory limb narrow, gradually broadens toward outer margin, width ~half that of major limb. Length ~0.9 of major limb, strongly extends beyond outer limit of major limb.

Remarks

Turridrupa elongata sp. nov. is very similar to Turridrupa bijubata ( Reeve, 1843) but differs in the more elongate shells, the proportionally higher spire, the shorter and less constricted siphonal canal, the slightly finer spiral cords as well as the much finer spiral threads in the interspaces, the different colouration (darker ground colour, paler spiral cords) as well as the different colouration of the protoconch (in T. bijubata the protoconch is whitish coloured while in T. elongata there is a transition from whitish to dark brown). Moreover, the molecular analyses confirm that these are two different species.

Etymology

In reference to the slender shape of the shell compared to the similar species Turridrupa bijubata .

Figures

FIGURE 14. Turridrupa elongata sp. nov. A–C. Holotype (sequenced), 16.2 mm, Papua New Guinea, PAPUA NIUGINI, Stn. PR110, MNHN-IM-2013-15542; D. 15.2 mm, Madagascar, ATIMO VATAE, Stn. TB6, MNHN-IM-2009-14774; E–G. Paratype 1 (sequenced, radula voucher), 11.7 mm, Papua New Guinea, PAPUA NIUGINU, Stn. PR48, MNHN-IM-2013-3038; H. Paratype 2, Philippines, Mactan Island, 15.6 mm, PS-1085. Turridrupa cf. elongata (cluster 2): I. Sequenced specimen, 10.6 mm, SANTO, Stn. ZS19, MNHN-IM-2007-41300. All shells at the same scale.

FIGURE 23. Radulae of Turridrupa species. A. T. consobrina, New Caledonia, MONTROUZIER, Stn. 1312; B. T. bijubata, New Caledonia, Isle des Pins, 2 m, C. T. elongata sp. nov., Paratype 1 Papua New Guinea, PAPUA NIUGINI, Stn. PR48; D. T. polynesia sp. nov., Society Islands, UF428006; E–F. Turridrupa cincta, Madagascar, ATIMO VATAE, Stn. TA01; G–H. Turridrupa cincta, New Caledonia, MONTROUZIER, Stn. 1240.