Turridrupa granulata 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 : 28-30

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

( Figs. 10 A–F , 22 A–B )

Type material

HOLOTYPE: New Caledonia, SMIB 8 , Stn DW154 , Norfolk Ridge , Mont Kaimon Maru , 24°46'S, 168°08'E, 235– 252 m, 10.5 mm ( MNHN-IM- 2000-30414; Figs. 10 A–C, E–F ).

PARATYPE 1–4: type locality ( MNHN-IM- 2014-737, PS-1066) .

PARATYPE 5: NEW CALEDONIA, BERYX 11 , Stn CP17 , Norfolk Ridge , Mont Kaimon Maru , 24°48'S, 168°00'E, 250–270 m (PS-452 ) .

PARATYPE 6: New Caledonia, NORFOLK 1 , Stn DW1727 , Norfolk Ridge , 23°17'S, 168°14'E, 190–212 m ( MNHN-IM- 2000-30415, radula voucher, Figs. 10 D ) .

Material examined

NEW CALEDONIA: SMIB 3: Stn DW8, 1 spm (MNHN-IM-2014-732).—SMIB 8: Stn DW159, 5 spms ( MNHN- IM-2014-738).—CHALCAL 2: Stn DW71, 2 spms (MNHN-IM-2014-733).—BIOCAL: Stn DW64, 4 spms (MNHN-IM-2014-734)—BERYX 11: Stn DW18, 6 spms (MNHN-IM-2014-735).—NORFOLK 2: Stn DW2123, 1 spm (MNHN-IM-2014-736)—Stn DW2124, 1 spm (MNHN-IM-2014-739).

Distribution

So far only known from the seamountains “Kaimon Maru”, “Crypthelia”, and “P”, all situated on the Norfolk Ridge, south of New Caledonia.

Description

Shell small-sized for genus, up to 10.7 mm in height; biconic claviform in shape with about 6–7 teleoconch whorls, spire about 1.5 times height of aperture including siphonal canal; suture slightly incised; siphonal canal very short, barely indented, rostrum with slight fasciole; anal sinus moderately deep, U-shaped, evenly rounded, at the termination of the second spiral cord; parietal callus-pad moderately strong; stromboid notch very shallow, lip preceded by a high and broadly convex varix.

Spire whorls with 4 spiral cords which are narrower than their intervals; strong subsutural cord, followed by the sinus cord and peripheral cord which are elevated in the whorl and descend towards the lower suture to a fourth somewhat weaker spire cord; in earlier spire whorls the peripheral cord is by far the strongest, but in the last two largest whorls the strength of the sinus cord and the peripheral cord are roughly equivalent; sinus cord with densely set knobs (about 27 on penultimate whorl), while the other cords have less and more laterally elliptical and shallow gemmules, stronger developed on peripheral cord (about 13 on penultimate whorl); interspaces of spire whorls without spiral threads, but fine axial lines; last whorl occasionally with secondary spiral threads. Base of last whorl with about 5 spiral cords.

Protoconch papiliform, about 1.3 whorls, smooth, except last third with faint arcuate opisthocline axial riblets.

Background colouration varies from whitish to light golden brown with irregularly distributed darker brown blotches or spots and in most specimens with a golden brown band on the base. In some specimens there are golden brown spots situated in the interspaces of the gemmules. Protoconch white tinged.

Radula ( Figs. 22 A–B ) ~35 rows of teeth, including 19 nascent rows; length ~1.05 mm. Central formation morphology unclear due to preservation; cusp and lateral elements appear fused. Central cusp weak and short ( Fig. 21 B ). Marginal teeth ~80 µm long (2% AL). Major limb narrow. Accessory limb narrow, uniform in width, fuses with dorsal surface of major limb, no socket. Width ~half that of major limb. Length ~0.6 of major limb, nearly reaches outer limit of major limb.

Remarks

Turridrupa granulata sp. nov. remotely resembles T. imitiata sp. nov. but differs in the smaller size and the different shape (less fusiform) due to the much shorter siphonal canal.

Ethymology

The name refers to the densely set gemmules on the spiral cords, resulting in the granulated shell surface (from Latin granulum “granule”).

Figures

FIGURE 10. Turridrupa granulata sp. nov.: A–C. Holotype, 10.5 mm, New Caledonia, SMIB 8, Stn. DW154, MNHN-IM- 2000-30414; D. Paratype 6, radula voucher, 10.7 mm, New Caledonia, NORFOLK 1, Stn. DW1727), MNHN-IM-2000 30415; E–F. Holotype, ESEM scans of protoconch and penultimate whorl. Turridrupa virginiae sp. nov.: G-I. Holotype, 17.8 mm, New Caledonia, CONCALIS, Stn. DW2974, MNHN-IM-2000-30416; J. Paratype 1, 14.9 mm, New Caledonia, MUSORSTOM 6, Stn. DW398, 370 m, MNHN-IM-2000-30417.A-D, G-J – at the same scale.

FIGURE 21. Radulae of Turridrupa species: A. T. acutigemmata, New Caledonia, LAGON, Stn. DW347, SL 22.0 mm, AL 5.9 mm; B. T. neojubata sp. nov., New Caledonia, LIFOU 2000, Stn. 1464; C, D. T. jubata, New Caledonia, LAGON, Stn. DW808; E–F. T. maestratii sp. nov., Paratype 1, New Caledonia, BATHUS 4, Stn. DW942; G–H. T. pallurae, LAGON, Stn. DW1148.

FIGURE 22. Radulae of Turridrupa species: A–B. T. granulata sp. nov., New Caledonia, NORFOLK 1, Stn. DW1727; C. T. weaveri, New Caledonia, MONTROUZIER, Stn. 1312; D. T. albofasciata, New Caledonia, LIFOU 2000, Stn. 1453; E–F. T. erythraea, Egypt, Brothers Islands, 15–25 m, SMF 346016; G–H. T. astricta, Moorea, UF 456593.