Turridrupa astricta ( Reeve, 1843 )

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 : 25-27

Turridrupa astricta ( Reeve, 1843)

( Figs. 9 A–G , 22 G–H )

Pleurotoma interrupta G. B. Sowerby I, 1834 , non Pleurotoma interrupta Lamarck, 1816: 138 . Type loc.: Annaa Island (Chain Island) [= Anaa, Tuamotu Archipelago].

Pleurotoma astricta Reeve, 1843 : pl. 12, sp. 98 (substitute name for P. interrupta ).

Turridrupa astricta ; Oyama & Takemura, 1960, Cernohorsky, 1978: 152, pl. 54, fig. 5, Severns 2011: 384, fig. 4, Boutet et al. 2020: 457, unnumbered fig.

Turridrupa astricta astricta ; Powell, 1967: 417, pl. 305, fig. 4.

Type material

LECTOTYPE (designated by Powell 1967): 13.6 mm ( NHMUK 1963806 , Figs. 9 A–C ), one paralectotype ( NHMUK 1963807 ).

Sequenced material

FRENCH POLYNESIA: Society Islands , Moorea, Afareitu, S. of Ferry Pass, 15–25 m, 17.5294°S, 149.7619°E ( UF 447633 , Fig. 9 E ).— HAWAII: French Frigate Shoals, lagoon, patch reef, 19 m, 23.8202° N, 166.3293° W ( UF 413870 , Fig. 9 D ).

Material examined

MICRONESIA: Marshall Islands, Kwajalein Atoll, Oceanside west reef, in ledge at 15 m, 2 spms ( PS- 444)— Mariana Islands, Guam, Orotept, Orote Cliffs, under a pile of rocks, 15 m, 4 spms ( ANSP 358200).— FRENCH POLYNESIA: MUSORSTOM 9: Stn DR1200, 1 spm (MNHN-IM-2014-832)—Stn DR1297, 1 spm (MNHN-IM-2014-833)— Marquesas, South Coast of Nuku Niva, 15–25 m, coll. by. F. Lorenz, 2 spms ( PS- 445).— HAWAII: Oahu, in cave at 20 m, 1 spm ( PS- 447).

Distribution

The species is known from the eastern Central Pacific ( Micronesia, French Polynesia, and Hawaii) and is recorded from depths between 15 and 150 m.

Description

Shell rather small, up to 14.0 mm in height; slender claviform shaped, with 7 to 8 teleoconch whorls, spire twice height of the aperture including canal; suture very shallow; siphonal canal fairly short, bent slightly to right; anal sinus moderately deep, U-shaped, at the termination of the middle spiral cord; parietal callus-pad well developed; interior of lip with about 7–10 fine spiral threads; lip preceded by a low, broadly convex varix, stromboid notch low and wide.

Sculpture of narrow spiral cords, with sloping sides, 3 on spire whorls, increasing to 4 on penultimate whorl, almost equal in strength (sinus cord sometimes slightly stronger); sinus cord often gemmulated, other cords may also show weak gemmules; last whorl with about 11 primary spiral cords, intervals between cords with 1–5 fine spiral threads; no axial sculpture.

Protoconch domed, with about 4 convex whorls, all except first with arcuate opisthocline axial riblets.

Colour pale brown to bright yellowish buff, sinus cord paler with elongate orange-brown spots (in some specimens also on the third spiral cord).

Radula ( Figs. 22 G–H ) ~60 rows of teeth, including 20 nascent rows; length ~1.9 mm. Central formation has three elements: narrow rhomboid central cusp (length/width ~5.5) and irregular trapezoid lateral elements. Lateral elements with indistinct anterior margin, broadest posterior margin. In some rows, lateral elements closely spaced and fused with central cusp; in others, they remain separate ( Fig. 2H ). Marginal teeth ~95 µm long (1.8% AL). Major limb broad.Accessory limb narrow anteriorly, broadens sharply to ~half the width of major limb. Length ~0.8 of major limb, significantly extends beyond outer limit of major limb.

Remarks

Turridrupa astricta is most similar to Turridrupa consobrina Powell, 1967 which was described as “a North Pacific subspecies” of T. astricta ( Reeve, 1843) . The latter, however, differs in the stronger sinus cord (compared to the other spiral cords), the less crenulated sinus cord, a slightly different protoconch (more convex whorls and less denser axial riblets), and a different colour pattern. Moreover, the molecular analysis clearly differentiates both species.

The colour pattern and the truncated anterior end resembles Lophiotoma abbreviata , but the sinus in that genus is a deep narrow slit and its associated spiral cord is bifid with a concavity in the middle.

Figures

FIGURE 2. Turridrupa acutigemmata (E.A. Smith, 1877): A–C. Holotype, 20.7 mm, locality unknown, NHMUK 1963856; D. 17.9 mm, South Africa, Richards Bay, ex pisce, PS-077; E. Sequenced specimen, 17.0 mm, Papua New Guinea, PAPUA NIUGINI, Stn. PD48, MNHN-IM-2013-15223; F–H. ESEM voucher (G: protoconch, H. penultimate whorl), 14.8 mm, New Caledonia, LAGON, Stn. DW604, MNHN-IM-2014-205; I. Radula voucher, 21.9 mm, New Caledonia, Stn. DW347, MNHN- IM-2014-206. Shells at the same scale. Scale bars for ESEM scans: G: 500 µm, H:1 mm.

FIGURE 9. Turidrupa astricta (Reeve, 1843): A–C. Lectotype, 13.6 mm, French Polynesia, Tuamotu Archipelago, Anaa, NHMUK 1963806; D. Sequenced specimen, 13.6 mm, Hawaii, French Frigate Shoals, 62 feet, UF 456593; E. Sequenced specimen, 9.9 mm, French Polynesia, Society Islands, Moorea, Afareitu, 15–25 m, UF 447633; F-G. ESEM voucher (G: protoconch), 11.5 mm, French Polynesia, Marquesas, S. Nuku Hiva, 5–25 m, PS-445. Turridrupa gourgueti sp. nov.: H–J. Holotype, 12.0 mm, French Polynesia, Society Islands, Tahiti, Baie Phaëton, 0–35 m, MNHN-IM-2000-30418; K. Paratype 1, 11.2 mm, type locality, PS-618; L–M. ESEM voucher (M: protoconch), 11.5 mm, French Polynesia, Society Islands, Tahiti, Paea, MNHN-IM-2000-30432. All shells at the same scale. Scale bars: G, M: 500 µm.

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.