Turridrupa weaveri Powell, 1967

(Figs. 20 H–L, 22 C)

Turridrupa weaveri Powell, 1967: Hawaii, Oahu, off Rabbit Island, 14 m; 423, pl. 303, fig. 5; Kay, 1979: 340, figs. 111 I, 113 G.; Severns, 2011: 384, fig. 7, Boutet et al., 2020: 457, unnumbered fig.

Type material

Holotype: 21.6 mm (BPBM, Figs. 20 H–J).

Sequenced material

FRENCH POLYNESIA: Moorea, Vaipahu, -17.4771°, -149.8485°, 60–65 m (UF 456496, Fig. 20 L).

Material examined

PHILIPPINES: Mactan, Punta Engaño, 100–120 m, 1 spm (MNHN-IM-2014-563)— Cebu, Olango Island, 30 m on reef, 1 spm (PS- 205).— NEW CALEDONIA: MONTROUZIER: Stn 1312, 2 spm (MNHN-IM-2014-565; MNHN-IM-2014-741, radula voucher, Fig. 20 K).—LIFOU 2000, Stn 1456, 1 spm (MNHN-IM-2014-564).— HAWAII: Oahu, Ewa Beach, 2–5 m, on coral sand, 1 spm (PS- 204).

Distribution:

Presently known from the Philippines, New Caledonia, French Polynesia (Boutet et al., 2020), and Hawaii, in depths from 2 to 120 m.

Description

Shell medium to large-sized for genus, up to 21.6 mm, claviform shaped with about 9 teleoconch whorls; spire about 1.5 height of the aperture including canal; suture incised and inconspicuous; siphonal canal short and stout, bent slightly to right; anal sinus moderately deep, anal sinus deep, U-shaped, moderately deep, situated on the termination of the second spiral cord; parietal callus-pad strong; interior of lip with about 7 spiral threads; stromboid notch very wide and shallow; lip preceded by an ill-defined, inconspicuous convexity representing a terminal varix.

Spire whorls sculptured with three equally strong spiral cords and a fourth emergent, or half emergent, over the last whorls; sharply angular with sloping sides; sinus cord more or less undulating; third and 4th cords smooth or slightly undulating, no spiral threads in the interspaces; last whorl with about 10 main spiral cords, strong, widely spaced, fine threads mainly in the interspaces between the spirals of the rostrum; no axial sculpture.

Protoconch eroded in all examined specimens, domed, of ca. 2.5 whorls, ca. last 1.5 whorls with strong arcuate axial riblets.

Base of last whorl and about first 3 teleoconch whorls white, remaining area dark brown coloured with white spots placed mainly on the raised parts of the undulating spiral cords.

Radula (Fig. 22 C) short, ~35 rows of teeth, including 8 nascent rows; length ~1.07 mm. Central formation with three elements: very narrow needle-shaped central cusp (length/width ~3.5) and broad, narrow lateral elements resembling transverse folds of a membrane. Marginal teeth ~80 µm long (2% AL). Accessory limb poorly differentiated from major limb, especially along anterior margin, nearly equal in width along length, fuses with dorsal surface of major limb, no socket. Accessory limb ~half the width of major limb. Length ~0.6 of major limb, reaches outer limit of major limb.

Remarks

Turridrupa weaveri Powell, 1967 is only remotely similar to Turridrupa erythraea (Weinkauff, 1875) by the claviform and similar sized shell and the only slightly undulating spiral sinus cords, but is easy to tell apart by its characteristic colour pattern and by the missing of the threads in the interspaces of the spiral cords (all above on the spire whorls).