Turridrupa armillata (Reeve, 1845)

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 : 50

Turridrupa armillata (Reeve, 1845)

( Figs. 18 A–J )

Pleurotoma armillata Reeve, 1845 : pl. 21, sp. 176. Type loc.: Philippine Islands.

Turridrupa armillata ; Powell 1967: 416, pl. 302, fig. 2 ( holotype); Stahlschmidt & Fraussen, 2011: figs. 12–13 ( holotype); Poppe 2017: plate 1589, fig. 8.

Type material

HOLOTYPE: 18.3 mm ( NHMUK 1963776 ; Figs. 18 A–B ).

Sequenced material

PAPUA NEW GUINEA: KAVIENG: Stn KB36 (MNHN-IM-2013-53458, Figs. 18 G–J ).

Material examined

PHILIPPINES: PANGLAO 2004: Stn S21, 1 spm (MNHN-IM-2014-160).— Cebu, Mactan Island, ca. 20 m, 1 spm ( PS- 1192).—Mindanao, Talikud, 30 m, 1 spm (Chino-coll.).

Distribution

So far only known from the Philippines and Papua New Guinea, in depths between 3 and 30 m.

Description

Shell medium-sized for genus, up to 18.5 mm in height; somewhat broadly fusiform with about 8 teleoconch whorls, spIrE abouT 1⅓ TIMEs hEIGhT of apErTurE IncludInG sIphonal canal; suTurE dEEplY IndEnTEd, sIphonal canal consTrIcTEd, slightly curved to right, terminally truncate, barely indented, rostrum with slight fasciole and false umbilicus; anal sinus deep, U-shaped, at the termination of the second spiral cord; parietal callus-pad well-developed; interior of lip with about 8 fine spiral threads; stomboid notch wide and shallow, lip preceded by a low, broadly convex varix.

Spire whorls with 3–4 subequal spiral cords (4th cord may be fully visible or barely showing at suture), much narrower than their intervals; subsutural cord smooth, followed by sinus cord with regular, densely-set and compressed gemmules, 20–24 on penultimate whorl; third and 4th cords smooth, equal in width to subsutural cord; base of last whorl with about 10 main spiral ridges, upper ones strong, smooth, widely spaced, those on anterior part closly-set and fine, interstices with a few thin spiral threads.

Protoconch papiliform, of about 1.75 whorls, first whorl smooth, last half with arcuate axial riblets.

Colour white, with a light brown band between subsutural and sinus spiral cord, other spiral cords golden-brown coloured.

Remarks

Turridrupa armillata is similar to Turridrupa poppei Stahlschmidt & Fraussen, 2011 , but differs in the much slenderer and smaller shell, the more numerous and closely-set gemmules, and the completely different shell colouration.

Figures

FIGURE 18. Turridrupa armillata (Reeve, 1845): A–B. Holotype, 18.3 mm, Philippines, NHMUK 1963776; C–E. 16.0 mm, Philippines, Talikud, 30 m, Chino-coll.; F. 13.9 mm, PANGLAO, Stn. S21; G-J. Sequenced specimen, ESEM voucher (J: protoconch), 17.3 mm, Papua New Guinea, KAVIENG 2014, Stn. KB36, MNHN IM-2013-53458. Turridrupa punctolineata sp. nov.: K–M. Holotype, 17.5 mm, Marshall Islands, Kwajalein, 15 m, MNHN-IM-2000-37771; N. Paratype 1, 17.4 mm, Marshall Islands, Kwajalein, 10–14 m, PS-1075. All shells at the same scale. Scale bar for shells 10 mm, for protoconch 500 µm.