Strobiligera sp. B

Fernandes, Maurício Romulo, 2024, The deep-sea species of Triphoridae (Gastropoda, Triphoroidea) from Guadeloupe, sampled by the Karubenthos 2 expedition, European Journal of Taxonomy 972, pp. 1-52 : 33

Strobiligera sp. B

Fig. 16H–J

Material examined

GUADELOUPE (Karubenthos 2 expedition) • 1 sh; stn DW4550; MNHN.

Description

Shell sinistral, conical, single complete shell up to 9.9 mm long and 2.0 mm wide, length/width ratio 4.8; apical angle of early whorls 17°. Protoconch paucispiral, 2.75 convex whorls, 0.85 mm long, 0.69 mm wide; first whorl dome-shaped, globose, mainly smooth but apparently with a few, minute pustules; subsequent whorls with two spiral cords, situated at 31% and 61% of whorl height, in addition to a much smaller subsutural cord; no axial sculpture. Teleoconch with up to 12 whorls; three main spiral cords, continuous with those of protoconch; adapical spiral cord very narrow and gradually enlarges through teleoconch, but never reaches same size as other cords; shallow suture, almost indistinct, with a smooth sutural cord; 19 slightly opisthocline axial ribs on 11 th whorl; moderately large, rounded to slightly elliptical nodules; wide, smooth subperipheral cord, one smooth, very narrow basal cordlet, situated right below subperipheral one; no evident supranumerical cords; elliptical aperture, 1.18 mm long, 0.93 mm wide, length/width ratio 1.3; open, short anterior canal, 0.41 mm long, 0.42 mm wide, length/width ratio 1.0. Protoconch beige, teleoconch white.

Remarks

The protoconch size of Strobiligera sp. B falls within the range of S. dinea from Guadeloupe, and the adult shell of Strobiligera sp. B has a similar length (9.9 mm) to small adults of S dinea (at least 11.1 mm). The beige protoconch of Strobiligera sp. B , apparently with minute pustules (but smooth and white in S. dinea ), differentiates them. More material is needed to confirm these differences.

Strobiligera sp. B is also similar to S. cupella sp. nov., but the former has a small adult shell (reaching 9.9 mm in length vs up to 15.8 mm long in incomplete shells of S. cupella ), the adapical spiral cord on the teleoconch is slightly more developed, and the protoconch is slightly elevated and larger (0.85 mm long, 0.69 mm wide vs 0.54–0.64 mm long, 0.49–0.52 mm wide in S. cupella ).

Geographic distribution

Guadeloupe.

Bathymetric distribution

432–482 m (empty shell).

Figures

Fig. 16. A–G. Strobiligera cupella sp. nov. A–B. Holotype, MNHN-IM-2000-38793, 15.8 mm. C. Paratype, MNHN-IM-2000-38794, 8.2 mm. D. Paratype, MNHN-IM-2000-38795, 8.3 mm. E–G. Paratypes, MNHN-IM-2000-38796, 11.5 mm, 10.8 mm. H–J. Strobiligera sp. B, MNHN, stn DW4550, 9.9 mm. Scale bars: A, C–F, H = 1 mm; B, G, I–J = 500 µm.