Strobiligera sp. A

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 : 19-21

Strobiligera sp. A

Fig. 10

Material examined

GUADELOUPE (Karubenthos 2 expedition) • 1 sh; stn CP4513; MNHN • 1 sh; stn DW4549; MNHN • 1 sh; stn DW4550; MNHN • 1 sh; stn DW4599; MNHN.

Description

Shell sinistral, conical-fusiform, up to 5.0 mm long, 1.1 mm wide, apical angle of early whorls 14–15°. Protoconch paucispiral, sub-columnar, 3.0–3.25 whorls, 0.59–0.73 mm long, 0.38–0.47 mm wide; small nucleus rises in an adapical direction and further goes abapical in an oblique descent; two main smooth spiral cords, similarly-sized, situated at 37–44% and 71–77% of last whorl height, in addition to a very narrow subsutural cord; gradual transition to teleoconch, from a smooth spiral sculpture to a nodulous one. Teleoconch with up to 11 whorls; three main spiral cords (continuous to those of protoconch), adapical one initially strongly reduced, gradually strengthening and reaching same size as other cords between sixth and eighth whorls; suture shallow, with a very thin sutural cord; 18 orthocline to slightly opisthocline axial ribs on ninth teleoconch whorl; medium-sized, nearly rounded to slightly elliptical nodules; base apparently not fully developed. Shell white.

Remarks

Strobiligera sp. A is currently known from small and often worn shells, of up to 5.0 mm in length, although it is uncertain whether the largest shell ( Fig. 10E ) is adult or juvenile. It differs from S. cf. enopla in the earlier full development of the adapical spiral cord of the teleoconch and in the first protoconch whorl (not slightly inflated, as observed in most shells of S. cf. enopla ). The shell of Strobiligera sp. A is completely white, contrasting with the brown adapical spiral cord in the teleoconch of S. picta sp. nov. Adult shells are required to confirm this as a new species.

Geographic distribution

Guadeloupe.

Bathymetric distribution

262–644 m (empty shells).

Figures

Fig. 10. Strobiligera sp. A. A–B. MNHN, stn CP4513, 2.8 mm. C–D. MNHN, stn DW4549, 4.5 mm. E–F. MNHN, stn DW4550, 5.0 mm. G. MNHN, stn DW4599, 3.1 mm. Scale bars: A, C, E, G = 1 mm; B, D, F = 500 µm.