Leucosyrinx paupera (Watson, 1881) comb. nov.

Fig. 33B–D

Pleurotoma (Drillia) paupera Watson, 1881: 411 .

Pleurotoma (Typhlomangelia) paupera – Watson 1886: 317, pl. 25 fig. 3.

Turricula paupera – Powell 1969: 244 (23-238), pl. 202.

Comitas paupera – Sysoev 1996 (part.): 8, figs 42, 45, 48 (non figs 43 = Borsoniidae gen. sp., 44, 46–47 = Leucosyrinx arcana).

Type material

Lectotype INDONESIA • Arafura Sea, Aru I., 5°41′ S, 134°04′30″ E; depth 800 ftm (= 1463 m); HMS Challenger, stn 191; NHMUK 1887.2.9.1009.

Paralectotypes

INDONESIA • 2 specs; same data as for lectotype: NHMUK 1887.2.9.1010, 1887.2.9.1011 .

Remarks

As evident from the synonymy, determining the generic position of this species is not straightforward. The type series likely comprises three species. The lectotype (Fig. 32B) was probably first designated by Powell (1969: 244) in the table of measurements. Although the specimen with the SL of 40.1 mm is significantly damaged, we tentatively attribute it to Leucosyrinx based on the general shell shape, sculpture, and position of the anal sinus. The paralectotype NHMUK 1887.2.9.1010 (Fig. 33C, SL 33.3 mm) differs from the lectotype by having much less pronounced axial sculpture, the presence of dendritic spiral threads, and a lower position of the shallow anal sinus, which extends below the limits of the subsutural ramp. Additionally, it shows traces of an obtuse columellar fold, and the inside of the aperture is orange. In our opinion, this specimen may belong to the family Borsoniidae . Finally, the paralectotype NHMUK 1887.2.9.1011 (Fig. 33D, SL 18.5 mm) may be a juvenile specimen of Leucosyrinx arcana .

Distribution

Indonesia, Gulf of Aden, and Gulf of Oman, 1463 – 2000 m.