Diplommatina tetragonostoma Möllendorff, 1897

(Figs 14, 32; Table 1)

Diplommatina (Sinica) tetragonostoma Möllendorff, 1897: 96 (JaVa) . Kobelt 1902: 475. Zilch 1953: 37, pl. 13 fig. 190. Diplommatina tetragonostoma — Van Benthem Jutting 1948: 596, fig. 52.

Diagnosis. Diplommatina tetragonostoma is characterized by a distinct narrowing of the last 1.5 whorls, distinct extensions of the peristome, a prominent columellar lamella and moderately widely spaced ribs.

Shell (Fig. 32; Table 1). Dextral; spindle-shaped with conical early whorls and a much narrowed last whorl; with 6.5–6.75 whorls separated by a deep suture; protoconch smooth; teleoconch with moderately widely spaced ribs (31–39 on the penultimate whorl; approximately the same number on the last whorl); without discernible spiral striae between the ribs; light corneous; subtranslucent; last whorl rounded, with a ventrolateral right constriction; aperture subangular, angular at the transition from columellar to basal side; upper insertion of the peristome ascending towards aperture; insertions of the peristome connected by a distinct callus; peristome distinctly expanded, with 2–4 blunt processes, of which the upper palatal and the columellar-basal are strongest, thickened, doubled; aperture with a prominent columellar lamella; with a short spiral palatal fold in the middle of the whorl ventrally inside the last whorl and with an indistinct radial palatal fold ventrolaterally right; umbilicus closed. Shell height 2.5–2.9 mm, shell diameter 1.4–1.65 mm.

Remarks. Diplommatina tetragonostoma is most similar to D. calcarata . For a comparison see there.

Habitat. In leaf litter in forests on volcanic soils at 1200–2200 m a.s.l.

Type material. Indonesia, Java, West Java: Bandung, Mt. Wayang, 7°13'S 107°38'E (holotype of D. tetragonostoma SMF 105199).

Other material. Indonesia, Java, West Java: Cianjur, Mt. Gede, 1200m a.s.l., 6°45'S 107°01'E (ZMA 33645/2, vouchers to van Benthem Jutting 1948); West Bandung, Mt. Tilu, 1900 m a.s.l., 7°06'S 107°23'E (SMF 105201 /1, 163050/1); Bandung, Mt. Wayang, 2000 m a.s.l., 7°13'S 107°38'E (SMF 105200 /1); Garut, Mt. Papandayan, forest at Tegal Primula (Tegal Panjang), 2200 m a.s.l., 7°16'S 107°44'E (ZMA 410564 /1)

Distribution (Fig. 14). Diplommatina tetragonostoma is endemic to West Java.