Diplommatina tetragonostoma Möllendorff, 1897

Hausdorf, Bernhard, 2017, Revision of the Diplommatinidae (Gastropoda: Cyclophoroidea) from Java, Zootaxa 4312 (2), pp. 201-245 : 221

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.

Figures

FIGURES 10 – 14. DiStribution of Diplommatinidae in JaVa. 10. Diplommatina planicollis Möllendorff, 1897, Diplommatina heteroglypha Van Benthem Jutting, 1948 and Diplommatina javana Möllendorff, 1897. 11. Diplommatina halimunensis n. sp., Diplommatina kakenca n. sp. and Diplommatina heryantoi n. sp. 12. Diplommatina perpusilla Möllendorff, 1897 and Diplommatina ristiae n. sp. 13. Diplommatina sulcicollis Möllendorff, 1897 and Diplommatina cyclostoma Möllendorff, 1897. 14. Diplommatina calcarata Möllendorff, 1897 and Diplommatina tetragonostoma Möllendorff, 1897.

FIGURES 29 – 32. Diplommatina Spp. from JaVa. 29. Diplommatina perpusilla Möllendorff, 1897, JaVa (lectotype SMF 105210). 30. Diplommatina ristiae n. sp., Central JaVa: Donorejo Village, near Seplawan CaVe, KaligeSing, Purworejo (holotype MZB 18886). 31. Diplommatina calcarata Möllendorff, 1897, JaVa (lectotype SMF 105207). 32. Diplommatina tetragonostoma Möllendorff, 1897, WeSt JaVa: Bandung, Mt. Wayang (holotype SMF 105199). Scale bar = 1.0 mm.