Diplommatina moluccensis Greķe, 2017

Heryanto, Mujiono, Nova, Laitupa, Ibnu Wahab & Nurinsiyah, Ayu Savitri, 2023, Two species of Diplommatina and a new species of Palaina (Gastropoda: Cyclophoroidea: Diplommatinidae) from Moti Island, North Moluccas, Indonesia, Raffles Bulletin of Zoology 71, pp. 331-336 : 333

Diplommatina moluccensis Greķe, 2017

( Figs. 1 , 2a ; Table 1)

Diplommatina moluccensis Greķe, 2017: 181 , pl. 25: fig. 1–5 ( Tidore I., North Moluccas).

Diplommatina sp.1 — Heryanto, 2011: 123.

Material examined. Specimen MZB.Gst. 22495/7, Indonesia, North Moluccas, Moti Island, Tadenas Village, forest near nutmeg plantation, 480 m a.s.l., 0°27′42.7″N 127°25′40.8″E, coll. Heryanto, May 2010; specimen MZB.Gst. 22496/41, Moti Village, 65 m a.s.l., 0°27′42.78″N 127°24′52.47″E, coll. Heryanto, Nova Muijono, Ibnu W. Laitupa, May 2022. Diagnosis. Diplommatina moluccensis is characterised by a small, dextral shell with a spindle shaped body whorl, first few whorls are low spired, making the shell look decollated, distinct columellar lamella. The species from Moti I. is similar to D. moluccensis collected from the type locality ( Tidore I.).

Description. Shell dextral; spindle-shaped with smooth low spired apex, body whorl narrow, and penultimate whorl is the widest; with 5 to 7 whorls separated by deep suture; protoconch with ribs; teleoconch with oblique ribs; there are more ribs on penultimate whorl than body whorl; without discernible spiral striae between ribs; whitish; subtranslucent; aperture subangular, columello-basal part of aperture is pointed; upper insertion of peristome distinctly ascending towards aperture; insertions of peristome connected by a weak callus; peristome expanded and thickened, slightly doubled on the basal side; aperture with a distinct columellar lamella; laterally right inside the body whorl with a long spiral palatal fold and dorsolaterally right with radial palatal fold along the whorl; umbilicus closed. Shell height 2.3–3.1 mm, shell diameter 1.1–1.3 mm.

Habitat. The specimen was found in secondary forest, in a nutmeg plantation, on a large boulder of volcanic rock covered with herbaceous layers and moss, and in between leaf litter. The species occurs from 0 to 500 m a.s.l.

Distribution. Diplommatina moluccensis is endemic to the North Moluccas, where it has been found so far only on Tidore I., Ternate I., and Moti I. The distribution in Moti I. is a new record.

Figures

Fig. 1. Map of Moti I. in the North Moluccas Archipelago, with the insertion of the North Moluccas in Indonesia and the studied area in Moti I.

Fig. 2. Shells of Diplommatinidae described from Moti I. a, Diplommatina moluccensis Greķe, 2017, (MZB.Gst. 22496). b, Diplommatina radiiformis Preston, 1913, (MZB 22497). c, Palaina motiensis, new species (Holotype, MZB 22493). Scale bars = 1.0 mm.