Arinia yanseni Hausdorf 2017, n. sp.
Creators: name: Hausdorf, Bernhard
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Architaenioglossa
Diplommatinidae
Arinia
Arinia yanseni

description: Arinia yanseni n. sp.
(Figs 8, 18, 48; Table 2)
Diagnosis. Arinia yanseni n. sp. is characterized by a cylindrical, widely ribbed shell with a furrow in the parietalpalatal angle of the aperture and a narrow umbilicus.
Shell (Figs 8, 48; Table 2). Dextral; cylindrical with conical early whorls; with 4.5–5 whorls separated by a deep suture; protoconch smooth; teleoconch with widely spaced ribs (27–43 on penultimate whorl); without distinct spiral striae between the ribs; whitish; subtranslucent; last whorl rounded, without constriction; aperture almost circular; upper insertion of the peristome slightly ascending towards aperture; insertions of the peristome connected by a distinct callus; peristome distinctly expanded, thickened, doubled; thickening of peristome indented in the parietal-palatal angle so that a furrow is formed; without lamellae; with a short, oblique palatal fold close to the suture dorsoventrally left inside the last whorl; umbilicus narrow; operculum thin, smooth, corneous, ovoidcircular, paucispiral. Shell height 1.55–2.0 mm, shell diameter 1.05–1.25 mm, umbilicus wide 0.1–0.2 mm.
Remarks. Arinia yanseni shares the furrow in the parietal-palatal angle of the aperture with some species from Borneo described by Vermeulen (1996). Among them, A. pertusa Vermeulen, 1996, A. cylindrica Vermeulen, 1996 and A. clausa Vermeulen, 1996 are most similar to A. yanseni n. sp. with regard to shell shape and ribbing. These species differ from A. yanseni n. sp. in the more distinct angular fold delimiting the furrow in the parietal-palatal angle of the aperture. Moreover, the umbilicus of Arinia yanseni n. sp. is narrower than that of Arinia pertusa, but wider than that of Arinia cylindrica and Arinia clausa.
Habitat. In leaf litter in teak plantation, bamboo forest and secondary forest at 230–716 m a.s.l.
Type material. Holotype: Indonesia, Java, East Java: Rembang, Sumber Pacusen, 230 m a.s.l. 6°51'14"S 111°28'52"E (MZB 18893, leg. A.S. Nurinsiyah & T. Setiadi 11 May 2015, D = 1.25 mm, H = 2 mm). Paratypes: East Java: Rembang, Sumber Pacusen, 230 m a.s.l. 6°51'14"S 111°28'52"E (BDJ/3; FW/3; MN/3; NHMUK 20170134 /5; MZB 18882/many; RMNH 5005193 /5; SMF 349068 /5; ZMB 121919 /5; ZMH 133051 /25). — West Java: Bibijilan, waterfall Sukabumi, 716 m a.s.l., 0 7°01'26"S 106°54'20"E (MZB 18883/1). — Sumatra, Lampung: limestone area between Gua Tigal and Bukit Mapus, Waytuba, 4°23'S 104°25'E (BP 001/6; ME 2522/8; MZB 17981/15; ZMH 133305 /10; YSC 1488 /69).
Distribution (Fig. 18). Arinia yanseni n. sp. is known from Java and southern Sumatra.
Etymology. The species is named in honour of the Indonesian malacologist Yansen Chen, who discovered this new species independently of us in southern Sumatra.
description: Published as part of Hausdorf, Bernhard, 2017, Revision of the Diplommatinidae (Gastropoda: Cyclophoroidea) from Java, pp. 201-245 in Zootaxa 4312 (2) on page 239, DOI: 10.11646/zootaxa.4312.2.1, http://zenodo.org/record/892895