Acmella bauensis, Marzuki & Liew & Mohd-Azlan, 2021

Marzuki, Mohammad Effendi bin, Liew, Thor-Seng & Mohd-Azlan, Jayasilan, 2021, Land snails and slugs of Bau limestone hills, Sarawak (Malaysia, Borneo), with the descriptions of 13 new species, ZooKeys 1035, pp. 1-113 : 1

publication ID

https://dx.doi.org/10.3897/zookeys.1035.60843

publication LSID

lsid:zoobank.org:pub:ED19022E-A170-4DB7-9587-FEFE15D07854

persistent identifier

https://treatment.plazi.org/id/D854D239-B7FD-496D-9A84-AE7B1DCD2418

taxon LSID

lsid:zoobank.org:act:D854D239-B7FD-496D-9A84-AE7B1DCD2418

treatment provided by

ZooKeys by Pensoft

scientific name

Acmella bauensis
status

sp. nov.

Acmella bauensis sp. nov. Figures 15A View Figure 15 , 16A-E View Figure 16 , 17A-C View Figure 17

Material examined.

Holotype (SH 1.24 mm, SW 0.96 mm) (MZU.MOL.20.01), Malaysia, Sarawak, Kuching Division , Fairy Caves, south part of Gunung Kapor, 4 miles Southwest Bau, 1°22'53.97"N, 110°7'2.29"E, coll. M. E. Marzuki, 10.VII.2011 GoogleMaps . Paratypes: 1 ex. (ME0002340), same data as Holotype GoogleMaps .

Differential diagnosis.

This species differs from other Bornean Acmella species by having dull shell surface with inconspicuous, closely spaced spiral striae crossed by inconspicuous growth lines. Acmella conica Vermeulen & Junau, 2007 and Acmella obtusa Vermeulen & Junau, 2007, both from Central Sarawak, have a smaller shell with an elliptic aperture with a flattened parietal side. Acmella minuttisima (Maassen, 2000), from Sumatra, and Acmella subcancellata Vermeulen, Liew & Schilthuizen, 2015, from Sabah have more prominent spiral striae on the shell surface.

Description.

Shell minute, rather thin, translucent, and white. Surface not glossy. Spire conical with slightly convex side, apex rounded, whorls moderately convex, and slightly shouldered. Suture impressed. Protoconch sculpture microscopically cancellated. Teleoconch spiral sculpture with very fine, closely spaced, continuous spiral striae crossed by inconspicuous growth lines just visible at 80 times magnification. Aperture obliquely ovate in outline, with a concave to slightly convex parietal side, transition from parietal to basal side rounded. Peristome simple, expanded but not reflected on the columellar side. Umbilicus open, narrow, 0.08 mm in diameter. Dimensions: height <1.24 mm; width <0.96 mm; the number of whorls <4; aperture height <0.52 mm; aperture width <0.44 mm.

Geographic distribution and habitat.

It is known only from the type locality. Only dry shells were found during the surveys.

Etymology.

The specific epithet Acmella bauensis is from the name of Bau District, where the shells were found.