Acmella polita Von Moellendorff, 1887

Vermeulen, Jaap J., Liew, Thor-Seng & Schilthuizen, Menno, 2015, Additions to the knowledge of the land snails of Sabah (Malaysia, Borneo), including 48 new species, ZooKeys 531, pp. 1-139 : 5

Taxon classification Animalia Littorinimorpha Assimineidae

Acmella polita Von Moellendorff, 1887 Figure 3

Acmella polita Von Moellendorff, 1887b: 301; Schilthuizen and Vermeulen 2003: 95; Clements et al. 2008: 2761-2762. Type from Philippines, Luzon, Montalban near Manilla.

Examined material from Sabah.

Interior Province. Pinangah valley, Batu Urun (= Bukit Sinobang) (leg. J.J. Vermeulen, V 7979). Pun Batu c. 30 km West of Sepulut (leg. J.J. Vermeulen, V 1270). Sepulut valley, Batu Punggul (leg. J.J. Vermeulen, V 1914); Batu Temurung (leg. J.J. Vermeulen, V 8018; leg. M. Schilthuizen, BOR/MOL 531; leg. J.J. Vermeulen, BOR/MOL 524); Bukit Tinahas, East end of Batu Punggul limestone (leg. J.J. Vermeulen & M. Schilthuizen, V 7608); Gua Pungiton (leg. J.J. Vermeulen & M. Schilthuizen, V 7526; leg. M. Schilthuizen, BOR/MOL 523); Gua Sanaron (leg. J.J. Vermeulen & M. Schilthuizen, V 7646; leg. M. Schilthuizen & A.S. Cabanban, BOR/MOL 1745; leg. M. Schilthuizen, BOR/MOL 530). Sandakan Province. Kinabatangan valley, Batu Keruak 2 near Sukau (leg. J.J. Vermeulen & M. Schilthuizen, V 9784, BOR/MOL 1744; leg. T.S. Liew & B. Elahan, BOR/MOL 3586, BOR/MOL 1834, BOR/MOL 1871, BOR/MOL 3585; leg. M. Salverda & H. van Oosten, BOR/MOL 1749, BOR/MOL 1750); Batu Mawas (leg. T.S. Liew & M. Schilthuizen, BOR/MOL 1980); Batu Pangi (leg. J.J. Vermeulen & M. Schilthuizen, V 9636); Batu Tai (not Bod Tai) near Gomantong (leg. J.J. Vermeulen & M. Schilthuizen, V 9602; leg. T.S. Liew & B. Elahan, BOR/MOL 1900, BOR/MOL 1935); Batu Tomanggong Kecil (leg. J.J. Vermeulen & M. Schilthuizen, V 9697; leg. M. Salverda & H. van Oosten, BOR/MOL 1748); Batu Tulug (Batu Putih) along road Lahad Datu-Sandakan, North of bridge over Kinabatangan River (leg. J.J. Vermeulen & H. Duistermaat, V 1505); Batu Tomanggong Besar (leg. G.E. Wilford, loc. 66, V 13412; leg. M. Schilthuizen, BOR/MOL 3587, BOR/MOL 1742, BOR/MOL 1743); Gomantong Hill 30 km South of Sandakan (leg. J.J. Vermeulen & H. Duistermaat, V 1622); Tandu Batu (leg. J.J. Vermeulen & M. Schilthuizen, V 9624); Unnamed hill near Sukau Police Station (, BOR/MOL 1747, BOR/MOL 1739; leg. T.S. Liew, BOR/MOL 2140; leg. T.S. Liew & B. Elahan, BOR/MOL 2174).Segama valley, North end of limestone ridge on East bank Tabin River (leg. J.J. Vermeulen & M. Schilthuizen, V 7762, BOR/MOL 522). Tawau Province. Gua Madai c. 40 km S.S.W. of Lahad Datu (leg. J.J. Vermeulen & H. Duistermaat, V 1734). Segama valley, ‘Kirk’s Cave’ 8 km North of Lahad Datu (leg. J.J. Vermeulen, V 1242). Semporna area, Segarong Hills, Batu Tengar, 25 km E.S.E. Of Kunak (leg. J.J. Vermeulen & H. Duistermaat, V 1810); Bukit Pababola, 25 km E.S.E. Of Kunak (leg. J.J. Vermeulen & H. Duistermaat, V 1784).

Description.

Shell very small, rather thick, hardly translucent, white. Surface dull or somewhat shiny. Spire conical with approx. flat or slightly convex sides, apex obtuse, whorls moderately convex. Sculpture. Radial sculpture: scattered, inconspicuous growth lines only, at irregular intervals. Spiral sculpture (almost) absent, or locally a very fine, dense spiral striation, just visible at 40 times magn. Aperture obliquely elliptic to broadly ovate in outline, with a straight or slightly curved parietal side, transition from parietal to basal side rounded to obtusely angular. Umbilicus open, (rather) narrow. Dimensions. Height 1.95-4.50 mm; width 1.40-3.00 mm; h/w 1.18-1.50; number of whorls 4 3/4-6 1/2; height aperture 0.85-2.00 mm; width aperture 0.90-1.70 mm.

Habitat in Sabah and distribution.

Primary and secondary forest on limestone bedrock, often in caves. Alt. 0-500 m. Sabah: Interior; East coast. Also in Kalimantan Timur. Distribution: Philippines.

Cross diagnosis.

The largest Acmella species in Sabah.