Kaliella microconus (Mousson, 1865)

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 : 62-66

Taxon classification Animalia Stylommatophora Euconulidae

Kaliella microconus (Mousson, 1865) Figure 52, 54

Nanina microconus Mousson, 1865: 192. Coneuplecta microconus (Mousson) H. Burrington Baker, 1941: 236; Schilthuizen and Rutjes 2001: 420; Schilthuizen et al. 2002b: 42; Schilthuizen and Vermeulen 2003: 96. Kaliella microconus (Mousson); Schilthuizen 2004: 94; Clements et al. 2008: 2762; Schilthuizen et al., 2011: 5; Schilthuizen et al. 2013: online supplementary data. Type from Fiji.

Sitala bandongensis Boettger, 1890: 141. Coneuplecta bandongensis (Boettger) Van Benthem Jutting, 1950: 388. Type from Indonesia, Java, Bandung, Gunung Malabar.

Sitala baritensis E.A. Smith, 1893: 343. Durgellina baritensis (E.A. Smith) Rensch, 1932: 68. Type from Malaysia, Sarawak, Barit Mountain.

Sitala singularis Godwin Austen, 1891: 39. Type from Malaysia, Borneo.

Examined material from Sabah.

Interior Province. Crocker Range N.P., Gua Laing c. 12 km North of Keningau (leg. J.J. Vermeulen, V 1094); Mahua (leg. M. Schilt huizen, BOR/MOL 2394). Gunung Trusmadi slopes, Gua Loloposon (leg. J.J. Vermeulen, V 13233). Pinangah valley, Batu Urun (= Bukit Sinobang) (leg. J.J. Vermeulen, V 1142, V 8007). Pun Batu c. 30 km West of Sepulut (leg. J.J. Vermeulen, V 1279). Sepulut valley, Batu Punggul (leg. J.J. Vermeulen, V 1988); Batu Temurung (leg. J.J. Vermeulen, V 8049; leg. M. Schilthuizen, BOR/MOL 808); Bukit Tinagas, East end of Batu Punggul limestone (leg. J.J. Vermeulen & M. Schilthuizen, V 7826; leg. M. Schilthuizen, BOR/MOL 801, BOR/MOL 3620); Gua Pungiton (leg. J.J. Vermeulen & M. Schilthuizen, V 7561); Gua Sanaron (leg. J.J. Vermeulen & M. Schilthuizen, V 7827). Kudat Province. Balambangan Island, Kok Simpul (leg. J.J. Vermeulen & M. Schilthuizen, V 9521); Gua Mundau (leg. T.S. Liew & M. Schilthuizen, BOR/MOL 4371). Sandakan Province. Kinabatangan valley, Batu Mawas (leg. T.S. Liew & M. Schilthuizen, BOR/MOL 1961, BOR/MOL 1997; leg. M. Schilthuizen, BOR/MOL 2392); Batu Materis (leg. T.S. Liew & B. Elahan, BOR/MOL 2122); Batu Keruak 2 near Sukau (leg. J.J. Vermeulen & M. Schilthuizen, V 9811, BOR/MOL 2389; leg. M. Salverda & H. van Oosten, BOR/MOL 2393); Batu Pangi (leg. J.J. Vermeulen & M. Schilthuizen, V 9664, BOR/MOL 2388); Batu Tai (not Bod Tai) near Gomantong (leg. J.J. Vermeulen & M. Schilthuizen, V 9588, BOR/MOL 2395; leg. T.S. Liew & B. Elahan, BOR/MOL 1919, BOR/MOL 1942); Batu Tomanggong Kecil (leg. J.J. Vermeulen & M. Schilthuizen, V 9706); Batu Tomanggong Besar (leg. T.S. Liew & B. Elahan, BOR/MOL 2288; leg. M. Schilthuizen, BOR/MOL 2391, BOR/MOL 802); Batu Tulug (Batu Putih) along road Lahad Datu-Sandakan, North of bridge over Kinabatangan River (leg. J.J. Vermeulen & H. Duistermaat, V 1486); Gomantong Hill 30 km South of Sandakan (leg. J.J. Vermeulen & H. Duistermaat, V 1620; leg. A. van Til, BOR/MOL 3266, BOR/MOL 3297; leg. T.S. Liew & J.P. King, BOR/MOL 3663); Tandu Batu (leg. J.J. Vermeulen & M. Schilthuizen, V 9620); Hill Ulu Sungai Resang (leg. M. Schilthuizen, BOR/MOL 2390); Unnamed hill near Sukau Police Station (leg. T.S. Liew & B. Elahan, BOR/MOL 2191, BOR/MOL 2227; leg. M. Schilthuizen, BOR/ MOL 2387). Segama Valley, North end of limestone ridge on East bank Tabin River (leg. J.J. Vermeulen & M. Schilthuizen, V 7786). Tawau Province. Batu Baturong c. 50 km W.S.W. of Lahad Datu (leg. J.J. Vermeulen & H. Duistermaat, V 1860); North slope (leg. J.J. Vermeulen, V 7598). Danum Valley (leg. T. Kimsin & H.N. Chai, BOR/MOL 804; leg. H.A. Rutjes, BOR/MOL 805). Gua Madai c. 40 km S.S.W. of Lahad Datu (leg. J.J. Vermeulen & H. Duistermaat, V 1728); N.E. end (leg. J.J. Vermeulen, V 7709). Segama valley, hill N.W. of crossing road Sandakan-Lahad Datu with the Segama River (leg. J.J. Vermeulen & H. Duistermaat, V 1680); ‘Kirk’s Cave’ 8 km North of Lahad Datu (leg. J.J. Vermeulen, V 1233); Sabahmas Cave (leg. J.J. Vermeulen, V 7825, BOR/MOL 803). Semporna area, Segarong Hills, Batu Tengar, 25 km E.S.E. of Kunak (leg. J.J. Vermeulen & H. Duistermaat, V 1790); Bukit Pababola, 25 km E.S.E. of Kunak (leg. J.J. Vermeulen & H. Duistermaat, V 1776). West Coast Province. Kinabalu N.P., Poring Hot Springs, along path to waterfall (leg. J.J. Vermeulen, V 13015); Orchid Garden (leg. J.J. Vermeulen, V 13028); Serinsim (leg. M. Schilthuizen, BOR/MOL 3075). Kota Kinabalu, Kiansom (leg. M. Schilthuizen, BOR/MOL 807).

Description.

Shell very small, thin, somewhat translucent, pale brown, conical with flat sides; apex rounded. Surface shiny. Top whorls moderately convex, outer whorls slightly convex, last whorl angular at the periphery, slightly convex below the periphery. Protoconch whorls convex, with predominant, well-spaced, very thin spiral threads, and very fine, densely and somewhat irregularly placed radial riblets. Teleoconch: Spiral sculpture predominant, above the periphery with fine, well-spaced, very thin spiral threads (usually 10 or fewer on the last whorl); below the periphery and close to it with a few to many more of such threads, towards the umbilicus sometimes with much finer, densely placed grooves. Radial sculpture teleoconch: above the periphery growth lines grading into very fine, densely and somewhat irregularly placed radial riblets; below the periphery with irregularly spaced growth lines only. Umbilicus open, very narrow. Dimensions: Height up to 3.0 mm; width up to 2.9 mm; diameters of the first four whorls 0.45-0.60 mm, 0.75-1.00 mm, 1.05-1.45 mm, 1.45-2.00 mm respectively; number of whorls up to 6 1/8; height aperture up to 0.9 mm; width aperture up to 1.4 mm. Radula: central 3-cuspid; laterals and marginals similar, serrate with 2 large cones at the tip.

Habitat in Sabah and distribution.

Primary and secondary forest on limestone and sandstone soil. Alt. up to 1000 m, elsewhere up to 1700 m alt. Sabah: widespread. Also in Sarawak; Kalimantan. Distribution elsewhere: Vietnam; Peninsular Malaysia to Java; Eastwards to Australia; Fiji; Samoa.

Remarks.

Information on the radula is from Van Benthem Jutting (1950). No Sabah material included in Kaliella microconus has been checked for radula characters.