Geotrochus whiteheadi (E.A. Smith, 1895)

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: 110-111

publication ID

http://dx.doi.org/10.3897/zookeys.531.6097

publication LSID

lsid:zoobank.org:pub:C845838E-C912-4BD8-AB4E-07980F91959E

persistent identifier

http://treatment.plazi.org/id/7BEF00E5-F2B5-86C1-250B-ECAB3FF4EC96

treatment provided by

ZooKeys by Pensoft

scientific name

Geotrochus whiteheadi (E.A. Smith, 1895)
status

 

Taxon classification Animalia Stylommatophora Trochomorphidae

Geotrochus whiteheadi (E.A. Smith, 1895)  Figure 90

Helix conicoides Metcalfe var. parva  E.A. Smith, 1887: 132. Trochonanina whiteheadi  E.A. Smith, 1895: 106. Type from Malaysia, Sabah.

Examined material from Sabah.

West Coast Province.Kinabalu N.P., Carson’s Falls (leg. J.J. Vermeulen, V 12710); Serinsim-Numbuyukon trail between 700 and 1680 m (leg. T.S. Liew, BOR/MOL 4024, BOR/MOL 4104); Monggis-Tambuyukon trail at 2080 m (leg. T.S. Liew, BOR/MOL 4110); Mesilau trail at 1948 m (leg. T.S. Liew & J. Lapidin, BOR/MOL 4393); Summit trail between 1700 and 1784 m (leg. T.S. Liew, BOR/MOL 4392; leg. T.S. Liew & Dominik, BOR/MOL 4396).

Description.

Shell rather small, rather thin, about opaque, pale corneous to pale brown, low-conical with approx. flat sides; apex not protruding. Surface with a silky luster above the periphery, shiny below. Whorls: Apical whorls moderately convex, outer slightly convex, slightly shouldered; suture impressed in the inner whorls, hardly so in the outer, coinciding with the periphery; last whorl acutely angular, (slightly) compressed at the periphery, moderately rounded below the periphery. Protoconch 2 1/8-2 1/4 whorls, smooth. Teleoconch. Radial sculpture: above the periphery growth lines, slightly raised locally; below the periphery indistinct growth lines only. Spiral sculpture: last whorl with a sharp, somewhat pinched peripheral keel; start of fifth whorl with c. 15 thin, moderately spaced spiral threads: 1-2 slightly more distinct close to the periphery, as well as 13-14 inconspicuous above these; no spiral sculpture below the periphery. Umbilicus closed. Peristome thickened and reflexed. Dimensions: Height 5.5-6.0 mm; width 12.3-12.5 mm; h/w 0.44-0.48; diameters of the first 4 whorls 1.2-1.4 mm, 2.1-2.4 mm, 3.4-3.8 mm, 5.2-5.8 mm respectively; number of whorls 6 1/4-6 3/8, height aperture 3.3-3.5 mm; width aperture c. 6.5 mm.

Habitat in Sabah and distribution.

Mixed montane forest, 700-2100 m alt. Sabah: Mount Kinabalu only. Endemic to Sabah.