Geotrochus paraguensis (E.A. Smith, 1893)

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: 101

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/A48141FA-1D4C-CD21-1D82-F5FF08E7C1CB

treatment provided by

ZooKeys by Pensoft

scientific name

Geotrochus paraguensis (E.A. Smith, 1893)
status

 

Taxon classification Animalia Stylommatophora Trochomorphidae

Geotrochus paraguensis (E.A. Smith, 1893)  Figure 82

Trochonanina paraguensis  E.A. Smith, 1893: 349. Type from Philippines, Palawan.

Trochonanina alexis  E.A. Smith, 1895: 105, syn. n. Type from Malaysia, Sabah, Banggi Island.

Examined material from Sabah.

Kudat Province. Balambangan Island, Kok Simpul (leg. J.J. Vermeulen & M. Schilthuizen, V 9510, BOR/MOL 2433; leg. T.H. Liew, Sazilin & Ramlan, BOR/MOL 3700); Batu Sireh (leg. J.J. Vermeulen & M. Schilthuizen, V 9547). Banggi Island, South end, Karakit Hill (leg. J.J. Vermeulen, V 1462; leg. J.J. Vermeulen & M. Schilthuizen, V 9475).

Description.

Shell medium-sized, rather thin, opaque, uniformly pale yellowish brown, low-conical with flat to slightly convex sides; apex not protruding or only slightly so. Surface with a silky luster above the periphery, shiny below. Whorls: All whorls moderately convex; suture impressed in the inner whorls, not so in the outer, coinciding with the periphery; last whorl acutely angular, not or hardly compressed at the periphery, moderately rounded below the periphery. Protoconch 1 7/8-2 1/8 whorls, smooth. Teleoconch. Radial sculpture: above the periphery growth lines, raised locally and developing in patches with inconspicuous, somewhat irregularly spaced, fine, low riblets, particularly towards the periphery; below the periphery irregularly spaced growth lines only. Spiral sculpture: last whorl with a sharp but not pinched peripheral ridge; start of fifth whorl with 13-17 well-spaced, very fine and thin spiral threads covering most of the whorl except a narrow strip below the suture, at least some spiral threads close to the periphery usually slightly coarser; no spiral sculpture below the periphery. Umbilicus closed. Peristome thickened and reflexed. Dimensions: Height 6-8.5 mm; width 14-22.8 mm; h/w 0.37-0.42; peripheral keel of the last whorl at 0.39-0.53 of the shell height, measured from the apex; diameters of the first 4 whorls 1.4-1.8 mm, 2.4-2.7 mm, 4.0-4.6 mm, 5.7-6.9 mm respectively; number of whorls 6 3/4-7 5/8, height aperture 3.2-5.2 mm; width aperture 8-11.6 mm.

Habitat in Sabah and distribution.

Dry primary lowland forest, coastal forest on limestone soil. Sabah: Banggi and Balambangan Islands. Distribution: Philippines (Palawan).

Cross diagnosis.

Characterized by the combination of lack of spiral colour bands, the not-pinched periphery, the moderately convex whorls and lower surface of the shell.