Philalanka thienemanni B. Rensch, 1932

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: 57-58

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/BAB82F18-2415-6300-868F-6BB261576763

treatment provided by

ZooKeys by Pensoft

scientific name

Philalanka thienemanni B. Rensch, 1932
status

 

Taxon classification Animalia Stylommatophora Endodontidae

Philalanka thienemanni B. Rensch, 1932  Fig. 46

Philalanka thienemanni  B. Rensch, 1932: 105; Schilthuizen 2004: 94. Type from Indonesia, Java.

Examined material from Sabah.

Interior Province. Crocker Range N.P., West of the km 10 marker on the road Tambunan-Ranau, Mahua Waterfall (leg. J.J. Vermeulen & M. Schilthuizen, V 14251). West Coast Province. Crocker Range N.P., 22.5 km road Tambunan to Kota Kinabalu, near Rafflesia Park (leg. M. Schilthuizen, V 13530).

Description.

Shell very small, very thin, translucent, pale yellow-corneous to white, conical with convex sides, to almost conical-ovoid; apex rounded. Surface glossy. Whorls moderately convex, last whorl rounded or slightly angular because of the presence of a strong spiral thread. Protoconch whorls convex, smooth or with 1-6 very inconspicuous, thin spiral threads. Teleoconch: last whorl with a distinct, thick peripheral thread coinciding with the suture of the penultimate whorl; next to this thread (traces of) very fine, inconspicuous, well-spaced, very thin spiral threads present except in the umbilical region; with or without (traces of) an even finer (just visible at 40 times magnification), dense spiral striation in between these threads, especially above the peripheral thread. Radial sculpture: locally a few inconspicuous, well-spaced growth lines, locally also very fine (barely visible at 40 times magnification), densely placed riblets. Umbilicus open, wide. Dimensions: Height up to 2.35 mm; width up to 2.6 mm; diameters of the first four whorls 0.5-0.6 mm, 0.90-1.05 mm, 1.3-1.6 mm, 1.80-2.15 mm respectively; number of whorls 6; height aperture up to 0.8 mm; width aperture up to 1 mm.

Habitat in Sabah and distribution.

Found in damp forest on sandstone soil, at 500-1700 m alt. Sabah: Crocker Range. Distribution: Thailand; Java; Bali; Flores.

Remarks.

Shells from Thailand (V5603, from Chiang Mai) have a slightly more distinct spiral sculpture, particularly on the lower surface, than shells from Java. The Borneo shells are intermediate in this respect.