Kaliella eurytrochus Vermeulen, Liew & Schilthuizen

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: 69-70

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/DF754721-4B13-4E3A-8C5A-75A11CC1D8BB

taxon LSID

lsid:zoobank.org:act:DF754721-4B13-4E3A-8C5A-75A11CC1D8BB

treatment provided by

ZooKeys by Pensoft

scientific name

Kaliella eurytrochus Vermeulen, Liew & Schilthuizen
status

sp. n.

Taxon classification Animalia Stylommatophora Euconulidae

Kaliella eurytrochus Vermeulen, Liew & Schilthuizen  sp. n. Figure 60

Holotype. Malaysia, Sabah, Interior Province , Gunung Trusmadi slopes , Gua Loloposon ( RMNH.5003922). View Materials 

Examined material from Sabah.

Interior Province. Gunung Trusmadi slopes, Gua Loloposon (leg. J.J. Vermeulen, V 13237). Tawau Province. Danum Valley Conservation Area, 2 km N.W. of Danum Valley Field Centre (leg. H.A. Rutjes, V 13513).

Description.

Shell small, rather thin, somewhat translucent or opaque, pale yellow-corneous to white, depressed-conical with approx. flat or slightly convex sides; apex rounded. Surface shiny. Whorls moderately convex, last whorl angular at the periphery, rounded above and below the periphery. Protoconch whorls convex, with numerous fine, rather densely placed radial riblets, which are most distinct below the suture; numerous approx. equally strong, densely placed spiral grooves cutting into the crests of the radial riblets. Teleoconch: Last whorl with a peripheral spiral thread coinciding with the suture of the penultimate whorl, above and below this numerous fine, moderately and regularly spaced, continuous spiral grooves. Radial sculpture: growth lines above the periphery, at somewhat irregular intervals, which are approx. as strong as the spiral sculpture, and which are most distinct just below the suture. Umbilicus closed. Dimensions: Height up to 2.65 mm; width up to 3.8 mm; diameters of the first four whorls 0.80-0.85 mm, 1.5-1.6 mm, 2.35-2.50 mm, 3.6-3.7 mm respectively; number of whorls up to 4 1/8; height aperture up to 1.5 mm; width aperture up to 2.0 mm.

Habitat in Sabah and distribution.

Primary forest on limestone and sandstone soil. Alt. c. 400-1000 m. Sabah: Gunung Trusmadi; Danum Valley. Two localities. Endemic to Sabah.

Cross diagnosis.

Differs from Kaliella gregaria  by its smaller size, at the same number of whorls. In Kaliella eurytrochus  , the whorls increase less fast in width; compare the diameters of the third whorl of both species. The shell of Kaliella eurytrochus  is also distinctly thicker, and less fragile.

Etymology.

The name refers to the inflated shell shape [eurus (Gr.) = wide; trokhos (Gr.) = wheel, a word often used for the gastropod spire].