“The species lives sympatrically with Opisthostoma (Plectostoma) christae. It can easily be distinguished however, since in A. jensi the aperture is turned upwards, the umbilicus is narrower, and the peristome is flaring. Conchologically A. jensi differs from A. panhai by the lack of a spiral striation, the umbilicus which is not eccentric, the lower number of ribs per mm, and the constriction situated at 0.5 whorl from the aperture.” (Maassen, 2001)
Maassen (2001) original descriptions on Arinia jensi – “Shell dextral, rather low conical, light brown, shining and transparent; with 5.5 distinctly convex whorls, separated by a rather deep suture, and without a spiral striation. The body-whorl is wider than the penultimate whorl. Radial ribs rather thin, increasing much higher and sharper on the lower whorls; on the penultimate whorl 4-6 ribs/mm, above the aperture with 4-6 ribs/mm. The constriction consist of a tranversal thickening all around, and of a small and low, longitudinal tubercle at the angular edge, just entering the transversal thickening. The tuba is 0.5 whorl long. Umbilicus narrow. Peristome flaring, doubled, the inner peristome only slightly protruding from the outer. In frontal view, the aperture is situated at the right of the middle of the previous whorl and clearly turned upwards. Operculum corneous, with a distinct spiral ridge on its outer surface.”
Arinia jensi – “H 2.4-2.7 mm; B 2.2-2.4 mm.” (Maassen, 2001)
Type locality – “Peninsular Malaysia, Kelantan, road 8 Gua Musang to Machang, right side off km 24.9 (04°55’022”N, 102°06’34”E)” leg. J. & C. Hemmen (Maassen, 2001)
Peninsular Malaysia - Kelantan: FELDA Ciku 5, near Gua Musang.