Pseudonenia penangensis penangensis (Stoliczka, 1873)
“This is an extremely variable species as regards the shorter or longer fusiform shape of the shell, and also as regards the size of the aperture, but both these variations are very commonly observed in other species of the genus, and particularly in the allied Malayan species Cl. gouldiana Pfr., insignis, Gould, and sumatrana, Marten. All three have a similarity variable shape, and finely striated, moderately convex, whorls but in the two former the aperture is much shorter of a squarish shape, and in the last it is conspicuously longer; E. von. Martens gives its length at 8 mm in a specimen, the total length of which is from 23.5 to 31.5 mm. In this last species, which also comes nearest to the Penang shell, the whorls appear to be slightly less convex and there are only five palatal plates present.” (Stoliczka, 1873)
Stoliczka (1873) original descriptions on Clausilia (Phaedusa) penangensis – “C. testa fusiformi, plus minusve atenuata, medio ad anfractum penultimum latissima, non rimata, solidula, castanea, apice submammillata, albescente, anfractibus 9.5 ad 10.5, convexis, sutura simplici junctis, transversim castanea, peristomate modice expanso, undique libero, albescente, plica supera crassa, ad marginem aperturae continua, columellari immersa, tenui, valde oblique intrante; plicis palatalibus six, prima longissimima, unam mill a margine suturali distante, ceteris multo brevioribus, subaequalibus, modice curvatis atque fere aequidistantibus.”
Loosjes (1953) descriptions on Pseudonenia penangensis penangensis – “Shell large, ventricose fusiform, solid, usually reddish- to violet-brown, dull or slightly glossy, opaque. Spire thick, conical, with straight lateral outlines, exceptionally slightly concave. Whorls 9-11, usually 10, rather convex, not or only vaguely striated, almost smooth, the neck is also sculptured with only very fine transverse striae. There is often a cream-coloured zone on the whorls below the rather deep suture. The nuclear whorls form a rather blunt apex. Sometimes they are a little narrower than the following whorl, hence the profile of this part of the shell may be faintly concave. The neck is slowly bent towards the base of the aperture. Aperture pear-shaped, small in comparison to the large broad shell, chestnut within. The sinulus is extremely large. There is a distinct angle in the upper margin of the peristome, in the place where it is touched by the superior lamella. The base of the aperture recedes a little. The peristome is continuous, whitish and shining, sharp or a little reflexed; the upper margin is clear of the preceding whorl. From the sinulus the outer margin is regularly but slightly curved downward, the parieto-columellar margin is regularly and distinctly bent. Lamella superior is high and reaches the margin, it is connected with lamella spiralis, which ends ventrally. Lamella inferior is low and, in a front view, distinctly visible at the columellar side, where it does not reach the margin. It runs rather steeply upward and inward, its base is not visible if one looks obliquely from below into the aperture. Sometimes the columella protrudes inward as well-marked edge and gives impression that the lamella inferior is forked. The inferior lamella ends inward together with the lamella subcolumellaris beyond the spiral lamella. Lamella subcolumellaris is not visible if one looks into the aperture, as its lies behind the lamella inferior. The closing apparatus is situated at the right side. The plica palatalis principalis runs from the right to the left side, it is about a half whorl long and ends close behind the outer margin of the peristome. Below it are 4 to 8 rather long, more of less parallel, palatal plicae, of which 4 or more at least are nearly equally long. They are fairly regularly distributed over the whorl. Lamella subcolumellaris is scarcely visible through the shell. The plate of the clausilium is long and has parallel sides. The top is only slightly thickened, length 3.4, width 1.6 mm.”
“The animal is unform grey covered with small pale brown warts, darker on the back, paler on the pedicles, which have very small, black eyes; tentacles very short. The genital organs are distinguished by a very length of both the uterus and the penis, both of which are much twisted. The only appendage is that of the seminal receptable, which is comparatively small and narrow, situated at the end of a long peduncle. The jaw is very short, about 0.5 mm broad, apparently smooth; only vary faint radiating and concentric lines are to be observed in certain lights. The radula is about 2 mm long and 0.5 mm broad; it consists of about 125 rows, with 61 teeth in each row. All are provided with a strongly curved cusp; after about the fifteenth tooth, they rather rapidly decrease in length. Towards the end of each row they become multi-serrated, while the basal plate almost entirely disappears. The last teeth are very short, but broad, almost linear and entire.” (Stoliczka, 1873)
Clausilia (Phaedusa) penangensis – “Var. brevis. Exquisite fusiformis; long. 24, lat. 6.2, apert. cum perist. 6 longa, 4.5 mm lata. Var. elongate fusimormis; long. 26.3, lat. 6.2, aper. 6.9 longa, 4.7 mm lata; in hoc specimine apertura exceptionaliter longe est, in speciminibus alteris, forma similibus, longitudo 6.2 ad 6.4 observanda. Var, exilis, attenuate fusiformis; long 27, lat 6, long. Apert. 6.3, lat. 4.6 mm.” (Stoliczka, 1873); Pseudonenia penangensis penangensis – “length of the shells: 23.0 to 30.4 mm, diam. 5.5 to 7.3 mm; aperture; height 5.8 to 8.1 mm, width 4.2 to 5.7 mm.” (Loosjes, 1953)
Type locality – “Penang” (Stoliczka, 1873)
Other localities – “Belimbing, State of Ligeh” (Collinge, 1902); “Bukit Besar, 2000 ft., State of Nwang Chik” (Collinge, 1902); “Patalung” (Collinge, 1902); “Bukit Besar, Nawngchik, 2500 feet” (Collinge, 1903); “Malay Peninsula: Perak, Kuala Kangsar” (Loosjes, 1953); “Malay Peninsula: Kedah, Baling” (Loosjes, 1953)
“Found on dead trees, feeding on fungi.” (Collinge, 1903)