Pupisoma moleculina (van Benthem Jutting, 1940)
Junior synonym of Pupisoma lignicola (Stoliczka, 1871)
“Apart from their smaller size, our two specimens agree well with the original description. Costigo gracilis (Haas) from Luzon is similar in appearance and intermediate in length, though more slender (Haas 1937: 9-10, figs. 21-23). Both species differ from other Costigo species by having only two teeth within the aperture, a columellar, and a parietal lamella. Additional material may show that the two forms are conspecific.” (Thompson & Dance, 1983)
Benthem-Jutting (1940) original descriptions on Costigo moleculina – “Shell oblong-cylindrical, with a rather blunt apex and somewhat broader to the base. Imperforate. Brown, a little more corneous towards the aperture. Shining, translucent, but not diaphanous. Sculptured by oblique lines of growth which, on the body-whorl, merge into a peculiar, wringkled, micro-vermicular structure, only visible under strong magnification. Whorls 5, rounded, but not particularly convex, as the suture, separating the whorls, is not deeply constricted (not so deep as e.g. in C. saparuana Bttg.). Suture with a narrow, but conspicuous, thread-like rim. Last whorl not ascending or descending towards the aperture. Position of aperture oblique. Form of aperture columellar and parietal wall. There are only two teeth, both very white and marked: a parietal one entering the aperture as a very short, compressed fold, and a columellar one, appearing only as a small white knob on the spindle, but not continuing interiorly. Peristome simple, a little dilated on its entire outline, a little more so on the columellar side. Not continuous, the two margins being connected by a thin parietal callus.
Costigo moleculina – “Dimensions of the unique (holotypic) specimen: height 2.2 mm, breadth 1.4 mm, height of the aperture, from the point of attachment of the peristome on the penultimate whorl to the base, 1 mm.” (Benthem-Jutting, 1940); Costigo moleculina – “length 1.77-1.83, width 1.24-1.27” (Thompson & Dance, 1983)
Type locality – Costigo moleculina - “Forest between the village of Tjisolok and the hot springs (Tjipanas) some miles inland, south coast of West Java” leg. K. L. Pfeiffer/Feb. 1939 (Benthem-Jutting, 1940)
Other localities – “Sabah: Kinabatangan Valley, Batu Tumanggong Besar, 1 mi downstream from Sukau, 05°34’N, 118°20’ E” (Thompson & Dance, 1983); “Laos, Bolikhamsay Prov., Houei Khoe near Laksao” leg. A. J. Whitten (Vermeulen & Raven, 1998); “Malaysia. Peninsular, Pulau Langkawi” Coll. Raven (Vermeulen & Raven, 1998)