Diplommatina crosseana siputana Tomlin, 1938
Seem to be merely junior synonym of Diplommatina crosseana Godwin-Austen & Nevill, 1879
“This tiny species resembles crosseana Nevill & G.-Austen, but differs in the shape of the aperture; in crosseana this is angular at the base and the columellar margin is perfectly straight.” (Tomlin, 1938)
Tomlin (1938) original descriptions on Diplommatina (Sinica) siputana – “Shell minute, dextral, obtusely conical, whitish yellow, minutely rimate; number of whorls 6½; penultimate whorl broader and more dilated than any of the rest; protoconch of 1½ whorls smooth, all the other whorls sculptured with fine, rather distant, axial protractive costulations; the peristome is double with a strong columellar tooth, aperture almost vertical, peristome complete, and subcircular without angulations at base, columella arched.”
Diplommatina (Sinica) siputana – “Long., 1.5 mm. Diam. max. vix 1 mm.” (Tomlin, 1938)
Type locality – Diplommatina (Sinica) siputana “Sungei Siput, Perak” leg. M. W. F. Tweedie (Tomlin, 1938)