Sinoennea attenuata van Benthem Jutting, 1961
“From the other cylindrical species of Sinoennea the new species differs in being less slender than S. baculum, higher and broader than S. dactylus, of narrower shape and with finer ribs than S. tiarella. From S. subcylindrica it differs in the slightly greater size and the differently shaped aperture and peristome; the long axis of the aperture is almost parallel with that of the shell, whereas in S. subcylindrica these two make an oblique angle. The difference with S. lenggongensis consist chiefly in the more cylindrical form and more numerous whorls of the last species and in the differently shaped aperture. Compared with S. butleri the new species is higher cylindrical with finer ribs. S. ridleyi can be excluded because of its large size and irregular arrangement of the ribs.” (Benthem-Jutting, 1961)
Benthem-Jutting (1961) original descriptions on Sinoennea attenuata – “Shell narrowly cylindrical, glassy transparent, shining. Two top whorls smooth, the following ones with vertical ribs, about 30 on the last whorl. These ribs wear off easily, leaving regions of the shell surface smooth here and there. No spiral striation. Whorls 7, the three forst regularly increasing in width, the 4th to 7th all of the same diameter, giving the shell its cylindrical form. Profile of each whorl slightly convex, suture distinctm but not deep. Top blunt, base rounded, umbilicus narrow, partly obstructed by a swelling of the last whorl, just before the aperture. Aperture obliquely quadrangular with rounded angles. Peristome adnate, broadened and reflected, with a strong, undulating lamella at the perieto-angular corner. On the palatal margin there are two teeth, the upper one lying flush with the peristome edge, the lower one somewhat more in the throat. On the columellar edge a strong plate-like tooth lies somewhat deeper down. This tooth corresponds with a short groove on the exterior side of the last whorl in the umbilical region. Between this groove an the peristome the distal part of the last whorl is somewhat inflated.”
Sinoennea attenuata – “Dimensions: Height 2.7-3.6 mm; Width 1.3-1.4 mm; Height of aperture 0.8-1.2 mm.” (Benthem-Jutting, 1961)
Type locality – “Malaya; Gua Musang, Kelantan” (Benthem-Jutting, 1961)
Other locality – “Malaya; Gua Madu, Kelantan” (Benthem-Jutting, 1961)