Sinoennea crumenilla van Benthem Jutting, 1961
“Compared with the other non-cylindrical species Sinoennea crumenilla has a much narrower umbilicus than S. charasensis, perakensis, hungerfordiana or tweediei. S. kanchingensis is a large species, without palatal teeth. The little S. lembingensis and the compressed S. malaccana must be excluded on account of their size, shape and style of ribbing. S. pagodella and S. apicata are different because they possess a tooth at the edge of the columellar side, S. apicata having, moreover, only one tooth at the palatal side instead of two as in the new species. S. pagodella is much smaller and narrower than S. crumenilla. S. chintamanensis is more obese and larger than S. crumenilla. S. chrysalis is much larger and more ventricose than S. crumenilla. The margins of the peristome are less sinuous. S. bacca is considerably higher, with one tooth at the columellar peristome edge. The style of the ribs is also different. S. glebula although being of about the same height as S. crumenilla, is slenderer, and has a less sinuous peristome. The parieto-angular lamella of S. glebula is less strong and the columellar side bears a tooth at the exterior edge. S. leucostolos is rather similar to S. crumenilla, but it is broader, with the ribs standing wider apart. Here again the peristome is less sinuous. Because the parieto-angular lamella is less strong, the distance between this lamella and the palatal teeth is greater than in S. crumenilla. S. callizonus is somewhat more cylindrical, with a larger aperture, a less powerful parieto-angular lamella and a less sinuous peristome margin.” (Benthem-Jutting, 1961)
Benthem-Jutting (1961) original descriptions on Sinoennea crumenilla – “Shell ovoid-pupoid, glassy transparent, shining. Two top whorls smooth, the following ones with regular, rather widely placed vertical ribs, elegantly standing off from the whorls. There are 22 ribs on the last whorl in the holotype. Spiral striation absent. Whorls 6, regularly increasing in size, last one somewhat narrower than the previous one. Profile of each whorl convex, a condition which is accentuated by the wing-like appearance of the ribs. Suture rather deep. Top pointed, but not sharp. Base rounded. Umbilicus distinct, partly obstructed by a swelling in the distal part of the last whorl. Aperture rather small, vertical, quadrangular with rounded angles. Peristome adnate, continuous, thickened, reflected. Parieto-angular lamella strong. Right margin of palatal teeth which correspond with a groove or pit on the exterior distal region of the last whorl, just behind the peristome. Between the palatal tooth and the free end of the parieto-angular lamella there is only a very short distance. Columellar side of peristome without tooth at the exterior edge, but with a blade-like lamella somewhat deeper down. This lamella corresponds with a groove on the exterior distal part of the last whorl, in the umbilical region. Between this groove and the peristome the shell is slightly swollen.”
Sinoennea crumenilla – “Dimensions: Height 2.9 mm; Width 2.6 mm; Height of aperture 1.0 mm.” (Benthem-Jutting, 1961)
Type locality – “Malaya; Bukit Serdam, near Raub, Pahang” (Benthem-Jutting, 1961)