Sinoennea apicata van Benthem Jutting, 1961
“The salient points of discrimination in this species are: the curiously receding angular corner and the single tooth on the palatal side. For a comparison with the other ovoid Sinoennea the widely umbilicated species: charasensis, perakensis, hungerfordiana and tweedei can directly be excluded, and the minute S. lembingensis as well. S. kanchingensis is large and spindle-shaped, without palatal teeth, and S. malaccana is somewhat compressed. S. chintamanensis is more obese than S. apicata, and it possesses two teeth on a common base at the palatal margin. It has a few more ribs on the last whorl, and the angular corner of the peristome, although receding a little, is not curved so much backward as in S. apicata. In S. pagodella there are two free palatal teeth, and a free peristome, moreover S. pagodella is a much smaller species than S. apicata. S. crumenilla and S. chrysalis are both more obese than S. apicata, and in both species the tooth at the margin of the columellar side is lacking. S. bacca is about twice as wide as S. apicata and has two distinct teeth on the palatal margin. Moreover the vertical ribs seem to wear away easily in some places. In S. glebula the ribs on the last whorl are more numerous, and all the ribs are finer and weaker than in S. apicata. In S. leucostolos and S. callizonus there are two distinct teeth on the palatal side and none on the columellar side.” (Benthem-Jutting, 1961)
Benthem-Jutting (1961) original descriptions on Sinoennea apicata – “Shell high-ovoid or pupoid, glassy transparent and shining. Two top whorls smooth, following ones with regular vertical ribs. On the 3rd and 4th whorls the ribs are rather close set, but on the three last whorls they stand wider apart. There are about 14 to 16 ribs on the last whorl. No spiral striation. Whorls about 7, regularly increasing till about the middle of the total height of the shell, then attenuating towards the base. Profile of each whorl convex, suture deep. Top pointed, but not sharp. Base rounded. Umbilicus narrow. Aperture mostly vertical, quadrangular with rounded angles. Peristome adnate, continuousm thickened and reflected. At the parieto-angular corner the right margin recedes distinctly, then curves forward, receding again towards the base. Parieto-angular lamella strong, undulating. On the palatal side one tooth, on the columellar side one small tooth at the peristome margin and a much stronger one deeper down in the throat. The latter corresponds with a groove on the exterior side of the last whorl in the umbilical region. Between the groove and the peristome the distal part of the last whorl is somewhat swollen.”
Sinoennea apicata – “Dimensions (Gua Bama): Height 3.2-4.0 mm; Width 1.7-1.8 mm; Height of aperture 1.1-1.3 mm.: (Gua Sai): Height 2.7-3.4 mm; Width 1.5-1.6 mm; Height of aperture 1.0-1.2 mm.” (Benthem-Jutting, 1961)
Type locality – “Malaya; Gua Bama, near Padang Tengku, Pahang” (Benthem-Jutting, 1961)
Other localities – “Malaya; Gua Sai, near Padang Tengku, Pahang” leg. H. Service (Benthem-Jutting, 1961)