Stomacosmethis

• Stomacosmethis balingensis

  The shell is globose, with rounded whorl peripheries. The aperture is circular and moderately expanded, with a double, unthickened peristome and no interspace. The operculum exterior is covered by a calcareous layer bearing short spikes. It lives in crevices of wet limestone boulders and on shrubs close to the ground in forested limestone hills. It is known from the Tasik Temenggor area of northern Perak and Bukit Baling and Gunung Pulai in northeastern Kedah, Malaysia.

• Stomacosmethis carinatus

  The shell is almost flat and conical. The whorl periphery is strongly keeled, except posterior to the constriction, where it becomes rounded. The aperture is circular and moderately expanded, with a double, unthickened rim that is winged at the suture. The habitat reported in 2006 is limestone walls in a large collapsed cave. Specimens are recorded from Bukit Sagu and Bukit Tenggek, Pahang, Malaysia.

• Stomacosmethis kelantanensis

  The shell is conical, with rounded whorl peripheries and an open umbilicus. The aperture has a thickened double rim whose upper outer section folds backwards into a wing-like structure. The living body is cream-white, the head pinkish, and the tentacles yellow with red tips. It lives in rock crevices and limestone solution holes in moist, shady forests, in both limestone and non-limestone areas. It is widespread in southern Kelantan, Malaysia, with specimens also recorded from Pahang.

• Stomacosmethis perakensis

  The shell is conical, with rounded whorl peripheries and an open umbilicus. The aperture is circular and expanded, with a double, unthickened rim notched at the suture. The living body is cream-white, the head pink and the tentacles brown. It lives on both dry and wet limestone walls in shady forests on limestone hills. Some individuals have been seen on tree trunks and fallen logs beside limestone cliffs. It is known from central and northern Perak and Bukit Baling and Gunung Pulai in northeastern Kedah, Malaysia, with specimen records from Yala in southern Thailand.

• Stomacosmethis regalis

  The shell is conical, with rounded whorl peripheries and an open umbilicus. The aperture is circular and very expanded, with a double rim that is sometimes thickened. The living body is cream-white, the head pinkish-brown and the tentacle tips brown. It lives on dry rock surfaces covered with powdery lichens. It is known from the limestone karsts of Gunung Senyum and Gunung Jebak Puyuh in central Pahang, Malaysia.

• Stomacosmethis roebeleni

  The shell is conical, with rounded whorl peripheries and an open umbilicus. The aperture is circular and very expanded, with a single to double, unthickened rim. The operculum is concave and rounded, with a smooth exterior covered by a thin calcareous layer. The recorded habitat is moss-covered limestone crevices in shady forests on limestone hills. Specimens are recorded from limestone hills in central Perlis, Malaysia, and Koh Samui and Phatthalung in southern Thailand.

• Stomacosmethis senyumensis

  The shell is conical, with a partially closed umbilicus. The aperture is circular and very expanded, especially on the columellar side; its thickened double rim folds backwards into a wing-like structure on the upper outer side. The living body is cream-white, the head pink and the tentacles yellow or red. It lives on wet, mossy limestone walls and boulders in shady forests on limestone hills. It is known from the limestone karsts of Gunung Senyum and Gunung Jebak Puyuh in central Pahang, Malaysia.