Speleocyclotus

• Speleocyclotus holcobasis

  The spire is low-conical, with a widened last half-whorl. A single broad, shallow furrow on the underside remains visible inside the umbilicus to the first whorl. The aperture is approximately circular; its slightly thickened and widened rim is deeply incised where the basal furrow starts. Shells are recorded from deep soil deposits in moderately disturbed to degraded partly deciduous woodland on limestone bedrock, and from a cave entrance. Shells are recorded from Nui Chau Hang and Nui Nai, Kien Luong District, Kien Giang Province, Vietnam.

• Speleocyclotus laangensis

  The spire is almost flat, with protruding apical whorls and a widened last half-whorl. The outer whorl has dense radial riblets with thin, rather low crests that erode easily and persist best near the suture and umbilicus. The aperture is approximately circular, with a slightly thickened and widened rim. Shells are recorded from deep soil deposits in partly deciduous woodland on limestone bedrock, including moderately disturbed sites, and from the twilight zone of caves. Shells are recorded from Phnom La’Ang and two satellite hills, Kampot Province, Cambodia.

• Speleocyclotus macrocoryphe

  The spire is low-conical, with a widened last half-whorl. The outer whorl has unevenly spaced growth lines, some developing into radial riblets without crests towards the aperture. The aperture is somewhat elliptic, with a slightly thickened and widened rim. Shells are recorded from a cave entrance in moderately disturbed, low, locally shrubby partly deciduous woodland on limestone bedrock, and mineral soil in a cave’s dark zone. Shells are recorded from Nui Chua Hang, Kien Luong District, Kien Giang Province, Vietnam.

• Speleocyclotus microcoryphe

  The spire is rather low-conical; the last half-whorl is not or hardly widened. The outer whorl bears dense, somewhat uneven radial riblets with thin low crests that erode easily and persist better around the umbilicus. The aperture is circular, with a slightly thickened and widened peristome. Shells are recorded from deep soil deposits in moderately disturbed to degraded partly deciduous woodland on limestone bedrock, and organic soil deposits in caves. Shells are recorded from the Kampot and Banteay Meas areas of Kampot Province, Cambodia, and Kien Luong District, Kien Giang Province, Vietnam.