Shell small (< 2 mm), formed by slightly more than 3 whorls of quick growth, with a nearly flat spire and the periphery delimited by two thick spiral carinae.
The protoconch has only 1 whorl, measuring 260 µm in diameter and it is formed by two distinct phases: the first, rough, has the nucleus and 3/4 of whorl, and ends in a slight thickening; in the second phase, there are successive axial thickenings, 8-10 in number, like axial ribs, but keeping the surface rough. The teleoconch has less than 2,25 whorls, and is delimited by two thick carinae which angle the shell; the basal carina does not protrude more than the peripheral. Profile with the periphery flattened and base concave.
Ornamentation formed by cells of different shape and size, spirally aligned; there are 8-9 spiral lines at the beginning of the teleoconch and, on the last whorl, in apertural view, can be observed 15 on the adapical part, 20 on the periphery and 20 on the base. Aperture oval, prosocline; parietal callous area with a thick coating; columella externally reflected; outer lip thin, with a sharp edge, presenting an extension in the area between the two carinae, which give it a distinctive profile. Umbilicus wide and deep; in the periumbilical area there is a wide completely smooth strip, without rows or cells; the umbilical margin in the area close to the columella forms a callus of triangular shape, on whose surface run spiral cordlets. Dimensions: the holotype measures 1,75 mm in diameter.

Anticlimax umbiliglabra spec, nov. differs from A. faviformis spec. nov. and A. simulans spec. nov. by having an entirely rough protoconch, and 8-10 axial ribs in the second phase; by having a flattened periphery; because the basal carina is not protruding, and because it has a large smooth area, without cells or grooves, on the umbilical wall.

Distribution: Only known from Panglao Island, its type locality, at 2 m. Habitat: The species was collected at 2 m, on a fine sand and seagrass bottom (Stn. Sll).