Shell small, formed by 3 whorls of quick growth, with a nearly flat spire and the periphery delimited by two strong spiral carinae. The protoconch has 1,25 whorls, measures about 290 µm in diameter and has two clearly differentiated periods: the first one smooth with less than 1/2 whorl besides the nucleus and the second, with about 30 thickened ribs.
The teleoconch has 2,25 whorls, delimited by two strong peripheral carinae which angle the shell; the basal one is wider and more prominent, and the adapical one, narrower. Profile with a slightly concave periphery and base concave.
Ornamentation formed initially by spiral grooves of similar size which, are about 12 in number at the beginning of the teleoconch and which after ¾ of whorl form small cells by crossing the axial striae; these are spirally aligned and have different shape and size; on the last whorl 17 lines of cells can be observed on the adapical part, 13 on the periphery and 17 on the base, of which those placed in the umbilical area are of larger size than the others.
Aperture oval, prosocline; parietal zone with a strong callous coat; columella reflected externally; external lip thin, with a sharp border, presenting a prolongation in the area included between the two carinae, which give to the shell a characteristic profile. Umbilicus narrow and deep. The umbilical margin closes in progressively and in the area close to the columella, forms a triangular callus, with spiral cordlets crossing the surface.

Anticlimax simulans spec. nov. is very similar to A faviformis spec. nov. from New Caledonia, being differentiated from the latter by the larger size of the protoconch and by having more growth lines, like ribs, in the second period of this. It also differs by having at the beginning of the teleoconch, 12 spiral grooves transformed into small cells after ¾ of whorl; by having a smaller number of lines of cells on the base and by the periphery being slightly concave.

Distribution: Only known from the Philippines, between 2 and 80 m, and from Papua New Guinea, at 8 m. Habitat: Infra and circalittoral species collected from Philippines at 2 m, on a fine sand and seagrass bottom (Stn. Sll) and at 15-20 m, on a hard ground covered with seagrass (Stn. S22). Also trawled in 80-100 m, on a muddy bottom with sponges PANGLAO 2004 (Stn. T18). In Papua New Guinea at 8 m, on the inner slope (Stn. PS47).