Shell very small (<1.5 mm), depressed, formed by 3 whorls of rapid growth, separated by a scarcely marked suture; carinate, widely umbilicate and with thick axial folds.
Protoconch about 370 µm in diameter and with 1,75 whorls; the nucleus and the first ¾ of whorl are smooth, the remaining whorl is covered by coarse granules of different sizes, randomly distributed; the end of the protoconch is evident. The teleoconch has a little more than 1 whorl; two marked carinae angle the periphery and a third one outlines the umbilicus. Spire convex, periphery and base almost flat. Ornamentation formed by spiral cords, ribs and axial striae. On the adapical part the cords cross the axial striae forming little raised nodules; on the periphery, the number of cords increases, they are finer and more numerous, but the axial striae dominate; at the base, which is almost flat, there are numerous, fine spiral cords and axial ribs that increase as they get closer to the umbilicus, but fade on the last part and do not form folds. Aperture quadrangular; on its edge there are four angulations: one in the parietal area; another at the intersection of the columella with the umbilical carina and two more produced by the peripheral carinae that modify the outer lip. Only a slight callous layer covers the parietal area; the columella is virtually straight, not reflected or thickened; the outer lip is not very thick. Umbilicus large allowing the previous whorls to be seen, limited by a carina that angles forming a funiculus; on this wall slight traces of spiral cords can barely be observed. Dimensions: The holotype is 1.26 mm in diameter.

The most similar species to Anticlimax reinaudi spec. nov. is Anticlimax serrata spec. nov., from which it differs by the lower number of spiral cords on the adapical part; its straight columellar edge; the double angle observed on the outer lip, formed by the peripheral carinae, and by having a wide umbilicus delimited by another carina.

Only known from Vanuatu at 13 m.