Epitonium clathrus, also known as the common wentletrap, is a species of small predatory sea snail, a marine gastropod mollusc in the family Epitoniidae, the wentletraps.

It is shiny white to cream coloured, often with brown spots.

Seven thick and very distinct costae (spiral ribs) wind around twelve to fifteen whorls.

These convex whorls often contain two or three purple bands that can best seen when they cross the lamella of the outer lip.

Soft parts (data compiled from George Washington Tryon (1887) and Johannes Thiele (1929)): The short foot is truncated in front and extends far in advance of the head.