Antimelatoma buchanani is a species of predatory sea snail, a marine gastropod mollusc in the family Pseudomelatomidae.

The whorls are carinated, with fine spiral lines, and obliquely plicated anteriorly.

The posterior part is smooth, concave, with a slight ridge at the suture.

The whorls are obliquely longitudinally plaited, and show fine spiral ribs below the sinus area.

[2] The protoconch is composed of two oblique smooth turns, the anterior portion having four deep spiral sulci, cutting through the small longitudinal costae of the brephic stage, into which the protoconch imperceptibly passes.