Ampelita bizonalis is a species of tropical air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Acavidae. 
Description.
The height of the shell attains 17 mm, its diameter 36 mm.
(Original description in French) The shell is very depressed, with a wide, perspective umbilicus. Its somewhat shiny surface is sculpted with prominent, irregular growth lines and is microscopically rough. Five flattened whorls are separated by a fine suture. The body whorl is almost angular at the periphery, significantly widened, and descends abruptly towards the oval aperture. The upper lip is straight, sharp, and barely reflected; the outer lip and especially the lower lip are well reflected and sinuous as they approach the nearly straight columella. A thin layer of callus connects the lips across the inner wall. 
The shell is dark brown towards the periphery, becoming a lighter yellowish-brown on the upper whorls. A whitish line marks the suture. A narrow tawny band appears at the body whorl's angle, and a wider band encircles the umbilicus, which is dark brown within. The lower part of the aperture is chocolate-colored with a white layer, the reflected lip white below, and the rest brownish. 
Distribution.
This species is endemic to Madagascar.