Rusty concave snail. "Chlorostomarusticum, commonly known as Chlorostomarusticum. It is a broad-temperature benthic shellfish. The shell is thick and thick, like an equilateral triangle, and the shell width is slightly greater than the shell height. The shell has about 5-6 layers. The top of the shell is slightly The spiral part is higher than the whorl layer, the whorl layer does not expand, and the bottom of the shell is extremely smooth, covered with fine spiral ribs and thick longitudinal ribs that tilt to the right, and the longitudinal ribs intersect with the growth lines. The shell is yellowish brown with dense rust spots. The shell mouth is slanted outward and has a horseshoe shape. The edge of the outer lip is thin and complete, and there is a dark brown and yellow edge extending 1-2 times from the base of the shell. White teeth. The umbilicus is large, deep and round.