Tangguanluo is one of the four famous snails in the world, which is named after its appearance resembling the crown hat of China in the Tang Dynasty. It is a national second-class protected animal and cannot be brought into or out of the country at will.

The surface of snail shell in Tangguan is grayish white with irregular reddish-brown markings, and there are large reddish-brown patches near the edge of shell mouth. The mouth is flesh-colored and has a dazzling luster.