The single toothed jade crab is an animal of the jade crab genus in the jade crab family. The head and chest armor of the single toothed jade crab is diamond shaped, smooth and shiny, with a prominent back and unclear zoning. The forehead margin is thin, with three inconspicuous small teeth, protruding from the central one. The front edge is wavy with indistinct bead like particles, the base is concave, and the rear edge also has the same particles. The rear edge protrudes in an arc shape. The upper limb is well-developed. The claws of the single toothed jade crab are thick and robust, with particles on both the front and rear edges of the long segment. There are two parallel columns of particles on the back, each with 7-8 particles, and a cluster of particles at the base. There are particles on the inner edge of the wrist joint. The palm joint is rectangular with particles on the inner edge. Both fingers have small teeth on their inner edges.