There are 6 rows of knotted thorns on the tail of the American ray. The healing part of the kissing cartilage is shorter than the separation part. There are more than 40 teeth in both jaws. The front part of the body disc is rhomboid, and it is concave on the rostral side and the posterior and lateral edges of the eyes.
They are small bottom-dwelling gills, generally about 300 mm in length. Inhabits shallow sandy bottom waters. It is often mixed with Kong Shao. The difference is that this species has a row of spines on its tail and more teeth in the upper and lower jaws than in the milk. Distributed in the western North Pacific. Found in the Yellow Sea and East China Sea in my country.
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