The Xidazoon is a kind created in 1999 for fossils belonging to a small animal, baptized Xidazoon stephanus . Found in China, this animal dates from the lower Cambrien and was found in the Schistes of Maotianshan.

The body of the animal is separate in two parts. The former part is moderately swollen, with a prominent mouth. It has light transverse divisions forwards, but is generally smooth. The mouth is composed of about thirty plates divided into an external area and an intern. The former section has moreover 5 structures on each sides, interpreted as being gills, and a dark area with the ventral and posterior margins, interpreted as being a Endostyle. Considering the state in which the former portion was found, one can deduce that it was mainly hollow. With regard to the posterior part, it takes about the shape of a diamond and is divided into six covered segments of cuticules and three others less well defined at the former end. The posterior point is affluent short spines. The authors (Shu, and. Al, 1999) describe a food channel with final openings and a having rectum what could be dilating muscles well.