Cambrorhytium is an enigmatic fossil genus known from the Latham shale (California), and the Chengjiang (China) and Burgess Shale (Canadian rockies) lagerstätte 350 specimens of Cambrorhytium are known from the Greater Phyllopod bed, where they comprise 0.7% of the community. The fossil is conical, with iterated linear markings on its walls, parallel to its base. Its wall is thin, and it lacks the keel that is distinctive of hyoliths. Its name is from the Latin rhytium, drinking horn. C. elongatum has been described to contain an alimentary canal in a single Chinese specimen.