[3] 350 specimens of Cambrorhytium are known from the Greater Phyllopod bed, where they comprise 0.7% of the community.

[1] The fossil is conical, with iterated linear markings on its walls, parallel to its base.

[2] Its similarity with the Lower Cambrian species Torellelloides giganteum may indicate a close relationship.

[8] C. major was originally described as a member of the hyolith genus Orthotheca.

[9] C. fragilis was originally included by Charles D. Walcott in the genus Selkirkia,[10][11] – a taxonomy that was retained by later workers[12][13] until finally questioned[14] and redescribed[1] as Cambrorhytium in the eighties.