6 genera are assigned to the class CYCLOZOA

Order	Genus	FOP	FOS	LOP	LOS
uncertain	Cyclomedusa	V	u	V	N-Da
uncertain	Hallidaya	V	u	V	u
uncertain	Medusinites	V	u	V	u
uncertain	Nimbia	V	u	Cm	u
uncertain	Planomedusites	V	u	V	u
uncertain	Såkwia	V	u	V	u

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FOP = Period of first occurrence
FOS = Stage of first occurrence
LOP = Period of last occurrence
LOS = Stage of last occurrence

Stage abbreviations follow Sepkoski (2002).