Burmeister, 1834
The Cyclopoida are defined by their podoplean tagmosis, by the possession of a combination of digeniculate A1 bearing a sheath on segment 15 in males with the lack of a defined A2 Exp. The A2 Exp is represented by up to 3 setae, but no Exp segment remains. They are also characterized by the fusion of Enp1 and Enp2 of Mx2 and by a 4-segmented Md Exp derived by loss of the ancestral Exp1 (Huys and Boxshall, 1991).
There is one cyclopoid family considered in the present chapter, Family Oithonidae.