Sars, 1903
The Calanoida are defined by the combination of the gymnoplean tagmosis, the presence of only 1 spine on the outer margin of P2-P5 Exp1, the presence of a coxal epipodite (Le1), but not a lobate basal exite on Mx1, and the presence of a seta on the inner margin of A2 Coxa. The presence of a maximum of 2 setae on the terminal segment of Mx2 (Enp4) is an apomorphy (derived character) of the Calanoida (Huys and Boxshall, 1991).
Family Megacalanidae
Family Calanidae
Family Paracalanidae
Family Mecynoceridae
Family Eucalanidae
Family Spinocalanidae
Family Clausocalanidae
Family Aetideidae
Family Euchaetidae
Family Phaennidae
Family Scolecitrichidae
Family Diaixidae
Family Tharybidae
Family Mesaiokeratidae
Family Arietellidae
Family Augaptilidae
Family Heterorhabdidae
Family Lucicutiidae
Family Metridinidae
Family Phyllopodidae
Family Centropagidae
Family Pseudodiaptomidae