Boas, 1883
Diagnosis
Marsupium consisting of 7 pairs of lamellae. All pleopods in both sexes, but none of the modified setae in males, are biramous. Statocyst absent. Generally meso- to bathypelagic animals, or epibenthic forms at considerable depths.
Families treated:
Family Lophogastridae
Family Gnathophausiidae
Family Eucopiidae