Mating in cumaceans takes place swimming in open water. Male pleopods are used not only for swimming but also for clasping females. Like other members of the superorder Paricarida, female cumaceans have a ventral breeding chamber (marsupium) formed by plate-like structures on the most proximal section of the first thoracic legs, and eggs are laid into the pouch and brooded there through several moults. The juveniles leave the marsupium as mancae, a stage resembling miniature adults except that they lack their last pair of thoracic walking legs (pereopods). Mancae molt twice more to achieve adult size and develop this last pair of legs. Females also molt several times in between broods (they usually produce three broods in their lifespan).

(Brusca and Brusca 2003; Kozloff 1990)