It is also likely that they can see eachother, which might help explain some interesting observations about their mating. Some species of cubozoans appear to pair up, male with female, in order to mate. The male puts his tentacles into the bell of the female and appears to pass packets of sperm. At least one other species has been observed in large mating aggregations. Mating appears to occur once every year.
Fertilization takes place inside the females.
In some species the fertilized eggs are released into the water column where they develop into planulae , while in others development into planulae occurs inside the female. Planulae swim in the water column for a few days and then settle on to the substrate. After settlement, the planulae grow into polyps . The polyps can move around, and they frequently bud off additional polyps. After a few months of feeding, the polyps are mature.