They are viviparous and females brood baby medusae attached to the gastric canals inside the sub-umbrellar space.

Crossota millsae was first described from the Pacific Ocean off Hawaii and California.

[1] It was subsequently found in the Arctic Ocean[3][4] and in Guayanilla Canyon off Puerto Rico.

[5] NOAA researchers who filmed this species in 2018 near Puerto Rico called it a "psychedelic" jellyfish.

[7] It was named after Dr. Claudia Mills, a marine scientist at the Friday Harbor Laboratories.