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A new species of deep sea jellyfish, Crossota millsae evince sexually dimorphic differences in gonad morphology. They only reproduce sexually as medusa, never forming polyps, and are viviparous; females brood baby medusae attached to the gastric canals in the sub-umbrellar space. Unlike most hydromedusae, none of the Crossota have a sessile stage. They instead spend their entire lives in the water column as plankton.