Nausithoe werneri male medusae from Mediterranean’s polyp culture (A–C 5 months old D 3 months old) A aboral view of an adult medusa with mature gonads (g), contracted lappets, and extended tentacles (t) B detail of gastrovascular cavity, focusing on the gastric cirri (gc) C lateral view, focusing on the lips (l) and the extension of the manubrium D beginning of gonad (g) development (aboral view).