What are the defining characteristics of cubozoa?

Cubozoa, commonly known as box jellyfish, are characterized by their cube-shaped medusa form and remarkable swimming ability. They possess complex eyes arranged in a unique pattern, allowing them to detect light and movement. Cubozoans are known for their potent venom, which can be lethal to humans, and their well-developed nervous system, making them one of the more advanced groups of cnidarians. Additionally, they exhibit a unique life cycle that includes both medusa and polyp stages.