The cannonball jellyfish (Stomolophus meleagris), also known as the cabbagehead jellyfish, is a species of jellyfish in the family Stomolophidae. Its common name derives from its similarity to a cannonball in shape and size. Its dome-shaped bell can reach 25 cm (10 in) in diameter. The rim is often colored with brown pigment. There are several known undescribed Stomolophus species found in the Pacific and South Atlantic that exhibit pale to blue pigment.

This animal was originally part of a pack known as the Jellyfish Pack. The Jellyfish Pack was done at ZooAdmin and each jellyfish is skinned by a different member of that site. These animals will not reproduce and do not require any food/enrichment, acting like ambients. But, guests will still view and enjoy them.

This particular jelly’s skin was contributed by Nique. Like many other downloads of its time, it was a collaboration that Penguinman created with another user. It includes a gift for guests to purchase.

This download has a couple known issues:

• Although the jellyfish don’t need to be fed, they do eat through a unique behavior of sifting the water for food. Sometimes they don’t perform certain need-fulfilling behaviors like sifting when they should, which will lead to that need being unfulfilled. This is temporary and resolves itself on its own without the need for player intervention.
• Its Zoopedia article text is actually the flower hat jellyfish’s.

Other downloads in the ‘Jellyfish Pack’ set:

• Yellow Jellyfish
• Purple-Striped Jellyfish
• Lion’s Mane Jellyfish
• Granrojo
• Flower Hat Jellyfish
• Australian Spotted Jellyfish
• Deepwater Trachymedusa
• Mauve Stinger
• Cannonball Jellyfish
• Fried Egg Jellyfish
• Cross Jellyfish