What are the names of all jellyfish in ocean?

It's impossible to list every single species of jellyfish in the ocean! There are thousands of species, and new ones are still being discovered.

However, here are some examples of well-known jellyfish species found in different oceans around the world:

Common Jellyfish:

* Moon Jellyfish (Aurelia aurita): One of the most common and recognizable jellyfish, found in coastal waters worldwide.

* Lion's Mane Jellyfish (Cyanea capillata): The largest jellyfish species, with tentacles that can reach up to 120 feet. Found in the North Atlantic and Arctic Oceans.

* Box Jellyfish (Chironex fleckeri): Found in the Indo-Pacific region, this species is known for its highly venomous sting.

* Portuguese Man-of-War (Physalia physalis): This species is a colony of polyps, not a single animal, and is often found in the Atlantic Ocean.

Other notable species:

* Sea Nettle (Chrysaora quinquecirrha): Found in the Atlantic Ocean.

* Flower Hat Jellyfish (Olindias formosa): Found in the Pacific Ocean.

* Cannonball Jellyfish (Stomolophus meleagris): Found in the Atlantic Ocean.

* Compass Jellyfish (Chrysaora hysoscella): Found in the North Atlantic and Mediterranean Sea.

* Black Sea Nettle (Chrysaora achlyos): Found in the Pacific Ocean.

* Upside-down Jellyfish (Cassiopea andromeda): This species lives upside down on the seafloor.

Note: Jellyfish classification is complex, and there are many variations and regional differences.

To learn more about specific jellyfish species in your area, you can check with local aquariums, marine research institutions, or consult online resources like the World Register of Marine Species (WoRMS).