Average adult size: The bell of these jellyfish were 3 feet across and the tentacles were more than 10 feet long.

Natural history: These jellyfish were one of our most exciting "discoveries." It turns out this type of jellyfish had never been seen or filmed before. A new species to science. Specimens were collected and are being studied by jellyfish experts in Los Angeles, California and Fort Pierce, Florida. They tell us similar species of Chrysaora feed on zooplankton captured by their tentacles and long, spiraling oral arms. They swim by contracting muscles inside the bell. Jellyfish don't have eyes, but they have eight sense organs, around the bell, sensitive to light. This way, they can tell up from down. The scientists told us that crabs and medusafish typically are found in association with jellyfish. Crabs are protected from their sting by a thick shell, and medusafish, like the anemonefish, are protected by a slimy, mucus coating.

Range: Not yet known.