Pacific sea nettle The brilliantly named Pacific sea nettle is a red-tinted jellyfish that lives in ... and bright white on a black background, making it a favourite for underwater photographers.

How many species of jellyfish are there? Jellyfish are sometimes called sea jellies. They belong to a group called Medusozoa which is divided into four classes: Hydrozoa, Scyphozoa, Cubozoa and ...

Empty circles are the nematocysts, or stinging cells, of jellyfish that have been packed together and wrapped tightly into packages of feces in the beginning of the lobster's digestive tract.