Related To Clams
Octopuses, like clams, are invertebrates—animals without backbones. Other marine invertebrates include sea anemones, jellies, sea stars, sea urchins, sea cucumbers and shrimps. You can find marine invertebrates in almost every marine habitat. Some marine invertebrates, including tube worms, live on the ocean bottom near vents that expel sulphide-rich water heated to 400°C. Sulphides are poisonous to most animals, but bacteria in the tube worms’ bodies can metabolize hydrogen sulphide so it’s actually a food source.