Starfish or sea stars are echinoderms About 1,500 living species of starfish occur on the seabed in all the world's oceans, from the tropics to subzero polar waters. They typically have a central disc and five arms, though some species have more than this. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates.
Vampyroteuthis infernalis, literally “vampire squid from hell,” is a living fossil. It’s been on Earth for millions of years, has survived “all major extinction events,” and has hardly changed at all. The foot-long cephalopod — a category that includes squid and octopi — brandishes an umbrella-like cloak and lives 3,000 feet below the surface, where there is very little oxygen.