Meet some of the sea’s most unusual-looking animals. With its many primitive features, this rare shark is often called a “living fossil.” He … Christmas Tree Worms, which can be found in warm, tropical waters ranging from the Caribbean to Indonesia, earned their… Strange-Looking Sea Creatures Among the ocean’s countless species, some stand out for their looks—but not always in a good way. 13 of the Weirdest Deep Sea Creatures Giant isopod ( Bathynomus giganteus) Leafy sea dragon ( Phycodurus eques) Chambered nautilus ( Nautilus pompilius) Giant Pacific octopus ( Enteroctopus dofleini) Pigfish ( Congiopodidae) Atlantic wolffish ( Anarhichas lupus) Sixgill shark ( Hexanchus griseus) Frilled Shark.