Common Names: Nautilus, chambered nautilus Phylum: Mollusca Class: Cephalopoda Order: Nautilida Family: Janiroidea Range: Tropical Western Pacific Ocean Natural Environment: During daylight hours, the nautilus spends its time at or near the bottom areas of deep (e.g., 1500-foot) reef slopes. The Chambered Nautilus Is the Ocean’s Most Efficient Jet Engine. The animal only lives in the outermost chamber of the shell. Identification. The spiral shell of chambered nautiluses is thin and smooth with a brown and white pattern. The chambered nautilus (Nautilus pompilius) is hands-down the most famous of these cephalopods. Chambered or emperor nautiluses, Nautilus pompilius (Linnaeus, 1758), reach about 20 cm in length. Aquarist Ellen Umeda is living a childhood dream: working at the Aquarium and raising chambered nautilus hatchlings. Author Biography. Among living cephalopods, only nautilus has an external chambered shell. The chambered nautilus propels itself by sucking in and shooting out water, and uses far … A chambered nautilus hatchling begins to emerge from its egg in a behind-the-scenes nursery. It then migrates upward to about 300 feet to seek prey during evening hours. They have up to 30 chambers created in their shells as the animals increase in size and move to occupy the outermost chamber. It’s one of hundreds laid by adults in our “Tentacles” exhibit. Nautilus are extremely different in many ways from all other living cephalopods in the sub-class Coleoidea. "The Chambered Nautilus" is available in collections such as The Poetical Works of Oliver Wendell Holmes, published by Houghton Mifflin in 1975, as well as in reprint editions of The Autocrat of the Breakfast-Table, such as that published by J. M. Dent & Sons in 1960. Studying these ‘living fossils’ however is useful in understanding the behaviour and evolution of ancestral cephalopods. 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