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  1. Nautilus - Wikipedia

    • Nautiluses are much closer to the first cephalopods that appeared about 500 million years ago than the early modern cephalopods that appeared maybe 100 million years later (ammonoids and coleoids). They have a seemingly simple brain , not the large complex brains of octopus , cuttlefish and squid , and had long been assumed to lack intelligence.… See more

    Overview

    Nautilus (from Latin nautilus 'paper nautilus', from Ancient Greek ναυτίλος nautílos 'little sailor') are the ancient pelagic marine mollusc species of the cephalopod family Nautilidae. This is the sole extant family of the superfa… See more

    Anatomy

    The arm crown of modern nautilids (genera Nautilus and Allonautilus) is very distinct in comparison to coleoids. Unlike the ten-armed Decabrachia or the eight-armed Octopodiformes, nautilus may possess any number of t… See more

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  2. 500 million years ago
    • According to 3 sources
    The first nautilus species appeared over 500 million years ago—hundreds of millions of years before the dinosaurs! By that point, the continents weren’t even completely formed yet. Ancient nautiluses reached up to 10 feet in size, which is much larger than their current maximum size of 10 inches.
    Fossil records show that nautiluses first appeared in the seas over 500 million years ago, during a time known as the Cambrian period. They can be considered living fossils as they have barely changed in appearance since then.
    The nautilus is the only extant (living) representatives of the subclass Nautiloidea, a once diverse and abundant group that originated in the Cambrian period 500 million years ago (mya) and flourished during the Paleozoic and Mesozoic eras.
     
  3. 4 Things to Know About the Nautilus - Ocean …

    Aug 26, 2019 · The first nautilus species appeared over 500 million years ago—hundreds of millions of years before the dinosaurs! By that point, the continents weren’t even completely formed yet. Ancient nautiluses reached up …

     
  4. Nautiloid - Wikipedia

    Nautiloids are first known from the late Cambrian Fengshan Formation of northeastern China, where they seem to have been quite diverse (at the time this was a warm shallow sea rich in marine life).

  5. Nautiloids: The First Cephalopods - The Octopus News Magazine …

  6. What is the difference between Nautiloids and Ammonoids?

  7. Nautiluses: Characteristics, Shells and Species

    Nautiluses come from a branch of mollusk that first appeared 550 million years ago and became mobile in the open sea by developing gas-filled flotation tanks. More than 3,500 nautilus species have been identified on the fossil record.

  8. Chambered nautilus - Wikipedia

    The chambered nautilus (Nautilus pompilius), also called the pearly nautilus, is the best-known species of nautilus. The shell, when cut away, reveals a lining of lustrous nacre and displays a nearly perfect equiangular spiral, although it is …

  9. The 500 Million Year Old Nautilus - PADI Blog

  10. The Nautiloid Network

  11. Nautilus Facts: Habitat, Behavior, Diet - ThoughtCo

    Dec 13, 2019 · At first, prehistoric nautiloids had straight shells, but these evolved into a coiled shape. Prehistoric nautiluses had shells up to 10 feet in size. They dominated the seas, as fish hadn't yet evolved to compete with them for prey. …

  12. Nautilus - New World Encyclopedia

    The nautilus is the only extant (living) representatives of the subclass Nautiloidea, a once diverse and abundant group that originated in the Cambrian period 500 million years ago (mya) and flourished during the Paleozoic and Mesozoic eras.

  13. Nautilus: History, Facts, Size, Habitat, Classification & Much More

  14. Order Nautilida: The Ancient and Enigmatic Nautilus - Earth Life

  15. Rare nautilus sighted for the first time in three decades

  16. Nautilus survives 500 million years -- until humans fancy it

  17. A Broad Brush History of the Cephalopoda - The Cephalopod Page

  18. Chambered Nautilus - The Australian Museum

  19. Nautilus : biology, systematics, and paleobiology as viewed from …

  20. chambered nautilus articles - Encyclopedia of Life

  21. Nautilus: What's in a Name? | Proceedings - February 2001 Vol.