Ancient Species -
Nautiloids

Nautiloids are molluscs with shells resembling the modern nautilus. The shell is divided into chambers by partitions called septa. The body of the animal is in the last, and largest, of the chamber. A fleshy stalk, the siphuncle,  extends backward through the septs.

The first nautiloids appeared in the early Cambrian Period (570 million years ago). These were tiny creatures with straight, cone-shaped shells less than a quarter of an inch long. Their descendants grew large4r and longer until the middle of the Ordovician Period (525 to 43 million years ago) when some reached 12 feet in length.

Nautilus shell Inside a nautilus shell

Curved shells appeared towards the end of the Cambrian Period (505 million years ago). Some evolved shells which began to curve tightly and then straightened out. The coils helped keep the animal upright and, unlike straight shells, did not get in the way when they swam. As a result coiled nautiloids survived much longer than straight ones.

Nautiloid fossils

  

Nautiloid fossils now available (at eBay):

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Fossil Nautiloid Orthoceras Cephalopod Polished 5.12lbs 12.5"x 8" 400+ myo

AU $214.81
End Date: Wednesday Jun-17-2020 4:59:48 EST
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Large 10 inch Cymatoceras hilli Hays County Texas Fossil Nautiloid Buy It Now

AU $136.05
End Date: Tuesday Jun-16-2020 2:05:58 EST
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PREHISTORIC ORTHOCERAS NAUTILOID CEPHALOPOD POLISHED FOSSIL - EXCELLENT COND

AU $7.15
End Date: Sunday Jul-5-2020 5:48:28 EST
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BUTW 6 Orthoceras Nautiloid fossil 1 1/2" - 2" long pendant necklace 9192P

AU $27.20
End Date: Sunday Jun-28-2020 17:35:14 EST
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Fossil polished Orhtoceras nautiloid cephalopod with original paleo art work

AU $7.16
End Date: Saturday Jun-13-2020 2:57:15 EST
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7513xx WHOLE WIDE BODY Ammonite Nautilus Nautiloid XXL Dino Fossil 144mm 5.7" 3#

AU $150.37
End Date: Monday Jun-8-2020 3:08:37 EST
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BUTW Orthoceras Nautiloid fossil pendant necklace 1662E

AU $14.31
End Date: Saturday Jul-4-2020 9:22:40 EST
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