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The coloration of the shell of the modern nautilus is quite prominent, and, although somewhat rarely, the shell coloration has been known to be preserved in fossil nautiloids. They often show color patterns only on the dorsal side, suggesting that the living animals swam horizontally.
Nautilus taiwanus is an extinct species of nautiloid, the fossils of which were found in the Shimen and Houdongkeng formations, of the early Miocene, in Nantou County, Taiwan. [ 1 ] [ 2 ] The species was once classified as Kummelonautilus taiwanum , [ 1 ] but reclassified under Nautilus taiwanus in 2022, when it was recognised as the ...
Nautilus (from Latin nautilus 'paper nautilus', from Ancient Greek ναυτίλος nautílos 'little sailor') [3] are the ancient pelagic marine mollusc species of the cephalopod family Nautilidae. This is the sole extant family of the superfamily Nautilaceae and the suborder Nautilina .
The oldest fossils of the genus are known from the Late Eocene Hoko River Formation, in Washington State and from Late-Eocene to Early Oligocene sediments in Kazakhstan. [1] The oldest fossils of the modern species Nautilus pompilius are from Early Pleistocene sediments off the coast of Luzon in the Philippines. [1]
Procymatoceras subtruncatus fossil The Nautilida are thought to be derived from either of the oncocerid families, Acleistoceratidae or Brevicoceratidae (Kummel 1964; Teichert 1988), both of which have the same sort of shells and internal structure as found in the Devonian Rutocerina of Shimanskiy, the earliest true nautilids.
This list of nautiloids is a comprehensive listing of all genera that have ever been included in the subclass Nautiloidea, excluding purely vernacular terms.The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (nomina dubia), or were not formally published (nomina nuda), as well as junior synonyms of more established names, and genera that ...
Nautilus praepompilius is an extinct species of nautilus.It lived from the Late Paleocene through Oligocene epochs.The first fossil specimens discovered in the Late Eocene to Oligocene-aged Chegan Formation of Kazakhstan: an additional, older specimen was found in the Late or Latest Paleocene-aged Pebble Point Formation in Victoria, Australia. [1]
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 not a golden spiral. The shell exhibits countershading, being light on the bottom and dark on top. This ...