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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 ...
N. cookanus placed within the genus Nautilus, together with extant species based on their shared shell characters. [1] Fossils of the species from the Late Eocene Hoko River Formation are noted as one of the two oldest occurrences for the genus (with the other, older occurrence being N. praepompilius of the Paleogene). [2]
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]
The first and oldest fossil of chambered nautilus displayed at Philippine National Museum. The word nautilus is derived from the Greek word ναυτίλος nautílos "sailor", it originally referred to a type of octopus of the genus Argonauta, also known as 'paper nautilus', which were thought to use two of their arms as sails. [6] [7]
The fossils were first uncovered during the school’s modernization project, which began in 2022. The first find was unearthed in June 2022 beneath the school’s main courtyard, ...
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.
The siphuncle is on the shell periphery in most ammonoids whereas it runs through the center of the chambers in some nautiloids, including living nautiluses. [ 1 ] The subclass Nautiloidea, in its broader definition, is distinguished from other cephalopods by two main characteristics: the septa are smoothly concave in the forward direction ...
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]