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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 .
Furthermore, unlike the extinct ammonoids, the modern nautilus lacks an aptychus, a biomineralized plate which is proposed to act as an operculum which closes the shell to protect the body. However, aptychus-like plates are known from some extinct nautiloids, and they may be homologous to the fleshy hood of a modern nautilus. [3]
The Trigonocerataceae, in turn, gave rise late in the Triassic through the Syringonautilidae to the Nautilaceae, which include the Nautilidae, with Nautilus. (Kummel 1964) (Kummel 1964) Diversity and evolutionary history
The earliest cephalopods, [b] like Nautilus and some coeloids, appeared to be able to propel themselves forwards by directing their jet backwards. [ 42 ] : 289 Because they had an external shell, they would not have been able to generate their jets by contracting their mantle, so must have used alternate methods, such as by contracting their ...
The classification of species within Nautilus has been contentious for decades, and the genus has been reconfigured and redefined several times throughout its history. Nautilus is the type genus of the family Nautilidae , originally defined as any coiled- shell species with simple sutures , or walls, between shell compartments. [ 7 ]
Originating from within the bactritoid nautiloids, the ammonoid cephalopods first appeared in the Devonian (circa 409 million years ago (Mya)) and became extinct shortly after Cretaceous (66 Mya). The classification of ammonoids is based in part on the ornamentation and structure of the septa comprising their shells' gas chambers.
The Routledge Handbook to the History and Society of the Americas. New York: Routledge (2019) Keen, Benjamin, and Keith Haynes. A History of Latin America (2008) Kennedy, David M., Lizabeth Cohen, and Thomas Bailey. The American Pageant (2 vol 2008), U.S. history; The Canadian Encyclopedia; Morton, Desmond. A Short History of Canada 5th ed (2001)
Because of their oceanic habitat, studies of their life cycle have primarily been based on captive animals and their eggs have never been seen in the wild. [7] Although nautilus have been kept at public aquariums since the 1950s, the chambered nautilus was first bred in captivity at the Waikiki Aquarium in 1995 (a couple of other nautilus species had been bred earlier) and captive breeding ...