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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 chambered nautilus is the title and subject of a poem by Oliver Wendell Holmes, in which he admires the "ship of pearl" and the "silent toil/That spread his lustrous coil/Still, as the spiral grew/He left the past year's dwelling for the new." He finds in the mysterious life and death of the nautilus strong inspiration for his own life and ...
Nautilus are unable to easily move across areas deeper than 800 metres, and most of their activity occurs at a depth of 100–300 metres deep. [4] Nautilus can occasionally be found closer to the surface than 100 metres, however, the minimum depth they can reach is determined by factors such as water temperature and season. [4]
Nautilus (NYS: NLS) is expected to report Q2 earnings on Aug. 5. Here's what Wall Street wants to see: The 10-second takeaway Comparing the upcoming quarter to the prior-year quarter, average ...
On this day 57 years ago, Nautilus-- the world's first nuclear submarine -- accomplished its first undersea voyage to the North Pole. The submarine boasted huge proportions of 3,180 tons ...
Early cephalopods are thought to have produced jets by drawing their body into their shells, as Nautilus does today. [74] Nautilus is also capable of creating a jet by undulations of its funnel; this slower flow of water is more suited to the extraction of oxygen from the water. [74] When motionless, Nautilus can only extract 20% of oxygen from ...
Miocene nautilids were still fairly widespread, but today the order includes only two genera, Nautilus and Allonautilus, limited to the southwest Pacific. The recent decrease in the once worldwide distribution of nautilids is now believed to have been caused by the spread of pinnipeds. [2]