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Today there are only six living species, all belonging to two genera, Nautilus (the pearly nautilus), and Allonautilus. The recent decrease in the once worldwide distribution of nautiloids is now believed to have been caused by the spread of pinnipeds . [ 7 ]
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 .
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]
The 2nd-century Alexandrian Greek writer Ptolemy, one of the most important geographers, mathematicians and astronomers in the ancient world, refers to Ireland in two of his works. In the astronomical treatise known as the Almagest he gives the latitudes of an island he calls Mikra Brettania (Μικρὰ Βρεττανία) or "Little Britain ...
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 ...
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]
Pope John Paul II visited Ireland from Saturday, 29 September to Monday, 1 October 1979, the first trip to Ireland by a Pope. 1985: 15 November: The governments of Ireland and the United Kingdom sign the Anglo-Irish Agreement. 1990: 3 December: Mary Robinson becomes the first female President of Ireland. 1995
The first Lord of Ireland was King John, who visited Ireland in 1185 and 1210 and helped consolidate the Norman-controlled areas while ensuring that the many Irish kings swore fealty to him. Throughout the thirteenth century, the policy of the English Kings was to weaken the power of the Norman Lords in Ireland.