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The giant volcano sponge (Anoxycalyx joubini) is a species of Antarctic sponge. [1] It is one of the largest sponges in the world which can grow up to a diameter of 1.5 metres (5 feet) and 1.95 metres (6.5 feet) in height. [2] The species may have an extremely long lifespan, with estimates of up to 15,000 years. [3]
However, due to changes in sea levels since the Last Glacial Maximum, its maximum age is thought to be no more than 15,000 years, [13] hence its listing of c. 15,000 years in the AnAge Database. [14] The shallow-water occurrence of hexactinellids is rare worldwide. In the Antarctic, two species occur as shallow as 33 meters under the ice.
Otavia antiqua is an early sponge-like fossil found in Namibia in the Etosha National Park.It is claimed to be the oldest animal fossil, being found in rock aged between 760 and 550 million years ago.
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Look for articles on books published in the US before 1923 (as well as most other books published before that date as well, and all published before 1909 [3]) that use copyrighted, modern book covers as illustrations. Category:Books by year and its many subcategories are useful. Add them to the list if they're not already on it.
If verified, the fossils may pre-date the next-oldest undisputed sponge fossils by around 350 million years. ‘890m-year-old sponge fossils’ could be earliest animal life Skip to main content
The size and proportions of a book depend on the size of the original full sheet. If a sheet 480 by 640 mm (19 by 25 in) is used to print a quarto, the resulting untrimmed pages, will be approximately half as large in each dimension: width 240 mm (9 + 1 ⁄ 2 in) and height 320 mm (12 + 1 ⁄ 2 in).
Shown right: Glass sponges (hexactinellids) may live 15,000 years. [ 56 ] Shown left: The largest biosilica structure on Earth is the giant basal spicule from the deep-sea glass sponge Monorhaphis chuni .