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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]
The volcano sponge consists of a pale yellow to light green-grey hemispherical head on a conical or umbrella-like expansion that is embedded in the sand. [2] [3] It tends to grow up to 30 mm (1.2 in) tall and have a base with a circumference of up to 50 mm (2.0 in). [2] The head is rough and covered in lines of projecting spicules. These ...
McMurdo Station briefly gained global notice when an anti-war protest took place on February 15, 2003. During the rally, about 50 scientists and station personnel gathered to protest against the coming invasion of Iraq by the United States. McMurdo Station was the only Antarctic location to hold such a rally. [25]
The McMurdo Volcanic Group is a large group of Cenozoic volcanic rocks in the western Ross Sea and central Transantarctic Mountains areas of Antarctica. [1] It is one of the largest provinces of alkaline volcanism in the world, having formed as a result of continental rifting along the West Antarctic Rift System .
Red volcano sponge (Acarnus erithacus, Poecilosclerida). Spermatocytes develop from the transformation of choanocytes and oocytes arise from archeocytes . Repeated cleavage of the zygote egg takes place in the mesohyl and forms a parenchymella larva with a mass of larger internal cells surrounded by small, externally flagellated cells.
Haliclona caerulea takes the form of an encrusting mass of cylindrical to volcano-shaped projections between 2 and 15 cm, with oscula at the high end. The oscula are circular or oval, and between 1.3 and 5.0 mm in diameter. [2] The body has radial symmetry and consists, on the outside, of flattened cells known as pinacocytes.
McMurdo Sound experiences katabatic winds from the Antarctic polar plateau. McMurdo Sound freezes over with sea ice about 3 metres (9.8 ft) thick during the winter. During the austral summer when the pack ice breaks up, wind and currents may push the ice northward into the Ross Sea, stirring up cold bottom currents that spill into the ocean basins.
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