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Nacella Concinna
''Nacella concinna'' is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Nacellidae, one of the families of true limpets.Bouchet, P. (2014). Nacella polaris (Hombron & Jacquinot, 1841). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=713922 on 2015-01-26 Description The shell of ''Nacella concinna'' grows to about long with deep water specimens being rather smaller. It is an elongated ovate, moderately elevated cone with a low apex somewhat towards the anterior margin and angled in that direction. There are about 30 faint radial ribs and a series of fine concentric lines that indicate the annual growth rings. The exterior of the shell is varying shades of pale brown and grey and the interior is dark purplish-brown in deep water specimens but creamy-brown in those from shallow water. The mantle has a fringe of short tentacles. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a Symmetry in biology#Bilate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tierra Del Fuego
Tierra del Fuego (, ; Spanish for "Land of the Fire", rarely also Fireland in English) is an archipelago off the southernmost tip of the South American mainland, across the Strait of Magellan. The archipelago consists of the main island, Isla Grande de Tierra del Fuego, with an area of , and a group of many islands, including Cape Horn and Diego Ramírez Islands. Tierra del Fuego is divided between Chile and Argentina, with the latter controlling the eastern half of the main island and the former the western half plus the islands south of Beagle Channel and the southernmost islands. The southernmost extent of the archipelago is just north of latitude 56°S. The earliest known human settlement in Tierra del Fuego dates to approximately 8,000 BC. Europeans first explored the islands during Ferdinand Magellan's expedition of 1520. ''Tierra del Fuego'' and similar namings stem from sightings of the many bonfires that the natives built. Settlement by those of European descent and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petermann Island
Petermann Island is a small, low and rounded island, lying off the northwest coast of Kyiv Peninsula in Graham Land, Antarctica, a short distance south of Booth Island and the Lemaire Channel. It is a popular tourist destination. Description The island is long and across. It rises steeply to elevations of up to from a rocky coastline with raised pebble beaches. It has volcanic origins, with about half the land surface covered by a permanent, crevassed icecap. Ice-free areas have a sparse vegetation of mosses and lichens. The bedrock of the island is granodiorite, History The island was discovered by a German expedition of 1873–74, who named it after geographer August Petermann. The French Antarctic Expedition of 1908-10 wintered over aboard ship in a cove on the southeast side of the island, named Port Circumcision because it was spotted 1 January 1909, the traditional day for the Feast of the Circumcision. Huts built by the expedition are gone, although a cairn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anvers Island
Anvers Island or Antwerp Island or Antwerpen Island or Isla Amberes is a high, mountainous island long, the largest in the Palmer Archipelago of Antarctica. It was discovered by John Biscoe in 1832 and named in 1898 by the Belgian Antarctic Expedition under Adrien de Gerlache after the province of Antwerp in Belgium. It lies south-west of Brabant Island at the south-western end of the group. The south-western coastline of the island forms part of the Southwest Anvers Island and Palmer Basin Antarctic Specially Managed Area (ASMA 7). Cormorant Island, an Important Bird Area, lies 1 km off the south coast. Palmer Station The Palmer Station on Anvers Island is located at () and is Antarctica's only U.S. station north of the Antarctic Circle. Construction finished in 1968. Around 50 people can inhabit Palmer Station at one time. The station is named for Nathaniel B. Palmer, likely to have been one of the first three persons to see Antarctica. There are science labs in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wandel Island
Booth Island (or Wandel Island) is a rugged, Y-shaped island, long and rising to off the northwest coast of Kyiv Peninsula in Graham Land, Antarctica in the northeastern part of the Wilhelm Archipelago. The narrow passage between the island and the mainland is the Lemaire Channel. History The island was discovered and named by a German expedition under Eduard Dallmann 1873–74, probably for Oskar Booth or Stanley Booth, or both, members of the Hamburg Geographical Society at that time. The Belgian Antarctic Expedition of 1897–1899 applied the name "Wandel Island", for Danish polar explorer and hydrographer Carl Frederick Wandel, but the United States Advisory Committee on Antarctic Names rejected the name in favor of the earlier Booth Island. The name Wandel was retained for the island's highest point. Although many of the island's features were probably first seen by Dallmann's expedition, the island was not charted in detail until the Third French Antarctic Expediti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paulet Island
Paulet Island is a circular island about in diameter, lying south-east of Dundee Island, off the north-eastern end of the Antarctic Peninsula. Because of its large penguin colony, it is a popular destination for sightseeing tours. Description The island is composed of lava flows capped by a cinder cone with a small summit crater. Geothermal heat keeps parts of the island ice-free, and the youthful morphology of the volcano suggests that it was last active within the last 1,000 years. The island is part of the James Ross Island Volcanic Group. Historic monuments Paulet Island was discovered by a British expedition (1839–1843) under James Clark Ross and named by him for Captain the Right Honorable Lord George Paulet, Royal Navy. In 1903 during the Swedish Antarctic Expedition led by Otto Nordenskiöld his ship ''Antarctic'' was crushed and sunk by the ice off the coast of the island. A stone hut built in February 1903 by shipwreck survivors, together with the grave of an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seymour Island
Seymour Island or Marambio Island, is an island in the chain of 16 major islands around the tip of the Graham Land on the Antarctic Peninsula. Graham Land is the closest part of Antarctica to South America. It lies within the section of the island chain that resides off the west side of the peninsula's northernmost tip. Within that section, it is separated from Snow Hill Island by Picnic Passage, and sits just east of the larger key, James Ross Island, and its smaller, neighboring island, Vega Island. Seymour Island is sometimes called Marambio Island or Seymour-Marambio Island, taking its resident Argentine base as its namesake (see section, Base Antárctica Marambio, below). Historic site A wooden plaque and rock cairn stand at Penguins Bay, on the southern coast of Seymour Island. The plaque was placed on 10 November 1903 by the crew of the Argentinian Corvette ''Uruguay'' on a mission to rescue the members of the Swedish expedition led by Otto Nordenskiöld. The inscript ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bouvet Island
Bouvet Island ( ; or ''Bouvetøyen'') is an island claimed by Norway, and declared an uninhabited protected nature reserve. It is a subantarctic volcanic island, situated in the South Atlantic Ocean at the southern end of the Mid-Atlantic Ridge, making it the world's most remote island. It is not part of the southern region covered by the Antarctic Treaty System. The island lies north of the Princess Astrid Coast of Queen Maud Land, Antarctica, east of the South Sandwich Islands, south of Gough Island, and south-southwest of the coast of South Africa. It has an area of , 93 percent of which is covered by a glacier. The centre of the island is the ice-filled crater of an inactive volcano. Some skerries and one smaller island, Larsøya, lie along its coast. Nyrøysa, created by a rock slide in the late 1950s, is the only easy place to land and is the location of a weather station. The island was first spotted on 1 January 1739 by the Frenchman Jean-Baptiste Cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Shetlands
The South Shetland Islands are a group of Antarctic islands with a total area of . They lie about north of the Antarctic Peninsula, and between southwest of the nearest point of the South Orkney Islands. By the Antarctic Treaty of 1959, the islands' sovereignty is neither recognized nor disputed by the signatories and they are free for use by any signatory for non-military purposes. The islands have been claimed by the United Kingdom since 1908 and as part of the British Antarctic Territory since 1962. They are also claimed by the governments of Chile (since 1940, as part of the Antártica Chilena province) and Argentina (since 1943, as part of Argentine Antarctica, Tierra del Fuego Province). Several countries maintain research stations on the islands. Most of them are situated on King George Island, benefitting from the airfield of the Chilean base Eduardo Frei. There are sixteen research stations in different parts of the islands, with Chilean stations being ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Orkneys
The South Orkney Islands are a group of islands in the Southern Ocean, about north-east of the tip of the Antarctic Peninsula''Antarctica: Secrets of the Southern Continent'' p. 122 David McGonigal, 2009 and south-west of . They have a total area of about . The islands are claimed both by Britain (as part of the since 1962, previously as a [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Georgia Island
South Georgia ( es, Isla San Pedro) is an island in the South Atlantic Ocean that is part of the British Overseas Territory of South Georgia and the South Sandwich Islands. It lies around east of the Falkland Islands. Stretching in the east–west direction, South Georgia is around long and has a maximum width of . The terrain is mountainous, with the central ridge rising to at Mount Paget. The northern coast is indented with numerous bays and fjords, serving as good harbours. Discovered by Europeans in 1675, South Georgia had no indigenous population due to its harsh climate and remoteness. Captain James Cook in made the first landing, survey and mapping of the island, and on 17 January 1775 he claimed it a British possession, naming it "Isle of Georgia" after King George III. Through its history, it served as a whaling and seal hunting base, with intermittent population scattered in several whaling bases, the most important historically being Grytviken. The main settleme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antarctic Peninsula
The Antarctic Peninsula, known as O'Higgins Land in Chile and Tierra de San Martín in Argentina, and originally as Graham Land in the United Kingdom and the Palmer Peninsula in the United States, is the northernmost part of mainland Antarctica. The Antarctic Peninsula is part of the larger peninsula of West Antarctica, protruding from a line between Cape Adams (Weddell Sea) and a point on the mainland south of the Eklund Islands. Beneath the ice sheet that covers it, the Antarctic Peninsula consists of a string of bedrock islands; these are separated by deep channels whose bottoms lie at depths considerably below current sea level. They are joined by a grounded ice sheet. Tierra del Fuego, the southernmost tip of South America, is about away across the Drake Passage. The Antarctic Peninsula is in area and 80% ice-covered. The marine ecosystem around the western continental shelf of the Antarctic Peninsula (WAP) has been subjected to rapid climate change. Over the past 50 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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