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Sacabambaspis
''Sacabambaspis'' is an extinct genus of jawless fish that lived in the Ordovician period. ''Sacabambaspis'' lived in shallow waters on the continental margins of Gondwana. It is the best known arandaspid with many specimens. It is related to ''Arandaspis''. Description ''Sacabambaspis'' was approximately in length. The body shape of ''Sacabambaspis'' vaguely resembled that of a tadpole with an oversized head, flat body, wriggling tail, and lack of fins. It had characteristic, frontally positioned eyes, like car head lamps. Armor ''Sacabambaspis'' had a head shield made from a large upper (dorsal) plate that rose to a slight ridge in the midline, and a deep curved lower (ventral) plate, this headshield is ornamented with characteristic oak-leaf shaped or tear-drop shaped tubercles. Also it had narrow branchial plates which link these two along the sides, and cover the gill area. The eyes were far forward and between them are possibly two small nostrils and they, which are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sacabambaspis Janvieri Many Specimens
''Sacabambaspis'' is an extinct genus of jawless fish that lived in the Ordovician period. ''Sacabambaspis'' lived in shallow waters on the continental margins of Gondwana. It is the best known arandaspid with many specimens. It is related to ''Arandaspis''. Description ''Sacabambaspis'' was approximately in length. The body shape of ''Sacabambaspis'' vaguely resembled that of a tadpole with an oversized head, flat body, wriggling tail, and lack of fins. It had characteristic, frontally positioned eyes, like car head lamps. Armor ''Sacabambaspis'' had a head shield made from a large upper (dorsal) plate that rose to a slight ridge in the midline, and a deep curved lower (ventral) plate, this headshield is ornamented with characteristic oak-leaf shaped or tear-drop shaped tubercles. Also it had narrow branchial plates which link these two along the sides, and cover the gill area. The eyes were far forward and between them are possibly two small nostrils and they, which are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sacabambaspis
''Sacabambaspis'' is an extinct genus of jawless fish that lived in the Ordovician period. ''Sacabambaspis'' lived in shallow waters on the continental margins of Gondwana. It is the best known arandaspid with many specimens. It is related to ''Arandaspis''. Description ''Sacabambaspis'' was approximately in length. The body shape of ''Sacabambaspis'' vaguely resembled that of a tadpole with an oversized head, flat body, wriggling tail, and lack of fins. It had characteristic, frontally positioned eyes, like car head lamps. Armor ''Sacabambaspis'' had a head shield made from a large upper (dorsal) plate that rose to a slight ridge in the midline, and a deep curved lower (ventral) plate, this headshield is ornamented with characteristic oak-leaf shaped or tear-drop shaped tubercles. Also it had narrow branchial plates which link these two along the sides, and cover the gill area. The eyes were far forward and between them are possibly two small nostrils and they, which are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arandaspida
Arandaspida is a taxon of very early, jawless prehistoric fish which lived during the Ordovician period. Arandaspids represent the oldest known craniates, a proposed group of chordates that contain all chordates with a cartilage-derived skull (i.e., lampreys, armored agnathans, and gnathostomes), and hagfish. The group represents a subclass within the class Pteraspidomorphi, and contains only one order, the Arandaspidiformes. The oldest known genus of this group is ''Sacabambaspis'' found in South America. Characteristics The head armor of arandaspids is elongated, fusiform, with a rather flat dorsal shield, and a bulging ventral shield. In the anterior part of the dorsal shield are two closely set holes, which have been thought to be a paired pineal opening, but which are more likely the external openings of the endolymphatic ducts. The eyes, surrounded by a sclerotic ring, are housed in a notch at the anterior end of the dorsal shield. The nostrils are not clearly located, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anzaldo Formation
The Anzaldo Formation is a Katian geologic formation of central Bolivia. The formation belongs to the Cochabamba Group, overlies the Capinota Formation and is overlain by the San Benito Formation.Anzaldo Formation at .org Fossil content The formation has provided the following fossils:Fish ;Pteraspidomorphi * '' Huemacaspis bistrami''Emig & Herrera, 2006 * '' Sacabambaspis janvieri' ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arandaspis
''Arandaspis prionotolepis'' is an extinct species of jawless fish that lived in the Ordovician period, about 480 to 470 million years ago. Its remains were found in the Stairway Sandstone near Alice Springs, Australia in 1959, but it was not determined that they were the oldest known vertebrates until the late 1960s. ''Arandaspis'' is named after a local Aboriginal tribe, the Aranda (now currently called Arrernte). Description ''Arandaspis'' was about long, with a streamlined body covered in rows of knobbly armoured scutes. The front of the body and the head were protected by hard plates with openings for the eyes, nostrils and gills. It probably was a filter-feeder. It had no fins; its only method of propulsion was the use of its vertically flattened tail. As a result, it probably swam in a fashion similar to a modern tadpole A tadpole is the larval stage in the biological life cycle of an amphibian. Most tadpoles are fully aquatic, though some species of amphi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South America
South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the southern subregion of a single continent called America. South America is bordered on the west by the Pacific Ocean and on the north and east by the Atlantic Ocean; North America and the Caribbean Sea lie to the northwest. The continent generally includes twelve sovereign states: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay, and Venezuela; two dependent territories: the Falkland Islands and South Georgia and the South Sandwich Islands; and one internal territory: French Guiana. In addition, the ABC islands of the Kingdom of the Netherlands, Ascension Island (dependency of Saint Helena, Ascension and Tristan da Cunha, a British Overseas Territory), Bouvet Island ( dependency ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arabian Peninsula
The Arabian Peninsula, (; ar, شِبْهُ الْجَزِيرَةِ الْعَرَبِيَّة, , "Arabian Peninsula" or , , "Island of the Arabs") or Arabia, is a peninsula of Western Asia, situated northeast of Africa on the Arabian Plate. At , the Arabian Peninsula is the largest peninsula in the world. Geographically, the Arabian Peninsula includes Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, the United Arab Emirates (UAE), and Yemen, as well as the southern portions of Iraq and Jordan. The largest of these is Saudi Arabia. In the classical era, the southern portions of modern-day Syria, Jordan, and the Sinai Peninsula were also considered parts of Arabia (see Arabia Petraea). The Arabian Peninsula formed as a result of the rifting of the Red Sea between 56 and 23 million years ago, and is bordered by the Red Sea to the west and southwest, the Persian Gulf and the Gulf of Oman to the northeast, the Levant and Mesopotamia to the north and the Arabian Sea and the Indian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oman
Oman ( ; ar, عُمَان ' ), officially the Sultanate of Oman ( ar, سلْطنةُ عُمان ), is an Arabian country located in southwestern Asia. It is situated on the southeastern coast of the Arabian Peninsula, and spans the mouth of the Persian Gulf. Oman shares land borders with Saudi Arabia, the United Arab Emirates, and Yemen, while sharing maritime borders with Iran and Pakistan. The coast is formed by the Arabian Sea on the southeast, and the Gulf of Oman on the northeast. The Madha and Musandam exclaves are surrounded by the United Arab Emirates on their land borders, with the Strait of Hormuz (which it shares with Iran) and the Gulf of Oman forming Musandam's coastal boundaries. Muscat is the nation's capital and largest city. From the 17th century, the Omani Sultanate was an empire, vying with the Portuguese and British empires for influence in the Persian Gulf and Indian Ocean. At its peak in the 19th century, Omani influence and control extended ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cochabamba Department
Cochabamba ( ay, Quchapampa Jach'a Suyu, es, Departamento de Cochabamba , qu, Quchapampa Suyu), from Quechua ''qucha'' or ''qhucha'', meaning "lake", ''pampa'' meaning "plain", is one of the nine departments of Bolivia. It is known to be the " granary" of the country because of its variety of agricultural products from its geographical position. It has an area of 55,631 km2. Its population in the 2012 census was 1,758,143. Its capital is the city of Cochabamba, known as the "City of Eternal Spring" and "The Garden City" because of its spring-like temperatures all year. History The Cochabamba valley was inhabited for over a thousand years due to its fertile productive soils and climate. Archaeological evidence suggests that the initial valley inhabitants were of various ethnic indigenous groups. Tiwanaku, Tupuraya, Mojocoya, Omereque and Inca inhabited the valley at various times before the Spanish arrived. The first Spanish inhabitant of the Valley was Garci Ruiz de O ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argentina
Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourth-largest country in the Americas, and the List of countries and dependencies by area, eighth-largest country in the world. It shares the bulk of the Southern Cone with Chile to the west, and is also bordered by Bolivia and Paraguay to the north, Brazil to the northeast, Uruguay and the South Atlantic Ocean to the east, and the Drake Passage to the south. Argentina is a Federation, federal state subdivided into twenty-three Provinces of Argentina, provinces, and one autonomous city, which is the federal capital and List of cities in Argentina by population, largest city of the nation, Buenos Aires. The provinces and the capital have their own constitutions, but exist under a Federalism, federa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central Australia
Central Australia, also sometimes referred to as the Red Centre, is an inexactly defined region associated with the geographic centre of Australia. In its narrowest sense it describes a region that is limited to the town of Alice Springs and its immediate surrounds including the MacDonnell Ranges. In its broadest use it can include almost any region in inland Australia that has remained relatively undeveloped, and in this sense is synonymous with the term Outback. Centralia is another term associated with the area, most commonly used by locals. As described by Charles Sturt in one of the earlier uses of the term "A veil hung over Central Australia that could neither be pierced or raised. Girt round about by deserts, it almost appeared as if Nature had intentionally closed it upon civilized man, that she might have one domain on the earth's wide field over which the savage might roam in freedom." In a modern, more formal sense it can refer to the administrative region used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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