Information: - Titanosaurs (members of the group Titanosauria) were a diverse group of sauropod dinosaurs, which included "Saltasaurus" and "Isisaurus". When the extinction event at the end of the Cretaceous period occurred, they were the last surviving group of long-necked dinosaurs. The group includes some of the heaviest creatures ever to walk the earth, such as "Argentinosaurus" and "Puertasaurus", which are estimated to have weighed up to . The group's name refers to the much earlier discovery "Titanosaurus", a now dubious genus named for the mythological Titans of Ancient Greece. Together with the brachiosaurids and relatives, titanosaurs make up the larger clade Titanosauriformes. - Argentina, officially the Argentine Republic, is a federal republic in the southern half of South America. Sharing the bulk of the Southern Cone with its neighbor Chile to the west, the country 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. With a mainland area of , Argentina is the eighth-largest country in the world, the second largest in Latin America, and the largest Spanish-speaking one. The country is subdivided into twenty-three provinces (singular "provincia") and one autonomous city ("ciudad autonoma"), Buenos Aires, which is the federal capital of the nation as decided by Congress. The provinces and the capital have their own constitutions, but exist under a federal system. - The Paleogene (or ; also spelled Palaeogene or Palogene; informally Lower Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago (Mya) to the beginning of the Neogene Period Mya. It is the beginning of the Cenozoic Era of the present Phanerozoic Eon. The Paleogene is most notable for being the time during which mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of the CretaceousPaleogene extinction event that ended the preceding Cretaceous Period. - Salta is a city located in the Lerma Valley, at 1,152 metres (3780 feet) above sea level in the northwest part of Argentina. It is also the name for the capital city of Salta Province. Along with its metropolitan area, it has a population of 619,000 inhabitants, which makes it the second most populated city in the northwest of the country. - The TriassicJurassic extinction event marks the boundary between the Triassic and Jurassic periods, , and is one of the major extinction events of the Phanerozoic eon, profoundly affecting life on land and in the oceans. In the seas, a whole class (conodonts) and 34% of marine genera disappeared. On land, all pseudosuchians (non-ornithodiran archosaurs) other than crocodylomorphs (Sphenosuchia and Crocodyliformes), some remaining therapsids, and many of the large amphibians became extinct. - Binomial nomenclature (also called binominal nomenclature or binary nomenclature) is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin grammatical forms, although they can be based on words from other languages. Such a name is called a binomial name (which may be shortened to just "binomial"), a binomen or a scientific name; more informally it is also called a Latin name. The first part of the name identifies the genus to which the species belongs; the second part identifies the species within the genus. For example, humans belong to the genus "Homo" and within this genus to the species "Homo sapiens". The "formal" introduction of this system of naming species is credited to Carl Linnaeus, effectively beginning with his work "Species Plantarum" in 1753. But Gaspard Bauhin, in as early as 1623, had introduced in his book "Pinax theatri botanici" (English, "Illustrated exposition of plants") many names of genera that were later adopted by Linnaeus. - Belo Horizonte ("Beautiful Horizon") is the sixth largest city in Brazil, the thirteenth largest city in South America and the eighteenth largest city in the Americas. The metropolis is anchor to the Belo Horizonte metropolitan area, ranked as the third most populous metropolitan area in Brazil and the seventeenth most populous in the Americas. Belo Horizonte is the capital of the state of Minas Gerais, Brazil's second most populous state. It is the first planned modern city in Brazil. - Maxakalisaurus is a genus of aeolosaurid dinosaur , found in Brazil , 45 kilometers ( 28 miles ) from the city of Prata , in the state of Minas Gerais in 1998 . It was related to Saltasaurus , a sauropod considered unusual because it had evolved apparently defensive traits , including bony plates on its skin and vertical plates along its spine ; such osteoderms have also been found for Maxakalisaurus . The genus name is derived from the tribe of the Maxakali ; Topa is one of their divinities . The Maxakalisaurus fossils belonged to an animal about 13 meters ( 43 feet ) long , with an estimated weight of 9 tons , although , according to paleontologist Alexander Kellner , it could reach a length of approximately 20 meters ( 66 feet ) . It had a long neck and tail , ridged teeth ( unusual among sauropods ) and lived about 80 million years ago . Because sauropods seem to have lacked significant competition in South America , they evolved there with greater diversity and more unusual traits than elsewhere in the world . '' This is the biggest dinosaur yet described in Brazil , '' said Alexander Kellner , lead author of the scientific description . '' We have found the bones of what appear to be larger dinosaurs , but we still have n't been able to put them together for scientific descriptions . '' - Skin is the soft outer covering of vertebrates. Other animal coverings, such as the arthropod exoskeleton have different developmental origin, structure and chemical composition. The adjective cutaneous means "of the skin" (from Latin "cutis", skin). In mammals, the skin is an organ of the integumentary system made up of multiple layers of ectodermal tissue, and guards the underlying muscles, bones, ligaments and internal organs. Skin of a different nature exists in amphibians, reptiles, and birds. All mammals have some hair on their skin, even marine mammals like whales, dolphins, and porpoises which appear to be hairless. The skin interfaces with the environment and is the first line of defense from external factors. For example, the skin plays a key role in protecting the body against pathogens and excessive water loss. Its other functions are insulation, temperature regulation, sensation, and the production of vitamin D folates. Severely damaged skin may heal by forming scar tissue. This is sometimes discoloured and depigmented. The thickness of skin also varies from location to location on an organism. In humans for example, the skin located under the eyes and around the eyelids is the thinnest skin in the body at 0.5mm thick, and is one of the first areas to show signs of aging such as "crows feet" and wrinkles. The skin on the palms and the soles of the feet is 4mm thick and the back is 14mm thick and is the thickest skin in the body. The speed and quality of wound healing in skin is promoted by the reception of estrogen. - Brazil, officially the Federative Republic of Brazil, is the largest country in both South America and Latin America. As the world's fifth-largest country by both area and population, it is the largest country to have Portuguese as an official language and the only one in the Americas. Bounded by the Atlantic Ocean on the east, Brazil has a coastline of . It borders all other South American countries except Ecuador and Chile and covers 47.3% of the continent's land area. Its Amazon River basin includes a vast tropical forest, home to diverse wildlife, a variety of ecological systems, and extensive natural resources spanning numerous protected habitats. This unique environmental heritage makes Brazil one of 17 megadiverse countries, and is the subject of significant global interest and debate regarding deforestation and environmental protection. - Dinosaurs are a diverse group of animals of the clade Dinosauria that first appeared during the Triassic. Although the exact origin and timing of the evolution of dinosaurs is the subject of active research, the current scientific consensus places their origin between 231 and 243 million years ago. They became the dominant terrestrial vertebrates after the TriassicJurassic extinction event 201 million years ago. Their dominance continued through the Jurassic and Cretaceous periods and ended when the CretaceousPaleogene extinction event led to the extinction of most dinosaur groups 66 million years ago. - The Triassic is a geologic period and system which spans 50.9 million years from the end of the Permian Period million years ago (Mya), to the beginning of the Jurassic Period Mya. The Triassic is the first period of the Mesozoic Era. Both the start and end of the period are marked by major extinction events. The Triassic was named in 1834 by Friedrich von Alberti, after the three distinct rock layers ("tri" meaning "three") that are found throughout Germany and northwestern Europered beds, capped by marine limestone, followed by a series of terrestrial mud- and sandstonescalled the "Trias". - The Maxakali are an ethnic group of indigenous people in Brazil. - Minas Gerais is a state in the north of Southeastern Brazil. It ranks as the second most populous, the third by gross domestic product (GDP), and the fourth largest by area in the country. The state's capital and largest city, Belo Horizonte, is a major urban and finance center in Latin America, and is the sixth largest municipality in Brazil, after the cities of Sao Paulo, Rio de Janeiro, Salvador, Brasilia and Fortaleza, but its metropolitan area is the third largest in Brazil with just over 5,500,000 inhabitants, after those of Sao Paulo and Rio de Janeiro. Minas Gerais is the state with the largest number of Brazilian presidents. - A "metropolitan area", sometimes referred to as a "metro area" or just "metro", is a region consisting of a densely populated urban core and its less-populated surrounding territories, sharing industry, infrastructure, and housing. A metro area usually comprises multiple jurisdictions and municipalities: neighborhoods, townships, boroughs, cities, towns, exurbs, suburbs, counties, districts, states, and even nations like the eurodistricts. As social, economic and political institutions have changed, metropolitan areas have become key economic and political regions. Metropolitan areas include one or more urban areas, as well as satellite cities, towns and intervening rural areas that are socio-economically tied to the urban core, typically measured by commuting patterns. - Saltasaurus (which means "lizard from Salta") is a genus of titanosaurid sauropod dinosaur of the Late Cretaceous Period of Argentina. Small among sauropods, though still heavy by the standards of modern creatures, "Saltasaurus" was characterized by a short neck and stubby limbs. It was the first genus of sauropod known to possess armour of bony plates embedded in its skin. Such small bony plates, called osteoderms, have since been found on other titanosaurids. - The Jurassic (from Jura Mountains) is a geologic period and system that spans 56.3 million years from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period Mya. The Jurassic constitutes the middle period of the Mesozoic Era, also known as the Age of Reptiles. The start of the period is marked by the major TriassicJurassic extinction event. Two other extinction events occurred during the period: the Pliensbachian/Toarcian event in the Early Jurassic, and the Tithonian event at the end; however, neither event ranks among the "Big Five" mass extinctions. - Rio de Janeiro ("River of January"), or simply Rio, is the second-most populous municipality in Brazil and the sixth-most populous in the Americas. The metropolis is anchor to the Rio de Janeiro metropolitan area, the second-most populous metropolitan area in Brazil and sixth-most populous in the Americas. Rio de Janeiro is the capital of the state of Rio de Janeiro, Brazil's third-most populous state. Part of the city has been designated as a World Heritage Site, named ""Rio de Janeiro: Carioca Landscapes between the Mountain and the Sea"", by UNESCO on 1 July 2012 as a Cultural Landscape. - In biology, an organism is any contiguous living system, such as an animal, plant, fungus, archaeon, or bacterium. All known types of organisms are capable of some degree of response to stimuli, reproduction, growth and development and homeostasis. An organism consists of one or more cells; when it has one cell it is known as a unicellular organism; and when it has more than one it is known as a multicellular organism. Most unicellular organisms are of microscopic scale and are thus loosely described as microorganisms. Humans are multicellular organisms composed of many trillions of cells grouped into specialized tissues and organs. - Sao Paulo ("Saint Paul" in English) is a municipality located in the southeast region of Brazil. The metropolis is an alpha global cityas listed by the GaWCand is the most populous city in Brazil, the Americas, and in the Southern Hemisphere. The municipality is also Earth's 12th largest city proper by population. The city is the capital of the homonymous state of Sao Paulo, Brazil's most populous and wealthiest state. It exerts strong international influence in commerce, finance, arts and entertainment. The name of the city honors Saint Paul of Tarsus. The city's metropolitan area of Greater Sao Paulo ranks as the most populous in Brazil, the 11th most populous on Earth, and largest Portuguese-speaking city in the world. - The Cretaceous is a geologic period and system that spans 79 million years from the end of the Jurassic Period million years ago (Mya) to the beginning of the Paleogene Period Mya. It is the last period of the Mesozoic Era. The Cretaceous Period is usually abbreviated K, for its German translation "Kreide" (chalk). - A genus (genera) is a taxonomic rank used in the biological classification of living and fossil organisms in biology. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. Given the information, choose the subject and object entities that have the relation of 'parent taxon'.
A:
maxakalisaurus , titanosauria