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110-574: Saltasauridae (named after the Salta region of Argentina where they were first found) is a family of armored herbivorous sauropods from the Upper Cretaceous . They are known from fossils found in South America , Africa , Asia , North America , and Europe . They are characterized by their vertebrae and feet, which are similar to those of Saltasaurus , the first of the group to be discovered and

220-446: A t e s {\displaystyle n.states} , c i occupies a range from 1 to ( n . s t a t e s − 1 ) / ( n . t a x a − ⌈ n . t a x a / n . s t a t e s ⌉ ) {\displaystyle (n.states-1)/(n.taxa-\lceil n.taxa/n.states\rceil )} . The retention index (RI)

330-445: A metric to measure how consistent a candidate cladogram is with the data. Most cladogram algorithms use the mathematical techniques of optimization and minimization. In general, cladogram generation algorithms must be implemented as computer programs, although some algorithms can be performed manually when the data sets are modest (for example, just a few species and a couple of characteristics). Some algorithms are useful only when

440-760: A middle power in international affairs. A major non-NATO ally of the United States, Argentina is a developing country with the second-highest HDI (human development index) in Latin America after Chile . It maintains the second-largest economy in South America, and is a member of G-15 and G20 . Argentina is also a founding member of the United Nations , World Bank , World Trade Organization , Mercosur , Community of Latin American and Caribbean States and

550-537: A character in a phylogenetic analysis as they do not contribute anything to our understanding of relationships. However, homoplasy is often not evident from inspection of the character itself (as in DNA sequence, for example), and is then detected by its incongruence (unparsimonious distribution) on a most-parsimonious cladogram. Note that characters that are homoplastic may still contain phylogenetic signal . A well-known example of homoplasy due to convergent evolution would be

660-412: A cladogram can be roughly categorized as either morphological (synapsid skull, warm blooded, notochord , unicellular, etc.) or molecular (DNA, RNA, or other genetic information). Prior to the advent of DNA sequencing, cladistic analysis primarily used morphological data. Behavioral data (for animals) may also be used. As DNA sequencing has become cheaper and easier, molecular systematics has become

770-643: A clandestine organization. José López Rega organized the Argentine Anticommunist Alliance (AAA) to fight against them and the People's Revolutionary Army (ERP). Perón died in July 1974 and was succeeded by his wife, who signed a secret decree empowering the military and the police to "annihilate" the left-wing subversion, stopping ERP's attempt to start a rural insurgence in Tucumán province. Isabel Perón

880-667: A critical role in the party, died of cancer in 1952. As the economy continued to tank, Perón started losing popular support, and came to be seen as a threat to the national process. The Navy took advantage of Perón's withering political power, and bombed the Plaza de Mayo in 1955. Perón survived the attack, but a few months later, during the Liberating Revolution coup, he was deposed and went into exile in Spain. The new head of State, Pedro Eugenio Aramburu , proscribed Peronism and banned

990-422: A dataset, the degree to which each character carries phylogenetic information, and the fashion in which additive characters are coded, rendering it unfit for purpose. c i occupies a range from 1 to 1/[ n.taxa /2] in binary characters with an even state distribution; its minimum value is larger when states are not evenly spread. In general, for a binary or non-binary character with n . s t

1100-440: A diet of conifers , cycads , and early species of grasses . Unable to chew and probably lacking gastroliths , sauropods survived by retaining plant matter in their stomachs for long periods of time, fermenting it to extract as many resources as possible. Their long necks allowed them to graze over a large area while standing, reducing energy use. The osteoderms of Saltasaurus consisted of numerous, large bony plates embedded in

1210-458: A final heart attack on Monday, 1 July 1974, and died at 13:15. He was 78 years old. After his death, Isabel Perón , his wife and vice president, succeeded him in office. During her presidency, a military junta, along with the Peronists' far-right fascist faction, once again became the de facto head of state . Isabel Perón served as President of Argentina from 1974 until 1976, when she was ousted by

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1320-457: A larger clade. The incongruence length difference test (ILD) is a measurement of how the combination of different datasets (e.g. morphological and molecular, plastid and nuclear genes) contributes to a longer tree. It is measured by first calculating the total tree length of each partition and summing them. Then replicates are made by making randomly assembled partitions consisting of the original partitions. The lengths are summed. A p value of 0.01

1430-547: A left-wing Peronist, who took office on 25 May 1973. A month later, in June, Perón returned from Spain. One of Cámpora's first presidential actions was to grant amnesty to members of organizations that had carried out political assassinations and terrorist attacks, and to those who had been tried and sentenced to prison by judges. Cámpora's months-long tenure in government was beset by political and social unrest. Over 600 social conflicts, strikes , and factory occupations took place within

1540-662: A military coup d'état led by General Arturo Rawson toppled the democratically elected government of Ramón Castillo . Under pressure from the United States, later Argentina declared war on the Axis Powers (on 27 March 1945, roughly a month before the end of World War II in Europe ). During the Rawson dictatorship a relatively unknown military colonel named Juan Perón was named head of the Labour Department. Perón quickly managed to climb

1650-452: A more and more popular way to infer phylogenetic hypotheses. Using a parsimony criterion is only one of several methods to infer a phylogeny from molecular data. Approaches such as maximum likelihood , which incorporate explicit models of sequence evolution, are non-Hennigian ways to evaluate sequence data. Another powerful method of reconstructing phylogenies is the use of genomic retrotransposon markers , which are thought to be less prone to

1760-751: A part of Antarctica . The earliest recorded human presence in modern-day Argentina dates back to the Paleolithic period. The Inca Empire expanded to the northwest of the country in Pre-Columbian times. The country has its roots in Spanish colonization of the region during the 16th century. Argentina rose as the successor state of the Viceroyalty of the Río de la Plata , a Spanish overseas viceroyalty founded in 1776. The declaration and fight for independence (1810–1818)

1870-557: A proposal known as the Inca plan of 1816, which proposed that the United Provinces of the Río de la Plata (Present Argentina) should be a monarchy, led by a descendant of the Inca . Juan Bautista Túpac Amaru (half-brother of Túpac Amaru II ) was proposed as monarch. Some examples of those who supported this proposal were Manuel Belgrano , José de San Martín and Martín Miguel de Güemes . The Congress of Tucumán finally decided to reject

1980-610: A second term . With the economy beginning to decline in 1995, and with increasing unemployment and recession, the UCR, led by Fernando de la Rúa , returned to the presidency in the 1999 elections . De la Rúa left Menem's economic plan in effect despite the worsening crisis, which led to growing social discontent. Massive capital flight from the country was responded to with a freezing of bank accounts , generating further turmoil. The December 2001 riots forced him to resign. Congress appointed Eduardo Duhalde as acting president, who revoked

2090-485: A similar manner. The same Argentine dig site, Auca Mahuevo, that provided information on embryonic skin, has also yielded information on the nesting habits of titanosaurs, but not saltasaurids specifically. The nests were constructed on the surface by piling debris in a ring around the eggs, with the eggs themselves left uncovered. Each egg was porous and spherical, about 14 cm in diameter, and they were laid in clutches. The embryos show smaller rostrum and nares close to

2200-462: A single month. Even though far-left terrorist organisations had suspended their armed struggle, their joining with the participatory democracy process was interpreted as a direct threat by the Peronist right-wing faction. Amid a state of political, social, and economic upheaval, Cámpora and Vice President Vicente Solano Lima resigned in July 1973, calling for new elections, but this time with Perón as

2310-414: A system of social assistance for the most vulnerable sectors of society. The economy began to decline in 1950 due in part to government expenditures and the protectionist economic policies. He also engaged in a campaign of political suppression. Anyone who was perceived to be a political dissident or potential rival was subject to threats, physical violence and harassment. The Argentine intelligentsia ,

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2420-607: Is a federal state subdivided into twenty-three provinces , and one autonomous city , which is the federal capital and largest city of the nation, Buenos Aires . The provinces and the capital have their own constitutions, but exist under a federal system . Argentina claims sovereignty over the Falkland Islands , South Georgia and the South Sandwich Islands , the Southern Patagonian Ice Field , and

2530-410: Is a character state that is shared by two or more taxa due to some cause other than common ancestry. The two main types of homoplasy are convergence (evolution of the "same" character in at least two distinct lineages) and reversion (the return to an ancestral character state). Characters that are obviously homoplastic, such as white fur in different lineages of Arctic mammals, should not be included as

2640-411: Is obtained for 100 replicates if 99 replicates have longer combined tree lengths. Some measures attempt to measure the amount of homoplasy in a dataset with reference to a tree, though it is not necessarily clear precisely what property these measures aim to quantify The consistency index (CI) measures the consistency of a tree to a set of data – a measure of the minimum amount of homoplasy implied by

2750-621: Is unclear when and where the evolution of osteoderms occurred in saltasaurids and titanosaurs in general. The first saltasaurid to be discovered was Alamosaurus , found by paleontologist Charles Gilmore in Utah in 1922. The next species would not be described until Opisthocoelicaudia was named by Magdalena Borsuk-Bialynicka from a postcranial material in Mongolia in 1977. In 1980, Jose Bonaparte and Jaime Powell discovered Saltasaurus in Argentina . This

2860-526: Is usually done by comparison to the character states of one or more outgroups . States shared between the outgroup and some members of the in-group are symplesiomorphies; states that are present only in a subset of the in-group are synapomorphies. Note that character states unique to a single terminal (autapomorphies) do not provide evidence of grouping. The choice of an outgroup is a crucial step in cladistic analysis because different outgroups can produce trees with profoundly different topologies. A homoplasy

2970-618: The Cordobazo and the Rosariazo . The terrorist guerrilla organization Montoneros kidnapped and executed Aramburu. The newly chosen head of government, Alejandro Agustín Lanusse , seeking to ease the growing political pressure, allowed Héctor José Cámpora to become the Peronist candidate instead of Perón. Cámpora won the March 1973 election , issued pardons for condemned guerrilla members, and then secured Perón's return from his exile in Spain. On

3080-614: The Bombing of Plaza de Mayo in 1955. The Trelew massacre of 1972, the actions of the Argentine Anticommunist Alliance commencing in 1973, and Isabel Perón 's "annihilation decrees" against left-wing guerrillas during Operativo Independencia (Operation Independence) in 1975, are also possible events signaling the beginning of the Dirty War. Onganía shut down Congress, banned all political parties, and dismantled student and worker unions. In 1969, popular discontent led to two massive protests:

3190-710: The Centralists and the Federalists —a move that would define Argentina's first decades of independence. The Assembly of the Year XIII appointed Gervasio Antonio de Posadas as Argentina's first Supreme Director . On 9 July 1816, the Congress of Tucumán formalized the Declaration of Independence , which is now celebrated as Independence Day, a national holiday. One year later General Martín Miguel de Güemes stopped royalists on

3300-685: The Charrúa , Minuane and Guaraní in the northeast, with slash and burn semisedentary existence; the advanced Diaguita sedentary trading culture in the northwest, which was conquered by the Inca Empire around 1480; the Toconoté and Hênîa and Kâmîare in the country's centre, and the Huarpe in the centre-west, a culture that raised llama cattle and was strongly influenced by the Incas. Europeans first arrived in

3410-567: The Laborioust candidate. The Labour Party (later renamed Justicialist Party ), the most powerful and influential party in Argentine history, came into power with the rise of Juan Perón to the presidency in 1946. He nationalized strategic industries and services, improved wages and working conditions, paid the full external debt and claimed he achieved nearly full employment . He pushed Congress to enact women's suffrage in 1947, and developed

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3520-500: The Macri Government introduced neoliberal austerity measures intended to tackle inflation and overblown public deficits. Under Macri's administration, economic recovery remained elusive with GDP shrinking 3.4%, inflation totaling 240%, billions of US dollars issued in sovereign debt, and mass poverty increasing by the end of his term. He ran for re-election in 2019 but lost by nearly eight percentage points to Alberto Fernández ,

3630-575: The Organization of Ibero-American States . The description of the region by the word Argentina has been found on a Venetian map in 1536. In English, the name Argentina comes from the Spanish language ; however, the naming itself is not Spanish, but Italian . Argentina ( masculine argentino ) means in Italian '(made) of silver, silver coloured', derived from the Latin argentum for silver. In Italian,

3740-562: The Southern Cone . The Dirty War involved state terrorism in Argentina and elsewhere in the Southern Cone against political dissidents, with military and security forces employing urban and rural violence against left-wing guerrillas, political dissidents, and anyone believed to be associated with socialism or somehow contrary to the neoliberal economic policies of the regime. Victims of

3850-565: The Spanish Empire , and " United Provinces of the Río de la Plata " after independence. The 1826 constitution included the first use of the name "Argentine Republic" in legal documents. The name "Argentine Confederation" was also commonly used and was formalized in the Argentine Constitution of 1853 . In 1860 a presidential decree settled the country's name as "Argentine Republic", and that year's constitutional amendment ruled all

3960-645: The absolutist monarchy that ruled the country. As in the rest of Spanish America, the overthrow of Ferdinand VII during the Peninsular War created great concern. Beginning a process from which Argentina was to emerge as successor state to the Viceroyalty, the 1810 May Revolution replaced the viceroy Baltasar Hidalgo de Cisneros with the First Junta , a new government in Buenos Aires made up from locals. In

4070-509: The neo-Keynesian economic policies laid by Duhalde, Kirchner ended the economic crisis attaining significant fiscal and trade surpluses, and rapid GDP growth. Under his administration, Argentina restructured its defaulted debt with an unprecedented discount of about 70% on most bonds, paid off debts with the International Monetary Fund , purged the military of officers with dubious human rights records, nullified and voided

4180-580: The second-largest country in South America after Brazil , the fourth-largest country in the Americas , and the 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

4290-521: The 1916 election . He enacted social and economic reforms and extended assistance to small farms and businesses. Argentina stayed neutral during World War I . The second administration of Yrigoyen faced an economic crisis, precipitated by the Great Depression . In 1930, Yrigoyen was ousted from power by the military led by José Félix Uriburu . Although Argentina remained among the fifteen richest countries until mid-century, this coup d'état marks

4400-529: The Falkland Islands . The United Kingdom dispatched a task force to regain possession. Argentina surrendered on 14 June and its forces were taken home. Street riots in Buenos Aires followed the humiliating defeat and the military leadership stood down. Reynaldo Bignone replaced Galtieri and began to organize the transition to democratic governance. Raúl Alfonsín won the 1983 elections campaigning for

4510-531: The Full Stop and Due Obedience laws, ruled them as unconstitutional, and resumed legal prosecution of the Junta's crimes. He did not run for reelection, promoting instead the candidacy of his wife, senator Cristina Fernández de Kirchner , who was elected in 2007 and reelected in 2011 . Fernández de Kirchner's administration established positive foreign relations with countries such as Venezuela, Iran, and Cuba, while at

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4620-653: The Inca plan, creating instead a republican, centralist state. The 1820 Battle of Cepeda , fought between the Centralists and the Federalists, resulted in the end of the Supreme Director rule . In 1826 Buenos Aires enacted another centralist constitution , with Bernardino Rivadavia being appointed as the first president of the country. However, the interior provinces soon rose against him, forced his resignation and discarded

4730-721: The Justicialist Party candidate. President Alberto Fernández and Vice President Cristina Fernández de Kirchner took office in December 2019, just months before the COVID-19 pandemic hit Argentina and among accusations of corruption , bribery and misuse of public funds during Nestor and Cristina Fernández de Kirchner's presidencies . On 14 November 2021, the center-left coalition of Argentina's ruling Peronist party, Frente de Todos (Front for Everyone), lost its majority in Congress, for

4840-546: The Justicialist Party nominee. Perón won the election with his wife Isabel Perón as vice president. Perón's third term was marked by escalating conflict between left and right-wing factions within the Peronist party, as well as the return of armed terror guerrilla groups such as the Guevarist ERP , leftist Peronist Montoneros , and the state-backed far-right Triple A . After a series of heart attacks and signs of pneumonia in 1974, Perón's health deteriorated quickly. He suffered

4950-536: The Peronist Carlos Menem won the 1989 election . Soon after, riots forced Alfonsín to an early resignation . Menem embraced and enacted neoliberal policies: a fixed exchange rate , business deregulation , privatizations , and the dismantling of protectionist barriers normalized the economy in the short term. He pardoned the officers who had been sentenced during Alfonsín's government. The 1994 Constitutional Amendment allowed Menem to be elected for

5060-472: The Saltasauridae in 2003 as the least inclusive clade containing Opisthocoelicaudia skarzynskii , and Saltasaurus loricatus , their most recent common ancestor, and all that species’ descendants. This taxonomy is based on those of González Riga et al. (2009) and Curry Rogers & Wilson (2005). The family is then further divided into two subfamilies. Wilson and Upchurch defined Saltasaurinae in 2003 as

5170-488: The United States government during the Johnson , Nixon , Ford , Carter , and Reagan administrations. The exact chronology of the repression is still debated, yet the roots of the long political war may have started in 1969 when trade unionists were targeted for assassination by Peronist and Marxist paramilitaries. Individual cases of state-sponsored terrorism against Peronism and the left can be traced back even further to

5280-562: The United States'—led to a near-reinvention of Argentine society and economy that by 1908 had placed the country as the seventh wealthiest developed nation in the world. Driven by this immigration wave and decreasing mortality, the Argentine population grew fivefold and the economy 15-fold: from 1870 to 1910, Argentina's wheat exports went from 100,000 to 2,500,000 t (110,000 to 2,760,000 short tons) per year, while frozen beef exports increased from 25,000 to 365,000 t (28,000 to 402,000 short tons) per year, placing Argentina as one of

5390-589: The adjective or the proper noun is often used in an autonomous way as a substantive and replaces it and it is said l'Argentina . The name Argentina was probably first given by the Venetian and Genoese navigators, such as Giovanni Caboto . In Spanish and Portuguese, the words for 'silver' are respectively plata and prata and '(made) of silver' is plateado and prateado , although argento for 'silver' and argentado for 'covered in silver' exist in Spanish. Argentina

5500-548: The allegiance of escaped Filipinos in San Blas who defected from the Spanish to join the Argentine navy, due to common Argentine and Philippine grievances against Spanish colonization. Jose de San Martin's brother, Juan Fermín de San Martín , was already in the Philippines and drumming up revolutionary fervor prior to this. At a later date, the Argentine sign of Inca origin, the Sun of May

5610-558: The anterior portion of the face compared to adult titanosaurs, suggesting that the nostrils may have moved towards the back of the head as the animal grew. [REDACTED] [REDACTED] [REDACTED] [REDACTED] [REDACTED] [REDACTED] [REDACTED] Argentina Argentina , officially the Argentine Republic , is a country in the southern half of South America . Argentina covers an area of 2,780,400 km (1,073,500 sq mi), making it

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5720-453: The area now known as Argentina are dated from the Paleolithic period, with further traces in the Mesolithic and Neolithic . Until the period of European colonization, Argentina was relatively sparsely populated by a wide number of diverse cultures with different social organizations, which can be divided into three main groups. The first group are basic hunters and food gatherers without

5830-514: The border, and the appropriation of the indigenous territories. The first conquest consisted of a series of military incursions into the Pampa and Patagonian territories dominated by the indigenous peoples, distributing them among the members of the Sociedad Rural Argentina , financiers of the expeditions. The conquest of Chaco lasted up to the end of the century, since its full ownership of

5940-431: The character, "presence of wings". Although the wings of birds, bats , and insects serve the same function, each evolved independently, as can be seen by their anatomy . If a bird, bat, and a winged insect were scored for the character, "presence of wings", a homoplasy would be introduced into the dataset, and this could potentially confound the analysis, possibly resulting in a false hypothesis of relationships. Of course,

6050-601: The characteristic body plan of a small head, long neck, four erect legs, and a counterbalancing tail. Most sauropods are from the clade Neosauropoda , which is further split into the narrow-toothed Diplodocoidea and the broad-toothed Macronaria . The Macronarians emerged in the Jurassic and a subclade, the Titanosauria , survived into the Cretaceous and spread across the continents. Because of their diversity, wide distribution, and

6160-434: The characteristic data are molecular (DNA, RNA); other algorithms are useful only when the characteristic data are morphological. Other algorithms can be used when the characteristic data includes both molecular and morphological data. Algorithms for cladograms or other types of phylogenetic trees include least squares , neighbor-joining , parsimony , maximum likelihood , and Bayesian inference . Biologists sometimes use

6270-444: The constitution. Centralists and Federalists resumed the civil war; the latter prevailed and formed the Argentine Confederation in 1831, led by Juan Manuel de Rosas . During his regime he faced a French blockade (1838–1840), the War of the Confederation (1836–1839), and an Anglo-French blockade (1845–1850), but remained undefeated and prevented further loss of national territory. His trade restriction policies, however, angered

6380-437: The country was slow to meet its original goals of industrialization: after the steep development of capital-intensive local industries in the 1920s, a significant part of the manufacturing sector remained labour-intensive in the 1930s. Between 1878 and 1884, the so-called Conquest of the Desert occurred, with the purpose of tripling the Argentine territory by means of the constant confrontations between natives and Criollos in

6490-595: The dataset). The rescaled consistency index (RC) is obtained by multiplying the CI by the RI; in effect this stretches the range of the CI such that its minimum theoretically attainable value is rescaled to 0, with its maximum remaining at 1. The homoplasy index (HI) is simply 1 − CI. This measures the amount of homoplasy observed on a tree relative to the maximum amount of homoplasy that could theoretically be present – 1 − (observed homoplasy excess) / (maximum homoplasy excess). A value of 1 indicates no homoplasy; 0 represents as much homoplasy as there would be in

6600-407: The day Perón returned to Argentina, the clash between Peronist internal factions— right-wing union leaders and left-wing youth from the Montoneros—resulted in the Ezeiza Massacre . Overwhelmed by political violence, Cámpora resigned and Perón won the following September 1973 election with his third wife Isabel as vice-president. He expelled Montoneros from the party and they became once again

6710-402: The development of pottery , such as the Selk'nam and Yaghan in the extreme south. The second group are advanced hunters and food gatherers which include the Puelche , Querandí and Serranos in the centre-east; and the Tehuelche in the south—all of them conquered by the Mapuche spreading from Chile —and the Kom and Wichi in the north. The last group are farmers with pottery, such as

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6820-513: The dorsal skin, each surrounded by a pattern of smaller plates. The large osteoderms contained some hollow spaces for blood vessels and spongy trabecular bone, while the small ones were solid. Patches of skin from unidentified Cretaceous titanosaurs have revealed similar scale patterns in embryos (a large scale surrounded by ten smaller ones) but no bone or mineralized structure, suggesting that, like crocodiles, those saltasaurids that possessed armor only developed it some time after hatching. Analysis of

6930-478: The family in territories as widely dispersed as today's Australia , Madagascar , and France , in addition to their earlier-known residencies in North and South America. Like the other titanosaurs, the saltasaurids where a widespread, successful group that colonized all continents in the Cretaceous. Like all titanosaurs, the saltasaurids possessed small, peg-like teeth that were not usable for chewing. Coproliths from an unidentified titanosaur found in India suggest

7040-404: The first ballotage in Argentina's history, beating Front for Victory candidate Daniel Scioli and becoming president-elect. Macri was the first democratically elected non- peronist president since 1916 that managed to complete his term in office without being overthrown. He took office on 10 December 2015 and inherited an economy with a high inflation rate and in a poor shape. In April 2016,

7150-415: The first clashes of the Independence War the Junta crushed a royalist counter-revolution in Córdoba , but failed to overcome those of the Banda Oriental , Upper Peru and Paraguay , which later became independent states. The French-Argentine Hippolyte Bouchard then brought his fleet to wage war against Spain overseas and attacked Spanish California , Spanish Peru and Spanish Philippines . He secured

7260-439: The first time in almost 40 years, in midterm legislative elections . The election victory of the center-right coalition, Juntos por el Cambio (Together for Change) limited President Alberto Fernandez's power during his final two years in office. Losing control of the Senate made it difficult for him to make key appointments, including to the judiciary. It also forced him to negotiate with the opposition every initiative he sends to

7370-424: The fixed exchange rate established by Menem, causing many working- and middle-class Argentines to lose a significant portion of their savings. By late 2002, the economic crisis began to recede, but the assassination of two piqueteros by the police caused political unrest, prompting Duhalde to move elections forward. Néstor Kirchner was elected as the new president . On 26 May 2003, he was sworn in. Boosting

7480-423: The fragmentary or incomplete nature of most specimens, little is known about the titanosaurs beyond their size and tendency to have scutes. The saltasaurids, one of the several titanosaur families, are recognized by the convexities in certain caudal vertebrae and the markings on their coracoid bones. All saltasaurids have thirty-five or fewer caudal vertebrae, each of which is convex on both sides of its centrum, and

7590-435: The government after elected labour movement officials were forcefully replaced by Peronist puppets from the Peronist Party . Reyes was soon arrested on charges of terrorism, though the allegations were never substantiated. Reyes, who was never formally charged, was tortured in prison for five years and only released after the regime's downfall in 1955. Perón managed to get re-elected in 1951 . His wife Eva Perón , who played

7700-405: The ground, and their small heads had only tiny, peg-like teeth. They were herbivorous , stripping leaves off of plants and digesting them in their enormous guts. Although large animals, they were smaller than other sauropods of their time, and many possessed distinctive additional defenses in the form of scutes along their backs. As sauropods, the Saltasauridae are herbivorous saurischians with

7810-448: The interior provinces and in 1852 Justo José de Urquiza , another powerful caudillo , beat him out of power . As the new president of the Confederation, Urquiza enacted the liberal and federal 1853 Constitution. Buenos Aires seceded but was forced back into the Confederation after being defeated in the 1859 Battle of Cepeda . Overpowering Urquiza in the 1861 Battle of Pavón , Bartolomé Mitre secured Buenos Aires' predominance and

7920-665: The least-inclusive clade containing Saltasaurus but not Opisthocoelicaudia . The same paleontologists defined Opisthocoelicaudiinae as the inverse: the least-inclusive clade containing Opisthocoelicaudia but not Saltasaurus . Some species, due to the incompleteness of their skeletons, cannot yet be placed in either subfamily. Saltasauridae in a cladogram after Navarro et al ., 2022: Opisthocoelicaudia Nemegtosaurus Alamosaurus Baurutitan Ibirania Bonatitan Rocasaurus Neuquensaurus MACN-PV-RN 233 Saltasaurus Many fragmentary saltasaurids have been discovered since 1980, placing members of

8030-596: The left-wing. By the end of 1976, the Montoneros had lost nearly 2,000 members and by 1977, the ERP was completely subdued. Nevertheless, the severely weakened Montoneros launched a counterattack in 1979, which was quickly put down, effectively ending the guerrilla threat and securing the junta's position in power. In March 1982, an Argentine force took control of the British territory of South Georgia and, on 2 April, Argentina invaded

8140-478: The legislature. In April 2023, President Alberto Fernandez announced that he will not seek re-election in the next presidential election . The 19 November 2023 election run-off vote ended in a win for libertarian outsider Javier Milei with close to 56% of the vote against 44% of the ruling coalition candidate Sergio Massa . On 10 December 2023, Javier Milei was sworn in as the new president of Argentina. Cladogram The characteristics used to create

8250-418: The middle-class, university students, and professors were seen as particularly troublesome. Perón fired over 2,000 university professors and faculty members from all major public education institutions. Perón tried to bring most trade and labour unions under his thumb, regularly resorting to violence when needed. For instance, the meat-packers union leader, Cipriano Reyes , organized strikes in protest against

8360-408: The military. Her short presidency was marked by the collapse of Argentine political and social systems, leading to a constitutional crisis that paved the way for a decade of instability, left-wing terrorist guerrilla attacks, and state-sponsored terrorism. The "Dirty War" (Spanish: Guerra Sucia ) was part of Operation Condor , which included the participation of other right-wing dictatorships in

8470-417: The names since 1810 as legally valid. In English , the country was traditionally called "the Argentine", mimicking the typical Spanish usage la Argentina and perhaps resulting from a mistaken shortening of the fuller name 'Argentine Republic'. 'The Argentine' fell out of fashion during the mid-to-late 20th century, and now the country is referred to as "Argentina". The earliest traces of human life in

8580-498: The national economic system only took place when the mere extraction of wood and tannin was replaced by the production of cotton . The Argentine government considered indigenous people as inferior beings, without the same rights as Criollos and Europeans. In 1912, President Roque Sáenz Peña enacted universal and secret male suffrage , which allowed Hipólito Yrigoyen , leader of the Radical Civic Union (or UCR), to win

8690-496: The north, and General José de San Martín . He joined Bernardo O'Higgins and they led a combined army across the Andes and secured the independence of Chile; then it was sent by O'Higgins orders to the Spanish stronghold of Lima and proclaimed the independence of Peru . In 1819 Buenos Aires enacted a centralist constitution that was soon abrogated by federalists. Some of the most important figures of Argentine independence made

8800-426: The one closest to the tail is shorter than the others. Their coracoid bones have rectangular margins on the anteroventral side, as well as a lip where they meet the infraglenoid . The Opisthocoelicaudiinae , a subfamily of the saltasaurids, are unique in that they lack phalanges in their forelimbs. Although Saltasaurus is known to possess dorsal osteoderms, scutes have not been discovered in all saltasaurids, and it

8910-705: The only reason a homoplasy is recognizable in the first place is because there are other characters that imply a pattern of relationships that reveal its homoplastic distribution. A cladogram is the diagrammatic result of an analysis, which groups taxa on the basis of synapomorphies alone. There are many other phylogenetic algorithms that treat data somewhat differently, and result in phylogenetic trees that look like cladograms but are not cladograms. For example, phenetic algorithms, such as UPGMA and Neighbor-Joining, group by overall similarity, and treat both synapomorphies and symplesiomorphies as evidence of grouping, The resulting diagrams are phenograms, not cladograms, Similarly,

9020-407: The osteoderms of the titanosaur Rapetosaurus revealed that the bones were hollow in adults, while those of juveniles were solid pieces similar to those in crocodiles. Paleontologist Kristina Curry Rogers , who made this discovery, theorized that the adult animals used their hollow osteoderms to store minerals during lean times. It is unknown whether any of the Saltasauridae used their osteoderms in

9130-445: The party from any future elections. Arturo Frondizi from the UCR won the 1958 general election . He encouraged investment to achieve energetic and industrial self-sufficiency, reversed a chronic trade deficit and lifted the ban on Peronism; yet his efforts to stay on good terms with both the Peronists and the military earned him the rejection of both and a new coup forced him out. Amidst

9240-417: The political ladder, being named Minister of Defence by 1944. Being perceived as a political threat by rivals in the military and the conservative camp, he was forced to resign in 1945, and was arrested days later. He was finally released under mounting pressure from both his base and several allied unions. He would later become president after a landslide victory over the UCR in the 1946 general election as

9350-414: The political turmoil, Senate leader José María Guido reacted swiftly and applied anti- power vacuum legislation, ascending to the presidency himself; elections were repealed and Peronism was prohibited once again. Arturo Illia was elected in 1963 and led an increase in prosperity across the board; however he was overthrown in 1966 by another military coup d'état led by General Juan Carlos Onganía in

9460-523: The presidency, before being overthrown in 1976 . The following military junta , which was supported by the United States , persecuted and murdered thousands of political critics, activists, and leftists in the Dirty War , a period of state terrorism and civil unrest that lasted until the election of Raúl Alfonsín as president in 1983 . Argentina is a regional power , and retains its historic status as

9570-499: The problem of reversion that plagues sequence data. They are also generally assumed to have a low incidence of homoplasies because it was once thought that their integration into the genome was entirely random; this seems at least sometimes not to be the case, however. Researchers must decide which character states are "ancestral" ( plesiomorphies ) and which are derived ( synapomorphies ), because only synapomorphic character states provide evidence of grouping. This determination

9680-436: The program settles on a local minimum rather than the desired global minimum. To help solve this problem, many cladogram algorithms use a simulated annealing approach to increase the likelihood that the selected cladogram is the optimal one. The basal position is the direction of the base (or root) of a rooted phylogenetic tree or cladogram. A basal clade is the earliest clade (of a given taxonomic rank[a]) to branch within

9790-604: The prosecution of those responsible for human rights violations during the Proceso : the Trial of the Juntas and other martial courts sentenced all the coup's leaders but, under military pressure, he also enacted the Full Stop and Due Obedience laws, which halted prosecutions further down the chain of command . The worsening economic crisis and hyperinflation reduced his popular support and

9900-551: The region with the 1502 voyage of Amerigo Vespucci . The Spanish navigators Juan Díaz de Solís and Sebastian Cabot visited the territory that is now Argentina in 1516 and 1526, respectively. In 1536 Pedro de Mendoza founded the small settlement of Buenos Aires , which was abandoned in 1541. Further colonization efforts came from Paraguay —establishing the Governorate of the Río de la Plata — Peru and Chile. Francisco de Aguirre founded Santiago del Estero in 1553. Londres

10010-405: The results of model-based methods (Maximum Likelihood or Bayesian approaches) that take into account both branching order and "branch length," count both synapomorphies and autapomorphies as evidence for or against grouping, The diagrams resulting from those sorts of analysis are not cladograms, either. There are several algorithms available to identify the "best" cladogram. Most algorithms use

10120-606: The same time relations with the United States and the United Kingdom became increasingly strained. By 2015, the Argentine GDP grew by 2.7% and real incomes had risen over 50% since the post-Menem era. Despite these economic gains and increased renewable energy production and subsidies, the overall economy had been sluggish since 2011. On 22 November 2015, after a tie in the first round of presidential elections on 25 October , center-right coalition candidate Mauricio Macri won

10230-512: The self-proclaimed Argentine Revolution , creating a new military government that sought to rule indefinitely. Following several years of military rule, Alejandro Agustín Lanusse was appointed president by the military junta in 1971. Under increasing political pressure for the return of democracy, Lanusse called for elections in 1973. Perón was banned from running but the Peronist party was allowed to participate. The presidential elections were won by Perón's surrogate candidate, Hector Cámpora ,

10340-496: The silver and gold mines in Bolivia and Peru, and as such it became part of the Viceroyalty of Peru until the creation of the Viceroyalty of the Río de la Plata in 1776 with Buenos Aires as its capital. Buenos Aires repelled two ill-fated British invasions in 1806 and 1807. The ideas of the Age of Enlightenment and the example of the first Atlantic Revolutions generated criticism of

10450-508: The source of the name. The last and largest of the group and only one found in North America, Alamosaurus , was thirty-four metres (112 feet) in length and one of the last sauropods to go extinct. Most of the saltasaurids were smaller, around fifteen metres (49 feet) in length, and one, Rocasaurus , was only eight metres (26 feet) long. Like all sauropods, the saltasaurids were quadrupeds, their necks and tails were held almost parallel to

10560-434: The start of the steady economic and social decline that pushed the country back into underdevelopment. Uriburu ruled for two years; then Agustín Pedro Justo was elected in a fraudulent election , and signed a controversial treaty with the United Kingdom . Argentina stayed neutral during World War II , a decision that had full British support but was rejected by the United States after the attack on Pearl Harbor . In 1943

10670-460: The term parsimony for a specific kind of cladogram generation algorithm and sometimes as an umbrella term for all phylogenetic algorithms. Algorithms that perform optimization tasks (such as building cladograms) can be sensitive to the order in which the input data (the list of species and their characteristics) is presented. Inputting the data in various orders can cause the same algorithm to produce different "best" cladograms. In these situations,

10780-406: The tree. It is calculated by counting the minimum number of changes in a dataset and dividing it by the actual number of changes needed for the cladogram. A consistency index can also be calculated for an individual character i , denoted c i . Besides reflecting the amount of homoplasy, the metric also reflects the number of taxa in the dataset, (to a lesser extent) the number of characters in

10890-423: The user should input the data in various orders and compare the results. Using different algorithms on a single data set can sometimes yield different "best" cladograms, because each algorithm may have a unique definition of what is "best". Because of the astronomical number of possible cladograms, algorithms cannot guarantee that the solution is the overall best solution. A nonoptimal cladogram will be selected if

11000-450: The violence in Argentina alone included an estimated 15,000 to 30,000 left-wing activists and militants, including trade unionists, students, journalists, Marxists , Peronist guerrillas , and alleged sympathizers. Most of the victims were casualties of state terrorism . The opposing guerrillas' victims numbered nearly 500–540 military and police officials and up to 230 civilians. Argentina received technical support and military aid from

11110-510: The world's top five exporters. Its railway mileage rose from 503 to 31,104 km (313 to 19,327 mi). Fostered by a new public, compulsory, free and secular education system, literacy quickly increased from 22% to 65%, a level higher than most Latin American nations would reach even fifty years later. Furthermore, real GDP grew so fast that despite the huge immigration influx, per capita income between 1862 and 1920 went from 67% of developed country levels to 100%: In 1865, Argentina

11220-572: Was adopted as a symbol by the Filipinos in the Philippine Revolution against Spain. He also secured the diplomatic recognition of Argentina from King Kamehameha I of the Kingdom of Hawaii . Historian Pacho O'Donnell affirms that Hawaii was the first state that recognized Argentina's independence. He was finally arrested in 1819 by Chilean patriots. Revolutionaries split into two antagonist groups:

11330-467: Was already one of the top 25 nations by per capita income. By 1908, it had surpassed Denmark, Canada and the Netherlands to reach 7th place—behind Switzerland, New Zealand, Australia, the United States, the United Kingdom and Belgium. Argentina's per capita income was 70% higher than Italy's, 90% higher than Spain's, 180% higher than Japan's and 400% higher than Brazil 's. Despite these unique achievements,

11440-404: Was elected as the first president of the reunified country. He was followed by Domingo Faustino Sarmiento and Nicolás Avellaneda ; these three presidencies set up the basis of the modern Argentine State. Starting with Julio Argentino Roca in 1880, ten consecutive federal governments emphasized liberal economic policies . The massive wave of European immigration they promoted—second only to

11550-478: Was first associated with the silver mountains legend , widespread among the first European explorers of the La Plata Basin . The first written use of the name in Spanish can be traced to La Argentina , a 1602 poem by Martín del Barco Centenera describing the region. Although "Argentina" was already in common usage by the 18th century, the country was formally named " Viceroyalty of the Río de la Plata " by

11660-431: Was followed by an extended civil war that lasted until 1861, culminating in the country's reorganization as a federation . The country thereafter enjoyed relative peace and stability, with several waves of European immigration , mainly Italians and Spaniards , influencing its culture and demography . Following the death of President Juan Perón in 1974, his widow and vice president, Isabel Perón , ascended to

11770-413: Was founded in 1558; Mendoza , in 1561; San Juan , in 1562; San Miguel de Tucumán , in 1565. Juan de Garay founded Santa Fe in 1573 and the same year Jerónimo Luis de Cabrera set up Córdoba . Garay went further south to re-found Buenos Aires in 1580. San Luis was established in 1596. The Spanish Empire subordinated the economic potential of the Argentine territory to the immediate wealth of

11880-579: Was ousted one year later by a junta of the combined armed forces, led by army general Jorge Rafael Videla . They initiated the National Reorganization Process , often shortened to Proceso . The Proceso shut down Congress, removed the judges on the Supreme Court, banned political parties and unions, and resorted to employing the forced disappearance of suspected guerrilla members including individuals suspected of being associated with

11990-444: Was proposed as an improvement of the CI "for certain applications" This metric also purports to measure of the amount of homoplasy, but also measures how well synapomorphies explain the tree. It is calculated taking the (maximum number of changes on a tree minus the number of changes on the tree), and dividing by the (maximum number of changes on the tree minus the minimum number of changes in

12100-508: Was the first sauropod to be discovered with armor and proved that sauropods had thrived in Cretaceous South America. Paul Sereno eventually recognized a cladistic relationship between Opisthocoelicauda and Saltasaurus to create the family Saltasauridae. The group is defined by the characteristics shared by all with the two best-known members, Saltasaurus and Opisthocoelicaudia . Paleontologists J Wilson and P Upchurch defined

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