BAT10’18-C6-40 is identified as an adult D. This new specimen accounts for the third morphotype found in D. Posterior ossicone variability has already been described in several sivatherine taxa as Sivatherium maurusium (Harris, 1974) but anterior ossicone variability has never been discussed for four-ossicone taxa. The special features of the anterior ossicones of BAT10’18-C6-40, each formed by two bosses and separated by a septum increase the range of morphological variability found in the anterior ossicones of giraffids. 2017 bearing two anterior and two posterior ossicones from the Late Miocene deposits of the site Batallones-10 (MN-10, Cerro de los Batallones, Madrid Basin) sheds light on the complex variability of the cranial appendages of these extinct giraffids. The enigmatic Scleromochlus and the origin of pterosaurs.The recovery of a new partial cranium of Decennatherium rex Ríos et al.Halloween Special X: The legend of a Patagonian Monster.Giant Beasts of Pleistocene South America. (2009), ‘The Fossil Mammals collected by Charles Darwin in South America during his travels on board the HMS Beagle’, Revista de la Asociatión Geológica Argentina. Los hallazgos de mamíferos fósiles durante el período colonial en el actual territorio de la Argentina. Cuvier (1823) later formally named them Mastodon angustidens, Mastodon andium and Mastodon humboldti, respectively (Fernicola et al, 2009). Cuvier also studied fossils from Bolivia, Chile, Colombia, and Ecuador, among which he recognized three morphotypes, designated informally as “mastodonte a dents étroites”, “ mastodonte Cordillierès” and “ mastodonte humboldien”. He assigned the fossil the scientific name Megatherium americanum. A year later, George Cuvier (1769-1832) published the first scientific work on a South American fossil. In 1795, Philippe-Rose Roume (1724-1804), a French officer, sent Bru’s illustrations to the Institut de France, with a little description of the skeleton. This is the real starting point of paleontological studies in the Rio de la Plata. In 1789, the specimen was sent to the Cabinet of Natural History in Madrid where was illustrated by Juan Bautista Brú de Ramón (1740-1799). On April 29, 1787, he sent a letter to the Viceroy Francisco Nicolás Cristóbal del Campo, Marqués de Loreto, with details of his work. In 1787, Fray Manuel de Torres found near the banks of the Lujan River, the skeletal remains of a gigantic mammal. He carefully documented this extraordinary finding. Portrait of Manuel Torres by Francisco Fortuny. In Spain, scholars of the Real Academia de la Historia, stated that the remains were not human, conjecturing that those bones resembled those of a quadruped, and perhaps an Elephant. The scholars were right, the remains in question belonged to mastodons, extinct relatives of elephants. Previously to the trip, three surgeons, Matías Grimau, Juan Parán and Ángel Casteli, analyzed the bones to determine if these were humans. In 1766, by order of Juan de Lezica y Torrezuri (1709-1783), Mayor of Buenos Aires, fossil remains recovered in Arrecifes, were sent to Spain. However, the first formal description of a gliptodonte was performed in 1838, by English naturalist Sir Richard Owen. It seemed in all respects, except it’s size, to be the upper part of the shell of the armadillo which, in these times, is not above a span in breadth.” (1774, p. He wrote: “I myself found the shell of an animal, composed of little hexagonal bones, each bone an inch in diameter at least and the shell was near three yards over. In 1760, the English Jesuit Thomas Falkner, discovered the first remains of a glyptodon. In the second half of the sixteenth century, Fray Reginaldo de Lizarraga (1540-1609), referred in his writings to those “ graves of giants” found in Córdoba, Argentina. These fossils were interpreted as the remains of an ancestral race of giant humans erased from the face of the Earth by a divine intervention. The first notices of South American fossils were reported by early Spanish explorers. Megatherium americanum on display at the MACN.
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