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''Xenastrapotherium'' is an extinct genus of astrapothere, a type of hoofed herbivorous mammal, native to South America, which lived in the mid-Miocene period, during the Laventan stage. It is a member of the family Astrapotheriidae in the subfamily Uruguaytheriinae, large astrapotheres, equipped with a trunk-like nose and protruding teeth, similar to the elephants, but their tusks were the canine teeth, not the incisors. ''Xenastrapotherium'' (named after the Greek word ''xenos'' "strange" add to the genus ''Astrapotherium'', "lightning beast") was a genus widely distributed in northern South America, in contrast to other species of astrapotheres which lived in the area of the Southern Cone of the continent. It differed from other astrapotheres by having two lower incisors on each side of the jaw and the tusks have a pronounced longitudinal curvature, although their general shape and size are probably very similar to ''Astrapotherium'', whose weight would be 900 to 1,500 kilograms, comparable to the current black rhino.〔Johnson, S. C. & Madden, R. H. 1997. Uruguaytheriine astrapotheres of tropical South America. In Kay, R. F., Madden, R. H., Cifelli, R. L. & Flynn, J. J. (eds) ''Vertebrate Paleontology in the Neotropics: The Miocene fauna of La Venta, Colombia''. Smithsonian Institution Press (Washington, D.C.), pp. 355-381.〕 == Species == Several species of ''Xenastrapotherium'' have been described, although none is known from complete remains; they are distinguished by features of their teeth and jaws, and their geographical and temporal distribution. The species currently recognized are: * ''X. christi'' (Stehlin, 1929): the first known species, originally classified by Stehlin (1929) as ''Astrapotherium christi'', and later reclassified to the current genus.〔Kraglievich, L. 1928. Sobre el supuesto ''Astrapotherium christi'' Stehlin descubierto en Venezuela (''Xenastrapotherium'' n. gen.) y sus relaciones con ''Astrapotherium magnum'' y ''Uruguaytherium beaulieui''. Buenos Aires, Franco.〕 It was found in Venezuela near Zaraza in the state of Guarico, based on a full lower jaw.〔Stehlin, H. 1928. Ein ''Astrapotherium'' fund aus Venezuela. ''Eclogae Geol. Helvetiae'', vol. 21, pp. 227-232.〕 * ''X. kraglievichi'' (Cabrera, 1929): based on several teeth and some jaws, discovered in the area of La Venta (Group Honda, Villavieja Formation) in the department of Huila, Colombia, dating from the middle Miocene, about 13 to 11 million years. Distinguished by their lower tusks, which were more horizontal and rounded in cross-section.〔Cabrera, A, 1929. Un Astrapotherido de Colombia, ''Rev. Soc. Argentina Cienc. Nat''., t. 9, pp. 436-439, 3 fig., Buenos Aires.〕 This species was contemporary with its great relative, ''Granastrapotherium''. * ''X. aequatorialis'' (Johnson & Madden, 1997): Based on a piece of right lower jaw, found in the river Burgaya in the province of Cañar, Ecuador, in the Biblián Formation (Middle Miocene, 19 million years ago). Is distinguished by its molar with buccal and labial cingulum, and the first molar was lophodont and had roots. This species is older than the fossils of La Venta, contemporary with Astrapotheriinae like ''Astrapotherium'', ''Astrapothericulus'' and ''Parastrapotherium''.〔 * ''X. chaparralensis'' (Johnson & Madden, 1997): Another species known from Colombia, was found near to Chaparral in department of Tolima, in the Tuné Formation (early Miocene). It is distinguished by its greater molar area, a high molar buccal cingulum, with canines very similar to those of ''X. kraglievichi''.〔 * ''X. amazonense'' (Paula Couto, 1976): Based on a jaw fragments found in the vicinity of the river Breu, Pedra Pintada, Brazil, also found it in the Fitzcarrald Arch in Peru. It is distinguished by the large size of the third molar, compared to other species of ''Xenastrapotherium''. It was classified originally in its own genus, ''Synastrapotherium''.〔Paula Couto, C. Fossil mammals from the Cenozoic of Acre, Brazil. 1 - Astrapotheria. In: ''Congresso Brasileiro de Geologia'', 28. Porto Alegre, 1974, ''Anais'', 2:237-249.〕 A tusk assigned to this species was found in the zone of Acre in Brazil, in deposits from the late Miocene, which make it the most recent record for the astrapotheres;〔Frailey C. D. 1986. — Late Miocene and Holocene mammals, exclusive of the Notoungulata, of the Rio Acre region, western Amazonia. ''Contributions in Science'', Natural History Museum of Los Angeles County 374: 1–46.〕 but this idea has been challenged, since that it fossil could be not coming from an astrapothere.〔Cyrielle Goillot, Pierre-Olivier Antoine, Julia Tejada, François Pujos. 2011. Middle Miocene Uruguaytheriinae (Mammalia, Astrapotheria) from Peruvian Amazonia and a review of the astrapotheriid fossil record in northern South America. ''Geodiversitas'' 33(2):331-345, http://dx.doi.org/10.5252/g2011n2a8〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Xenastrapotherium」の詳細全文を読む スポンサード リンク
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