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The Xenarthrans: Armadillos, Glyptodonts, Anteaters, and Sloths

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Book cover History of Terrestrial Mammals in South America

Part of the book series: Topics in Geobiology ((TGBI,volume 42))

Abstract

From the time that the first xenarthrans appeared as early armadillos in the Early Paleocene Itaborai, the group diversified into strange and wonderful forms. Besides the Dasypodidae, a group called the Glyptodontidae arose and diversified; some were the size (and shape) of a Volkswagen bug and were harmless grazers. They were very common on the grassy savannas of South America. Also, the sloth lineage appeared with the last species reaching the greatest size of any southern mammal. Megatherium americanum became one of the largest mammals known in South America, equivalent in size to an elephant. Finally a short history of the little-known anteaters is presented. A discussion of the possible but unconfirmed origins of the xenarthra is suggested, and the group is presented as one of the most ancient lineages of modern mammals and native South Americans.

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References

  • Aguilar DH, Laurito CA (2009) El armadillo gigante (Mammalia, Xenarthra, Pampatheriidae) del Río Tomayate, Blancano Tardío-Irvingtoniano temprano, El Salvador,América Central. Revista Geológico de América Central 41:25–36

    Google Scholar 

  • Amson E, de Muizon C, Laurin M, Argot C, de Burfénil V (2014) Gradual adaptation of bone structure to aquatic lifestyle in extinct sloths from Peru. Proc R Soc B 281. https://doi.org/10.1098/fxp.2014.0192

  • Antoine PO, Marivaux L, Croft DA, Billet G et al (2011) Middle Eocene rodents from Peruvian Amazonia reveal the pattern and timing of caviomorph origins and biogeography. Proc R Soc B 279:1319–1326

    Article  Google Scholar 

  • Bargo MS (2001) The ground sloth Megatherium americanum: skull shape, bite forces, and diet. Acta Palaeontol Pol 46(2):173–192

    Google Scholar 

  • Bargo MS, Vizcaíno SF (2008) Paleobiology of Pleistocene ground sloths (Xenarthra, Tardigrada): biomechanics, morphogeometry and ecomorphology applied to the masticatory apparatus. Ameghiniana (Rev Asoc Paleontol Argent) 45(1):175–196

    Google Scholar 

  • Bargo MS, Toledo N, Vizcaíno SF (2012) Paleobiology of the Santa Crucian sloths and anteaters (Xenarthra, Pilosa). In: Vizcaino SF, Kay M, Bargo MS (eds) Early Miocene paleobiology in Patagonia: high-latitude paleocommunities of the Santa Cruz Formation. Cambridge University Press, Cambridge, pp 216–242

    Chapter  Google Scholar 

  • Bergqvist LP, Abrantes EAL, Avilla LS (2004) The Xenarthra (Mammalia) of Sao José de Itaboraí Basin (upper Palaeocene, Itaboraian) Rio de Janeiro, Brazil. Geodiversitas 26(2):323–337

    Google Scholar 

  • Campbell KE Jr, Frailey DC, Romero-Pittman L (2000) The late Miocene gomphothere Amahuacatherium peruvium (Proboscidea: Gomphotheriidae) from Amazonian Peru: implications for the great American faunal interchange. Boletin-Instituto Beologico Minero y Metalúrgico. Serie D: Estudios Regionales 23:1–152

    Google Scholar 

  • Campbell KE Jr, Frailey DC, Romero-Pittman L (2009) In defense of Amahuacatherium (Proboscidea: Gomphotheriidae). Neues Jahrb Geol P-A 252:113–128

    Google Scholar 

  • Campbell KE Jr, Prothero DR, Romero-Pittman L, Hertel F, Rivera N (2010) Amazonian magnetostratigraphy: dating the first pulse of the great American faunal interchange. J S Am Earth Sci 26:619–626

    Article  Google Scholar 

  • Campbell KE Jr, Heizler M, Frailey CD, Romero-Pittman L, Prothero DR (2001) Upper Cenozoic chronostratigraphy of the southwestern Amazon basin. Geology 29(7):595–598

    Article  Google Scholar 

  • Canto J, Salas-Gismondi R, Cozzuol M, Yáñez J (2008) The aquatic sloth Thalassocnus (Mammalia, Xenarthra) from the late Miocene of North-Central Chile: biogeographic and ecological implications. J Vertebr Paleontol 28(3):918–922. https://doi.org/10.1671/0272-4634(2008)28[918:TASTMX]2.0.CO;2

    Article  Google Scholar 

  • Carlini AA, Scillato-Yané GJ, Vizcaíno SF, Dozo MT (1992) Un singular Myrmecophagidae (Xenarthra, Vermilingua) de Edad Colhuehuapense (Oligoceno Tardio-Miocene Temprano) de Patagonia, Argentina. Ameghiniana 29:176

    Google Scholar 

  • Cartelle C, De Luliis G (1995) Eremotherium laurillardi: the Panamerican late Pleistocene megatheriid sloth. J Vertebr Paleontol 15(4):830–841

    Article  Google Scholar 

  • Cartelle C, De Luliis G (2006) Eremotherium laurillardi (Lund) (Xenarthra, Megatheriidae), the Panamerican giant ground sloth: taxonomic aspects of the ontogeny of skull and dentition. J Syst Palaeontol 4(2):199–209

    Article  Google Scholar 

  • Ciancio MR, Carlini AA, Campbell KE, Scillato-Yané GJ (2013) New Paleogene cingulates (Mammalia, Xenarthra) from Santa Rosa, Perú and their importance in the context of South American faunas. J Syst Palaeontol 11(6):727–741

    Article  Google Scholar 

  • Cope ED (1889) The Edentata of North America. Am Nat 23(272):657–664

    Article  Google Scholar 

  • Croft DA (2016) Horned armadillos and rafting monkeys. Indiana University Press, Bloomington

    Google Scholar 

  • Croft DA, Flynn JJ, Wyss AR (2007) A new basal glyptodontid and other Xenarthra of the early Miocene Chucal Fauna, Northern Chile. J Vertebr Paleontol 27(4):781–797

    Article  Google Scholar 

  • Cuvier G (1796) Notice sur le squelette d’une très grande espèce de quadrupede inconnue jusqu’à présent, trouvé au Paraguay, et déposé au cabinet d’histoire naturelle de Madrid. Mag encyclop, ou J des Sci, de Lettres et del Art 1:303–310; 2:227–228

    Google Scholar 

  • Dantas MAT, Dutra RP, Cherkinsky A, Costa Fortier D, Yoshino Kamino LH, Cozzuol MA, Ribeiro S, Silva Vieira FS (2012) Paleoecology and radiocarbon dating of the Pleistocene megafauna of the Brazilian intertropical region. Quat Res 79:61. https://doi.org/10.1016/j.yqres.2012.09.006

    Article  Google Scholar 

  • De Muizon C, McDonald HG (1995) An aquatic sloth from the Pliocene of Peru. Nature 375:224–227

    Article  Google Scholar 

  • De Muizon C, McDonald HG, Salas R, Urbina M (2003) A new early species of the aquatic sloth Thalassocnus (Mammalia, Xenarthra) from the late Miocene of Peru. J Vertebr Paleontol 23(4):886–894

    Article  Google Scholar 

  • De Muizon C, McDonald HG, Salas R, Urbina M (2004a) The youngest species of the aquatic sloth Thalassocnus and a reassessment of the relationships of the Nothrothere sloths (Mammalia: Xenarthra). J Vertebr Paleontol 24(2):387–397

    Article  Google Scholar 

  • De Muizon C, McDonald HG, Salas R, Urbina M (2004b) The evolution of feeding adaptations of the aquatic sloth Thalassocnus. J Vertebr Paleontol 24(2):398–410

    Article  Google Scholar 

  • Delsuc F, Ctzeflis FM, Stanhope MJ, Douzery EJP (2001) The evolution of armadillos, anteaters and sloths depicted by nuclear and mitochondrial phylogenies: implications for the status of the enigmatic fossil Eurotamandua. Proc R Soc Lond B 268(1476):1605–1615

    Article  Google Scholar 

  • Delsuc F, Scally M, Madsen O, Stanhope MJ, de Jong WW, Catzeflis FM, Springer MS, Douzery EJP (2002) Molecular phylogeny of living xenarthrans and the impact of character and taxon sampling on the placental tree rooting. Mol Biol Evol 19:1656–1671

    Article  Google Scholar 

  • Delsuc F, Stanhope MJ, Douzery EJP (2003) Molecular systematics of armadillos (Xenarthra, Dasypodidae): contribution of maximum likelihood and Bayesian analyses of mitochondrial and nuclear genes. Mol Phylogenet Evol 28(2):261–275

    Article  Google Scholar 

  • Delsuc F, Vizcaíno SF, Souzery EJP (2004) Influence of Tertiary paleoenvironmental changes on the diversification of South American mammals: a relaxed molecular clock study within xenarthrans. BMC Evol Biol 4:1–13

    Article  Google Scholar 

  • Englemann G (1985) The phylogeny of the Xenarthra. In: Montgomery GG (ed) The ecology and evolution of armadillos, sloths, and vermilinguas. Smithsonian Institution Press, Washington, DC, pp 51–64

    Google Scholar 

  • Fariña RA (1996) Trophic relationships among Lujanian mammals. Evol Theory 11:125–134

    Google Scholar 

  • Fariña RA, Blanco RE (1996) Megatherium, the stabber. Proc R Soc Lond 263:1725–1729

    Article  Google Scholar 

  • Fariña RA, Vizcaíno SF (2001) Carved teeth and strange jaws: how glyptodonts masticated. Acta Palaeontol Pol 46(2):219–234

    Google Scholar 

  • Fariña RA, Vizcaíno SF, Bargo MS (1998) Body mass estimations in Lujanian (Late Pleistocene-Early Holocene of South America) mammal megafauna. Mastozool Neotrop 5(2):87–108

    Google Scholar 

  • Fernicola JC (2005) Análisis filogenético de la familia Glyptodontidae Gray 1869. PhD dissertation, Universidad de la República, Montevideo

    Google Scholar 

  • Fernicola JC (2008) Nuevos aportes para la sistemática de los Glyptodontia Ameghino 1889 (Mammalia, Xenarthra, Cingulata): Ameghiniana 45(3):553–574

    Google Scholar 

  • Fernicola JC, Vizcaíno SF, Fariña RA (2008) The evolution of armored xenarthrans and a phylogeny of the glyptodonts. In: Vizcaíno SF, Loughry WJ (eds) The biology of the Xenarthra. University Press of Florida, Gainesville, pp 79–85

    Google Scholar 

  • França LM, Trindade DAntas MA, Bocchiglieri A, Cherckinsky A, Souza Ribeiro A, Bocherens H (2014) Chronology and ancient feeding ecology of two upper Pleistocene megamammals from the Brazilian intertropical region. Quat Sci Rev 99:78–83

    Article  Google Scholar 

  • Gardner AL (2005a) Order Cingulata. In: Wilson DE, Reeder DAM (eds) Mammal species of the world: a taxonomic and geographic reference, vol I. The Johns Hopkins University Press, Baltimore, pp 94–99

    Google Scholar 

  • Gardner AL (2005b) Order Pilosa. In: Wilson DE, Reeder DAM (eds) Mammal species of the world: a taxonomic and geographic reference, vol I. The Johns Hopkins University Press, Baltimore, pp 100–103

    Google Scholar 

  • Gardner AL (2007) Cohort Placentalia Owen, 1837, Magnorder Xenarthra Cope, 1889. In: Gardner AL (ed) Mammals of South America. Vol. 1. marsupials, xenarthrans, shrews, and bats. University of Chicago Press, Chicago

    Google Scholar 

  • Gaudin TJ (2004) Phylogenetic relationships among sloths (Mammalia, Xenarthra, Tardigrada): the creniodental evidence. Zool J Linn Soc Lond 140:255–305

    Article  Google Scholar 

  • Gaudin TJ, Branham DG (1998) The phylogeny of the Myrmecophagidae (Mammalia, Xenarthra, Vermilingua) and the relationship of Eurotamandua to the Vermilingua. J Mamm Evol 5(3):237–265

    Google Scholar 

  • Gaudin TJ, Wible JR (2006) Chapter 6: The phylogeny of living and extinct armadillos (Mammalia, Xenarthra, Cingulata): a craniodental analysis. In: Carrano MT (ed) Amniote paleobiology: perspectives on the evolution of mammals, birds and reptiles. University of Chicago Press, Chicago, pp 153–198

    Google Scholar 

  • Góis F, Scillato-Yané GJ, Carlini AA (2012) Una nueva especie de Holmesina (Xenarthra, Cingulata, Pampatheriidae) del Pleistoceno de Rondộnia, sudoste de la Amazonia, Brasil. Rev Bras Paleontol 15(2):211–227

    Article  Google Scholar 

  • Goís F, Scillato-Yané GJ, Carlini AA, Guilherme E (2013) A new species of Scirrotherium Edmund & Theodor, 1977 (Xenarthra, Cinculata, Pampatheriidae) from the late Miocene of South America. Alcheringa 37:175–186

    Article  Google Scholar 

  • González LR (2010) Los Cingulata (Mammalia, Xenarthra) del Mioceno temprano y medio de Patagonia (Edades Santacrucense y “Friasense”). Revisión sistemática y concentraciones bioestratigráficas. Mastozool Neotrop 17(2):397–398

    Google Scholar 

  • González-Ruiz LR, Góis F, Ciancio MR, Scillato-Yané GJ (2013) Los Peltephilidae (Mammalia, Xenarthra) de la formación Collón Curá (Colloncurense, Miocéno medio), Argentina. Rev Bras Paleontol 16(2):319–330

    Article  Google Scholar 

  • Gutiérrez MA, Martínez G (2008) Trends in the faunal human exploitation during the late Pleistocene and early Holocene in the Pampean region (Argentina). Quat Int 191:53–68

    Article  Google Scholar 

  • Gutiérrez MA, Martínez GA, Bargo MS, Vizcaíno SF (2010) Supervivencia diferencial de mamíferos de gran tamaño en la Región Pampeana en el Holoceno temprano y su relación con aspectos paleobiológicos. In: Gutierrez M, De Nigris M, Fernández P, Giardina M, Gil A, Izeta A, Neme G, Yacobaccio H (eds) Zooarqueología a principios del siglo XXI. Aportes teóricos, metodológicos y casos de estudio. Ediciones El Espinillo, Buenos Aires, pp 231–242

    Google Scholar 

  • Hallström BM, Kullberg M, Nilsson MA, Janke A (2007) Phylogenomic data analyses provide evidence that Xenarthra and Afrotheria are sister groups. Mol Biol Evol 24(9):2059–2068

    Article  Google Scholar 

  • Hirschfeld SE (1976) A new fossil anteater (Edentata, Mammalia) from Colombia, S. A. and evolution of the Vermilingua. J Paleontol 50(3):419–432

    Google Scholar 

  • Iuliis GD, Bargo MS, Vizcaíno SF (2000) Variation in skull morphology and mastication in the fossil giant armadillos Pampatherium spp. and allied genera (Mammalia: Xenarthra: Pampatheriidae), with comments on their systematics and distribution. J Vertebr Paleontol 20(4):743–754

    Article  Google Scholar 

  • Krmpotic CM, Ciancio MR, Barbeito C, Mario RC, Carlini AA (2009) Osteoderm morphology in recent and fossil euphractine xenarthrans. Acta Zool 90:339–351

    Article  Google Scholar 

  • Liu F-GR, Miyamoto MM, Freire NP, Ong PQ, Tennant MR, Young TS, Gugel KF (2001) Molecular and morphological supertrees for eutherian (placental) mammals. Science 291:1786–1789

    Article  Google Scholar 

  • Madsen O, Scally M, Douady CJ, Kao DF, DeBry RW, Adkins R, Amrine HM, Stanhope MJ, de Jong WW, Springer MS (2001) Parallel adaptive radiations in two major clades of placental mammals. Nature 409:610–614

    Article  Google Scholar 

  • McKenna MC, Bell SK (1997) Classification of mammals above the species level. Columbia University Press, New York

    Google Scholar 

  • McKenna MC, Wyss AR, Flynn JJ (2006) Paleogene pseudoglyptodont xenarthran from Central Chile and Argentinean Patagonia. Am Mus Novit 3536:1–18

    Article  Google Scholar 

  • Mead JI, Swift SL, White RS, McDonald HG, Baez A (2007) Late Pleistocene (Rancholabrean) glypotodont and pampathere (Xenarthra, Cingulata) from Sonora, Mexico. Rev Mex Cienc Geol 24(3):439–449

    Google Scholar 

  • Osborn HF (1904) An armadillo from the middle Eocene (Bridger) of North America. Bull Am Mus Nat Hist 20:163–165

    Google Scholar 

  • Patterson B, Pascual R (1972) The fossil mammal fauna of South America. In: Keast A, Erk FC, Glass B (eds) Evolution, mammals and southern continents. State University of New York Press, Albany, pp 247–309

    Google Scholar 

  • Patterson B, Segall W, Turnbull WD (1989) The ear region in Xenarthrans (=Edentata, Mammalia). Part 1. Cingulata. Fieldiana Geol New Ser 18:1–46

    Google Scholar 

  • Piñero JML (1988) Juan Bautista Bru (1740–1799) and the description of the genus Megatherium. J Hist Biol 21(1):147–163. https://doi.org/10.1007/BF0012579

    Article  Google Scholar 

  • Politis GG, Gutiérrez MA (1998) Gliptodontes y cazadores-recolectores de la región pampeana (Argentina). Lat Am Antiq 9(2):111–134

    Article  Google Scholar 

  • Pujos F, de Iuliis G (2007) Late Oligocene Megatheriidae fauna (Mammalia: Xenathra) from Salla-Luribay (Bolivia): New data on basal sloth radiation and cingulata-Tardigrada Split. J Vertebr Paleontol 27(1):132–144

    Article  Google Scholar 

  • Pujos F, Gaudin TJ, De Iuliis G, Cartelle C (2012) Recent advances on variability, morpho-functional adaptations, dental terminology, and evolution of sloths. J Mammal Evol 19:159–169

    Article  Google Scholar 

  • Rose KD (1999) Eurotamandua and Palaeanodonta: convergent or related? Palaeontol Z 73(3–4):395–401

    Article  Google Scholar 

  • Rose KD (2009) The beginning of the age of mammals. The Johns Hopkins University Press, Baltimore

    Google Scholar 

  • Rose KD, Emory RJ (1993) Relationships of Xenarthra, Pholidota, and fossil “edentates”: the morphological evidence. In: Szalay FS, Novacek MJ, McKenna MC (eds) Mammal phylogeny of placentals. Springer, New York, pp 81–102

    Chapter  Google Scholar 

  • Saint-André PA, de Iuliis G (2001) The smallest and most ancient representative of the genus Megatherium Cuvier, 1796 (Xenarthra, Tardigrada, Megatheriidae), from the Pliocene of the Bolivian Altiplano. Geodiversitas 23(4):625–645

    Google Scholar 

  • Scillato-Yane GJ (1975) Presencia de Macroeuphractus retusus (Xenarthra, Dasypodidae) en el Plioceno del área mesopotámia (Argentina): Su importancia bioestratigrafica y paleobiogeografica. Ameghiniana 12(4):322–328

    Google Scholar 

  • Scillato-Yané GJ, Carlini AA, Tonni EP, Noriega JI (2005) Paleobiogeography of the late Pleistocene pampatheres of South America. J S Am Earth Sci 20:131–138

    Article  Google Scholar 

  • Shockey BJ, Anaya F (2010) Grazing in a new late Oligocene mylodontid sloth and a mylodontid radiation as a component of the Eocene-Oligocene faunal turnover and the early spread of grasslands/savannas on South America. J Mammal Evol 18:101. https://doi.org/10.1007/s10914-010-9147-5

    Article  Google Scholar 

  • Simpson GG (1931) Metacheiromys and the Edentata. Bull Am Mus Nat Hist 59:295–381

    Google Scholar 

  • Simpson GG (1980) Splendid isolation: the curious history of south American mammals. Yale University Press, New Haven

    Google Scholar 

  • Soibelzon LH, Aamorano M, Scillato-Yané GJ, Piazza D, Rodríguez S, Soibelzon E, Tonni EP, Cristóbal JS, Beilinson E (2012) Un Glyptodontidae de gran tamaño en el Holoceno temprano de la región pampeana, Argentina. Rev Bras Paleontol 15(1):105–112

    Article  Google Scholar 

  • Tauber AA (1997) Paleoecología de la formación Santa Cruz (Mioceno inferior) en el extremo sudeste de la Patagonia. Ameghiniana 34(4):517–529

    Google Scholar 

  • Tito G (2008) New remains of Eremotherium laurillardi (Lund, 1842) (Megatheriidae, Xenarthra) from the coastal región of Ecuador. J S Am Earth Sci 26:424–434

    Article  Google Scholar 

  • Vizcaíno SF, De Iuliis G (2003) Evidence for advanced carnivory in fossil armadillos (Mammalia: Xenarthra: Dasypodidae). Paleobiology 29(1):123–138

    Article  Google Scholar 

  • Vizcaíno SF, Fariña RA (1997) Diet and locomotion of the armadillo Peltephilus: a new view. Lethaia 30(79–86):79–86

    Google Scholar 

  • Vizcaíno SF, Scillato-Yané GJ (1995) Short note: an Eocene tardigrade (Mammalia, Xenarthra) from Seymour island, West Antarctica. Antarct Sci 7(4):407–408

    Google Scholar 

  • Vizcaíno SF, Bargo MS, Kay RF, Milne N (2006) The armadillos (Mammalia, Xenarthra, Dasypodidae) of the Santa Cruz Formation (early-middle Miocene): an approach to their paleobiology. Palaeogeogr Palaeoclimatol Palaeoecol 237:255–269

    Article  Google Scholar 

  • Vizcaíno SF, Blanco RE, Bender B, Milne N (2011) Proportions and function of the limbs of glyptodonts. Lethaia 44:93–101

    Article  Google Scholar 

  • Vizcaíno SF, Fernicola JC, Bargo MS (2012) Paleoecology of the Santacrucian glypdodonts and armadillos (Xenarthra, Cingulata). In: Vizcaino SF, Kay M, Bargo MS (eds) Early Miocene paleobiology in Patagonia: high-latitude paleocommunities of the Santa Cruz formation. Cambridge University Press, Cambridge, pp 194–215

    Chapter  Google Scholar 

  • Wetzel RM, Gardner AL, Redford KH, Eisenberg JF (2007) Order Cingulata Illiger, 1811. In: Gardner AL (ed) Mammals of South America. Marsupials, xenarthrans, shrews, and bats. University of Chicago Press, Chicago, pp 128–157

    Google Scholar 

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  1. Department of Biology, National University of Colombia, Bogota, Bogota, Colombia

    Thomas Defler

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Defler, T. (2019). The Xenarthrans: Armadillos, Glyptodonts, Anteaters, and Sloths. In: History of Terrestrial Mammals in South America. Topics in Geobiology, vol 42. Springer, Cham. https://doi.org/10.1007/978-3-319-98449-0_6

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