† Megalonychidae


Additional Functions


Belong­ing to

Gaeabionta  ⇒ Domäne: Eukaryota  ⇒ Reich: Animalia  ⇒ Mittelreich: Eumetazoa  ⇒ Klade: Triploblastica  ⇒ Klade: Nephrozoa  ⇒ Abzweig: Deuterostomia  ⇒ Stamm: Chordata  ⇒ Unterstamm: Vertebrata  ⇒ Infrastamm: Gnathostomata  ⇒ Superklasse: Tetrapoda  ⇒ Klasse: Mammalia  ⇒ Unterklasse: Theriiformes  ⇒ Infraklasse: Holotheria  ⇒ Superlegion: Trechnotheria  ⇒ Legion: Cladotheria  ⇒ Sublegion: Zatheria  ⇒ Infralegion: Tribosphenida  ⇒ Superkohorte: Theria  ⇒ Kohorte: Placentalia  ⇒ Ordnung: Xenarthra  ⇒ Infraordnung: Pilosa

Taxo­nomic seg­ment


This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.

Name from

Corre­spond­ing author (Name, Year)

Gervais, 1855

Other languages



Lebenszeitraum in Million Jahren (Ma)

Start age: 38 Ma - End age: 0 Ma
Upper Pleistocene

Additional data by PBDB, License: CC BY

Motility: actively mobile
Habit: ground dwelling
Environment: terrestrial


Compositon of the remains:


Reference- and Source indication, Literature

Next lower taxonomy level

On the same taxonomic level (siblings) (Count: 9)

Taxonomic assignment (189)

References by PBDB, License: CC BY

  • S. R. Stinnesbeck, 2020 - Xibalbaonyx exinferis n. sp. (Megalonychidae), a new Pleistocene ground sloth from the Yucatán Peninsula, Mexico - Historical Biology (), - (journal article, English)
  • M. S. Bargo, 2019 - Early Miocene Sloths (Xenarthra, Folivora) From the Río Santa Cruz Valley (Southern Patagonia, Argentina), Ameghino, 1887 Revisited - Early–Middle Miocene Paleontology in the Río Santa Cruz, Southern Patagonia, Argentina. 130 years since Ameghino, 1887 (19), 102-137 (book chapter, English)
  • L. Varela, 2019 - Phylogeny, Macroevolutionary Trends and Historical Biogeography of Sloths: Insights From a Bayesian Morphological Clock Analysis - Systematic Biology (68), 204-218 (journal article, English)
  • L. B. Albright, 2019 - Cenozoic vertebrate biostratigraphy of South Carolina, U.S.A. and additions to the fauna - Bulletin of the Florida Museum of Natural History (57), 77-236 (journal article, English)
  • A. D. Rincón, 2019 - Two new megalonychid sloths (Mammalia: Xenarthra) from the Urumaco Formation (late Miocene), and their phylogenetic affinities - Journal of Systematic Palaeontology (17), 409-421 (journal article, English)
  • S. R. Stinnesbeck, 2018 - New insights on the paleogeographic distribution of the Late Pleistocene ground sloth genus Xibalbaonyx along the Mesoamerican Corridor - Journal of South American Earth Sciences (85), 108-120 (journal article, English)
  • H. G. McDonald, 2017 - Increased xenarthran diversity of the Great American Biotic Interchange: a new genus and species of ground sloth (Mammalia, Xenarthra, Megalonychidae) from the Hemphillian (late Miocene) of Jalisco, Mexico - Journal of Paleontology (91), 1069-1082 (journal article, English)
  • H. G. McDonald, 2017 - A new genus of megalonychid ground sloth (Mammalia, Xenarthra) from the late Pleistocene of Quintana Roo, Mexico - Journal of Vertebrate Paleontology (37), e1307-14 (journal article, English)
  • S. R. Stinnesbeck, 2017 - Xibalbaonyx oviceps, a new megalonychid ground sloth (Folivora, Xenarthra) from the Late Pleistocene of the Yucatán Peninsula, Mexico, and its paleobiogeographic significance - Paläontologische Zeitschrift (91), 245-271 (journal article, English)
  • D. Brandoni, 2017 - Chronological implications of the nothrotheriid ‘Xyophorus’ (Mammalia, Xenarthra) from the Collón Curá Formation (Miocene of Patagonia, Argentina) - Historical Biology (), - (journal article, English)
  • D. Brandoni, 2016 - Megatherioidea (Mammalia, Xenarthra, Tardigrada) from the Pinturas Formation (Early Miocene), Santa Cruz Province (Argentina) and their chronological implications - Paläontologische Zeitschrift (90), 619-628 (journal article, English)
  • G. De Iuliis, 2014 - Eucholoeops Ameghino, 1887 (Xenarthra, Tardigrada, Megalonychidae) from the Santa Cruz Formation, Argentine Patagonia: implications for the systematics of Santacrucian sloths - Geodiversitas (36), 209-255 (journal article, English)
  • A. L. Valerio, 2014 - Nueva evidencia de un estadio juvenil de Pliometanastes protistus y su relación con ?Pliometanastes galushai Hirschfeld & Webb, 1968 (Xernarthra, Megalonychidae) para el Mioceno Superior de Costa Rica - Revista Geológica de América Central (51), 159-163 (journal article, Spanish)
  • D. Brandoni, 2014 - A new genus of Megalonychidae (Mammalia, Xenarthra) from the late Miocene of Argentina - Revista Brasileira de Paleontologia (17), 33-42 (journal article, English)
  • J. S. Zijlstra, 2014 - New rodents (Cricetidae) from the Neogene of Curaçao and Bonaire, Dutch Antilles - Palaeontology (57), 895-908 (journal article, English)
  • H. G. McDonald, 2013 - A New Genus of Megalonychid Sloth (Mammalia, Xenarthra) from the Late Pleistocene (Lujanian) of Sierra De Perija, Zulia State, Venezuela - Journal of Vertebrate Paleontology (33), 1226-1238 (journal article, English)
  • D. Brandoni, 2013 - Los Tardigrada (Mammalia, Xenarthra) del Mioceno tardío de Entre Ríos Argentina - El Neógeno de la Mesopotamia argentina (14), 135-144 (journal article, Spanish)
  • A. Corona, 2013 - Catonyx cuvieri (Xenarthra, Mylodontidae, Scelidotheriinae) from the late Pleistocene of Uruguay, with comments regarding the systematics of the subfamily - Journal of Vertebrate Paleontology (33), 1214-1225 (journal article, English)
  • D. Brandoni, 2011 - The Megalonychidae (Xenarthra, Tardigrada) from the late Miocene of Entre Ríos Province, Argentina, with remarks on their systematics and biogeography - Geobios (44), 33-44 (journal article, English)
  • D. Brandoni, 2010 - On the systematics of Ortotherium Ameghino (Xenarthra, Tardigrada, Megalonychidae) from the 'Conglomerado osífero' (late Miocene) of Argentina - Journal of Vertebrate Paleontology (30), 975-980 (journal article, English)
  • D. Brandoni, 2009 - Descripción del fémur de Protomegalonyx chasicoensis Scillato-Yané (Mammalia, Xenarthra, Megalonychidae) de la Formación Arroyo Chasicó (Mioceno tardío), provincia de Buenos Aires, Argentina. Consideraciones sistemáticas sobre los perezosos de Edad Chasiq - Ameghiniana (46), 513-521 (journal article, Spanish)
  • C. Cartelle, 2009 - Systematic revision of tropical Brazilian scelidotheriine sloths (Xenarthra, Mylodontoidea) - Journal of Vertebrate Paleontology (29), 555-566 (journal article, English)
  • D. Brandoni, 2009 - On the presence of Pyramiodontherium (Mammalia, Xenarthra, Megatheriidae) in the late Miocene of northeastern Argentina and its biogeographical implications - Rivista Italiana di Paleontologia e Stratigrafia (115), 111-123 (journal article, English)
  • G. De Iuliis, 2009 - A new ground sloth (Mammalia: Xenarthra) from the Quaternary of Brazil - Comptes Rendus Palevol (8), 705-715 (journal article, English)
  • D. Brandoni, 2008 - Nuevos materiales de Ortotheriinae (Xenarthra, Tardigrada, Megalonychidae) procedentes del "Mesopotamiense" (Mioceno tardio) de Entre Rios - Instituto Superior de Correlacion Geologica (INSUGEO) Serie Miscelanea (17), 11-20 (journal article, Spanish)
  • C. Cartelle, 2008 - A new species of Megalonychidae (Mammalia, Xenarthra) from the Quaternary of Poço Azul (Bahia, Brazil) - Comptes Rendus Palevol (7), 335-346 (journal article, English)
  • H. G. McDonald, 2007 - Xenarthra - Evolution of Tertiary Mammals of North America (2), 147-160 (book/book chapter, English)
  • F. Pujos, 2007 - A peculiar climbing Megalonychidae from the Pleistocene of Peru and its implication for sloth history - Zoological Journal of the Linnean Society (149), 179-235 (journal article, English)
  • A. A. Carlini, 2005 - Los Xenarthra de Gran Barranca: Más de 20 Ma de historia - Actas del XVI Congreso Geológico Argentino. La Plata 2005 (), - (journal article, Spanish)
  • A. A. Carlini, 2004 - The oldest Megalonychidae (Xenarthra: Tardigrada); phylogenetic relationships and an emended diagnosis of the family - Neues Jahrbuch für Geologie und Paläontologie Abhandlungen (233), 423-443 (journal article, English)
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  • S. D. Webb, 1985 - New megalonychid sloths from El Salvador - The evolution and ecology of armadillos, sloths, and vermilinguas (), 113-120 (book chapter, English)
  • S. E. Hirschfeld, 1985 - Ground sloths from the Friasian La Venta fauna, with additions to the pre-Frasian Coyaima fauna of Colombia, South America - University of California Publications in Geological Sciences (128), 1-91 (journal article, English)
  • B. Kurten, 1980 - - Pleistocene mammals of North America (), 1-442 (book, English)
  • G. J. Scillato-Yané, 1980 - Nuevo Megalonychidae (Edentata, Tardigrada) del "Mesopotamiense" (Mioceno tardío-Plioceno) de la Provincia de Entre Ríos - Ameghiniana (17), 193-199 (journal article, Spanish)
  • E. P. Gustafson, 1978 - The Vertebrate Faunas of the Pliocene Ringold Formation, South-Central Washington - Bulletin of the Museum of Natural History, University of Oregon (23), 1-62 (journal article, English)
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  • S. E. Hirschfeld, 1968 - Plio-Pleistocene Megalonychid Sloths of North America - Bulletin of the Florida State Museum (12), - (journal article, English)
  • R. Hoffstetter, 1954 - Les gravigrades (Edentes Xenarthres) des cavernes de Lagoa Santa (Minas Gerais, Bresil) - Annalles des Sciences Naturelles, Zoologie (11), 741-764 (journal article, French)
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