Actual knowledge of Oligocene origin of sloths

Autores
Pujos, Francisco; De Iuliis, Gerardo
Año de publicación
2010
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Tardigrades constitute one of three clades of Xenarthra. Whereas modern tree sloths are common in the Amazonian Basin, their giant ground sloth "kin" were abundant throughout the Americas. During the Miocene, sloths were conspicuous faunal elements in Patagonia, generally considered as the cradle of most endemic South American mammalian clades. Although middle Miocene sloths are abundant, pre-Miocene forms are rare and recorded from isolated localities, like Salla (Bolivian Altiplano) and La Flecha (Patagonia). Recent discoveries in Tinguirirican SALMA levels of Chile and Deseadan SALMA of Quebrada Fiera (Mendoza, Argentina) and Lacayani (Bolivia) provide information on the early diversification of sloths. Pseudoglyptodon is the first Tardigrada from the early and late Miocene of Chile and Bolivia, but more material is necessary to clarify its phylogenetic affinities. This genus exhibits the common sloth dental formula (1/1C-4/3M) but lower trilobed molariform teeth and dentine structure seem to be more closely related to glyptodontoids. Sloths are recorded from the Late Oligocene of Patagonia, with the Mylodontoidea Octodontotherium and Orophodon and the Megalonychidae Deseadognathus. New remains from Quebrada Fiera also confirm the presence of these two clades, and the genera clearly exhibit a Patagonian influence. Tardigrada from the classic Salla locality (Bolivian Deseadan) are small, presenting a distinct evolutionary pattern with a peculiar organization of lophs and lophids. The actual knowledge of sloths suggests the broad generalizations that: 1) more abundant early Oligocene remains are required to comprehend phylogenetic relationships between Tardigrada and armored Xenarthra (i.e., Cingulata), 2) Oligocene megalonychid and mylodontoid sloths are relatively abundant in southern and central South America (Chile, Bolivia, and Argentina), 3) the sloth assemblage from Salla is distinct from the common mylodontoid pattern present in Chile and Argentina. Clearly, our understanding of sloth origins is severely limited, and new discoveries in tropical areas of the continent are crucial.
Simposio V: Los mamíferos oligocenos de América del Sur: explosión evolutiva de los mamíferos nativos y llegada de los emigrantes africanos
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Paleontología
Sloths
Origin
Oligocene
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/16677

id SEDICI_1ba6421c041fbad1089242e53b904e2e
oai_identifier_str oai:sedici.unlp.edu.ar:10915/16677
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Actual knowledge of Oligocene origin of slothsPujos, FranciscoDe Iuliis, GerardoCiencias NaturalesPaleontologíaSlothsOriginOligoceneTardigrades constitute one of three clades of Xenarthra. Whereas modern tree sloths are common in the Amazonian Basin, their giant ground sloth "kin" were abundant throughout the Americas. During the Miocene, sloths were conspicuous faunal elements in Patagonia, generally considered as the cradle of most endemic South American mammalian clades. Although middle Miocene sloths are abundant, pre-Miocene forms are rare and recorded from isolated localities, like Salla (Bolivian Altiplano) and La Flecha (Patagonia). Recent discoveries in Tinguirirican SALMA levels of Chile and Deseadan SALMA of Quebrada Fiera (Mendoza, Argentina) and Lacayani (Bolivia) provide information on the early diversification of sloths. Pseudoglyptodon is the first Tardigrada from the early and late Miocene of Chile and Bolivia, but more material is necessary to clarify its phylogenetic affinities. This genus exhibits the common sloth dental formula (1/1C-4/3M) but lower trilobed molariform teeth and dentine structure seem to be more closely related to glyptodontoids. Sloths are recorded from the Late Oligocene of Patagonia, with the Mylodontoidea Octodontotherium and Orophodon and the Megalonychidae Deseadognathus. New remains from Quebrada Fiera also confirm the presence of these two clades, and the genera clearly exhibit a Patagonian influence. Tardigrada from the classic Salla locality (Bolivian Deseadan) are small, presenting a distinct evolutionary pattern with a peculiar organization of lophs and lophids. The actual knowledge of sloths suggests the broad generalizations that: 1) more abundant early Oligocene remains are required to comprehend phylogenetic relationships between Tardigrada and armored Xenarthra (i.e., Cingulata), 2) Oligocene megalonychid and mylodontoid sloths are relatively abundant in southern and central South America (Chile, Bolivia, and Argentina), 3) the sloth assemblage from Salla is distinct from the common mylodontoid pattern present in Chile and Argentina. Clearly, our understanding of sloth origins is severely limited, and new discoveries in tropical areas of the continent are crucial.Simposio V: Los mamíferos oligocenos de América del Sur: explosión evolutiva de los mamíferos nativos y llegada de los emigrantes africanosFacultad de Ciencias Naturales y Museo2010info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/16677enginfo:eu-repo/semantics/altIdentifier/isbn/978-987-95849-7-2info:eu-repo/semantics/reference/hdl/10915/25738info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T10:52:58Zoai:sedici.unlp.edu.ar:10915/16677Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 10:52:59.074SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Actual knowledge of Oligocene origin of sloths
title Actual knowledge of Oligocene origin of sloths
spellingShingle Actual knowledge of Oligocene origin of sloths
Pujos, Francisco
Ciencias Naturales
Paleontología
Sloths
Origin
Oligocene
title_short Actual knowledge of Oligocene origin of sloths
title_full Actual knowledge of Oligocene origin of sloths
title_fullStr Actual knowledge of Oligocene origin of sloths
title_full_unstemmed Actual knowledge of Oligocene origin of sloths
title_sort Actual knowledge of Oligocene origin of sloths
dc.creator.none.fl_str_mv Pujos, Francisco
De Iuliis, Gerardo
author Pujos, Francisco
author_facet Pujos, Francisco
De Iuliis, Gerardo
author_role author
author2 De Iuliis, Gerardo
author2_role author
dc.subject.none.fl_str_mv Ciencias Naturales
Paleontología
Sloths
Origin
Oligocene
topic Ciencias Naturales
Paleontología
Sloths
Origin
Oligocene
dc.description.none.fl_txt_mv Tardigrades constitute one of three clades of Xenarthra. Whereas modern tree sloths are common in the Amazonian Basin, their giant ground sloth "kin" were abundant throughout the Americas. During the Miocene, sloths were conspicuous faunal elements in Patagonia, generally considered as the cradle of most endemic South American mammalian clades. Although middle Miocene sloths are abundant, pre-Miocene forms are rare and recorded from isolated localities, like Salla (Bolivian Altiplano) and La Flecha (Patagonia). Recent discoveries in Tinguirirican SALMA levels of Chile and Deseadan SALMA of Quebrada Fiera (Mendoza, Argentina) and Lacayani (Bolivia) provide information on the early diversification of sloths. Pseudoglyptodon is the first Tardigrada from the early and late Miocene of Chile and Bolivia, but more material is necessary to clarify its phylogenetic affinities. This genus exhibits the common sloth dental formula (1/1C-4/3M) but lower trilobed molariform teeth and dentine structure seem to be more closely related to glyptodontoids. Sloths are recorded from the Late Oligocene of Patagonia, with the Mylodontoidea Octodontotherium and Orophodon and the Megalonychidae Deseadognathus. New remains from Quebrada Fiera also confirm the presence of these two clades, and the genera clearly exhibit a Patagonian influence. Tardigrada from the classic Salla locality (Bolivian Deseadan) are small, presenting a distinct evolutionary pattern with a peculiar organization of lophs and lophids. The actual knowledge of sloths suggests the broad generalizations that: 1) more abundant early Oligocene remains are required to comprehend phylogenetic relationships between Tardigrada and armored Xenarthra (i.e., Cingulata), 2) Oligocene megalonychid and mylodontoid sloths are relatively abundant in southern and central South America (Chile, Bolivia, and Argentina), 3) the sloth assemblage from Salla is distinct from the common mylodontoid pattern present in Chile and Argentina. Clearly, our understanding of sloth origins is severely limited, and new discoveries in tropical areas of the continent are crucial.
Simposio V: Los mamíferos oligocenos de América del Sur: explosión evolutiva de los mamíferos nativos y llegada de los emigrantes africanos
Facultad de Ciencias Naturales y Museo
description Tardigrades constitute one of three clades of Xenarthra. Whereas modern tree sloths are common in the Amazonian Basin, their giant ground sloth "kin" were abundant throughout the Americas. During the Miocene, sloths were conspicuous faunal elements in Patagonia, generally considered as the cradle of most endemic South American mammalian clades. Although middle Miocene sloths are abundant, pre-Miocene forms are rare and recorded from isolated localities, like Salla (Bolivian Altiplano) and La Flecha (Patagonia). Recent discoveries in Tinguirirican SALMA levels of Chile and Deseadan SALMA of Quebrada Fiera (Mendoza, Argentina) and Lacayani (Bolivia) provide information on the early diversification of sloths. Pseudoglyptodon is the first Tardigrada from the early and late Miocene of Chile and Bolivia, but more material is necessary to clarify its phylogenetic affinities. This genus exhibits the common sloth dental formula (1/1C-4/3M) but lower trilobed molariform teeth and dentine structure seem to be more closely related to glyptodontoids. Sloths are recorded from the Late Oligocene of Patagonia, with the Mylodontoidea Octodontotherium and Orophodon and the Megalonychidae Deseadognathus. New remains from Quebrada Fiera also confirm the presence of these two clades, and the genera clearly exhibit a Patagonian influence. Tardigrada from the classic Salla locality (Bolivian Deseadan) are small, presenting a distinct evolutionary pattern with a peculiar organization of lophs and lophids. The actual knowledge of sloths suggests the broad generalizations that: 1) more abundant early Oligocene remains are required to comprehend phylogenetic relationships between Tardigrada and armored Xenarthra (i.e., Cingulata), 2) Oligocene megalonychid and mylodontoid sloths are relatively abundant in southern and central South America (Chile, Bolivia, and Argentina), 3) the sloth assemblage from Salla is distinct from the common mylodontoid pattern present in Chile and Argentina. Clearly, our understanding of sloth origins is severely limited, and new discoveries in tropical areas of the continent are crucial.
publishDate 2010
dc.date.none.fl_str_mv 2010
dc.type.none.fl_str_mv info:eu-repo/semantics/conferenceObject
info:eu-repo/semantics/publishedVersion
Resumen
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
format conferenceObject
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/16677
url http://sedici.unlp.edu.ar/handle/10915/16677
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/isbn/978-987-95849-7-2
info:eu-repo/semantics/reference/hdl/10915/25738
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
_version_ 1844615784520744960
score 13.070432