The Toro Negro megatheriine (Mammalia, Xenarthra): A new species of Pyramiodontherium and a review of Plesiomegatherium

The fossil record of megatheriine ground sloths extends back to the middle Miocene, but only Pleistocene megatheriines are reasonably well understood. The taxonomy of pre-Pleistocene genera and species is not well-established. A partial megatheriine skeleton lacking the skull from the Pliocene Toro...

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Detalles Bibliográficos
Autor principal: Ré, Guillermo Héctor
Publicado: 2004
Materias:
fossil
new species
Pliocene
Edentata
Mammalia
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02724634_v24_n1_p214_DeIuliis
http://hdl.handle.net/20.500.12110/paper_02724634_v24_n1_p214_DeIuliis
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_02724634_v24_n1_p214_DeIuliis
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spelling paper:paper_02724634_v24_n1_p214_DeIuliis2023-06-08T15:25:09Z The Toro Negro megatheriine (Mammalia, Xenarthra): A new species of Pyramiodontherium and a review of Plesiomegatherium Ré, Guillermo Héctor fossil new species Pliocene Edentata Mammalia The fossil record of megatheriine ground sloths extends back to the middle Miocene, but only Pleistocene megatheriines are reasonably well understood. The taxonomy of pre-Pleistocene genera and species is not well-established. A partial megatheriine skeleton lacking the skull from the Pliocene Toro Negro Formation (La Rioja Province, Argentina) was originally assigned to Plesiomegatherium sp. This specimen forms the basis of Pyramiodontherium scillatoyanei, sp. nov. Py. scillatoyanei is notable for a relatively prominent humeral deltopectoral crest, a relatively short, robust calcaneum, and the largest crural index among sloths. The stronger humeral crests possibly imparted a relatively stronger ability in grappling. The higher crural indices of megatheriines and particularly of Pyramiodontherium, compared to those of mylodontids, suggest greater agility. The type species of Plesiomegatherium is Plesiomegatherium hansmeyeri, but unfortunately the genus was originally diagnosed almost entirely using the type species of Pyramiodontherium, Py. bergi. Few, if any, features can be used to define Plesiomegatherium. A second species assigned Plesiomegatherium, PL halmyronomum, is probably not congeneric with PL hansmeyeri, but sufficient evidence to unequivocally remove it from this genus is lacking. A third species, Plesiomegatherium triangulatum, is a nomen vanum. © 2004 by the Society of Vertebrate Paleontology. Fil:Ré, G.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02724634_v24_n1_p214_DeIuliis http://hdl.handle.net/20.500.12110/paper_02724634_v24_n1_p214_DeIuliis
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic fossil
new species
Pliocene
Edentata
Mammalia
spellingShingle fossil
new species
Pliocene
Edentata
Mammalia
Ré, Guillermo Héctor
The Toro Negro megatheriine (Mammalia, Xenarthra): A new species of Pyramiodontherium and a review of Plesiomegatherium
topic_facet fossil
new species
Pliocene
Edentata
Mammalia
description The fossil record of megatheriine ground sloths extends back to the middle Miocene, but only Pleistocene megatheriines are reasonably well understood. The taxonomy of pre-Pleistocene genera and species is not well-established. A partial megatheriine skeleton lacking the skull from the Pliocene Toro Negro Formation (La Rioja Province, Argentina) was originally assigned to Plesiomegatherium sp. This specimen forms the basis of Pyramiodontherium scillatoyanei, sp. nov. Py. scillatoyanei is notable for a relatively prominent humeral deltopectoral crest, a relatively short, robust calcaneum, and the largest crural index among sloths. The stronger humeral crests possibly imparted a relatively stronger ability in grappling. The higher crural indices of megatheriines and particularly of Pyramiodontherium, compared to those of mylodontids, suggest greater agility. The type species of Plesiomegatherium is Plesiomegatherium hansmeyeri, but unfortunately the genus was originally diagnosed almost entirely using the type species of Pyramiodontherium, Py. bergi. Few, if any, features can be used to define Plesiomegatherium. A second species assigned Plesiomegatherium, PL halmyronomum, is probably not congeneric with PL hansmeyeri, but sufficient evidence to unequivocally remove it from this genus is lacking. A third species, Plesiomegatherium triangulatum, is a nomen vanum. © 2004 by the Society of Vertebrate Paleontology.
author Ré, Guillermo Héctor
author_facet Ré, Guillermo Héctor
author_sort Ré, Guillermo Héctor
title The Toro Negro megatheriine (Mammalia, Xenarthra): A new species of Pyramiodontherium and a review of Plesiomegatherium
title_short The Toro Negro megatheriine (Mammalia, Xenarthra): A new species of Pyramiodontherium and a review of Plesiomegatherium
title_full The Toro Negro megatheriine (Mammalia, Xenarthra): A new species of Pyramiodontherium and a review of Plesiomegatherium
title_fullStr The Toro Negro megatheriine (Mammalia, Xenarthra): A new species of Pyramiodontherium and a review of Plesiomegatherium
title_full_unstemmed The Toro Negro megatheriine (Mammalia, Xenarthra): A new species of Pyramiodontherium and a review of Plesiomegatherium
title_sort toro negro megatheriine (mammalia, xenarthra): a new species of pyramiodontherium and a review of plesiomegatherium
publishDate 2004
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02724634_v24_n1_p214_DeIuliis
http://hdl.handle.net/20.500.12110/paper_02724634_v24_n1_p214_DeIuliis
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AT reguillermohector toronegromegatheriinemammaliaxenarthraanewspeciesofpyramiodontheriumandareviewofplesiomegatherium
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