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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Autores principales:	De Iuliis, G., Ré, G.H., Vizcaíno, S.F.
Formato:	JOUR
Materias:	fossil new species Pliocene Edentata Mammalia
Acceso en línea:	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

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spelling	todo:paper_02724634_v24_n1_p214_DeIuliis2023-10-03T15:15:04Z The Toro Negro megatheriine (Mammalia, Xenarthra): A new species of Pyramiodontherium and a review of Plesiomegatherium De Iuliis, G. Ré, G.H. Vizcaíno, S.F. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 De Iuliis, G. Ré, G.H. Vizcaíno, S.F. 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.
format	JOUR
author	De Iuliis, G. Ré, G.H. Vizcaíno, S.F.
author_facet	De Iuliis, G. Ré, G.H. Vizcaíno, S.F.
author_sort	De Iuliis, G.
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
url	http://hdl.handle.net/20.500.12110/paper_02724634_v24_n1_p214_DeIuliis
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The Toro Negro megatheriine (Mammalia, Xenarthra): A new species of Pyramiodontherium and a review of Plesiomegatherium

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