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Abstract:

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.

Registro:

Documento: Artículo
Título:The Toro Negro megatheriine (Mammalia, Xenarthra): A new species of Pyramiodontherium and a review of Plesiomegatherium
Autor:De Iuliis, G.; Ré, G.H.; Vizcaíno, S.F.
Filiación:Department of Zoology, University of Toronto, 25 Harbord Street, Toronto, ON, M5S 3G5, Canada
Faculty of Community Services and Health Sciences, George Brown College of Applied Arts and Technology, 200 King Street East, Toronto, ON, M5A 1J5, Canada
Laboratorio de Paleomagnetismo “Daniel A. Valendo”, Dpto. Ciencias Geológicas (FCEyN-UBA), Pab. 2 Ciudad Universitaria (1428), Buenos Aires, Argentina
Departamento Cientifico Paleontología de Vertebrados, Museo de La Plata, Paseo del Bosque s/n, La Plata, 1900, Argentina
Palabras clave:fossil; new species; Pliocene; Edentata; Mammalia
Año:2004
Volumen:24
Número:1
Página de inicio:214
Página de fin:227
DOI: http://dx.doi.org/10.1671/17.1
Título revista:Journal of Vertebrate Paleontology
Título revista abreviado:J. Vertebr. Paleontol.
ISSN:02724634
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02724634_v24_n1_p214_DeIuliis

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Citas:

---------- APA ----------
De Iuliis, G., Ré, G.H. & Vizcaíno, S.F. (2004) . The Toro Negro megatheriine (Mammalia, Xenarthra): A new species of Pyramiodontherium and a review of Plesiomegatherium. Journal of Vertebrate Paleontology, 24(1), 214-227.
http://dx.doi.org/10.1671/17.1
---------- CHICAGO ----------
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" . Journal of Vertebrate Paleontology 24, no. 1 (2004) : 214-227.
http://dx.doi.org/10.1671/17.1
---------- MLA ----------
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" . Journal of Vertebrate Paleontology, vol. 24, no. 1, 2004, pp. 214-227.
http://dx.doi.org/10.1671/17.1
---------- VANCOUVER ----------
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. J. Vertebr. Paleontol. 2004;24(1):214-227.
http://dx.doi.org/10.1671/17.1