Artículo
The earliest well-documented occurrence of sexual dimorphism in extinct sloths: Evolutionary and palaeoecological insights
Boscaini, Alberto
; Gaudin, Timothy; Toledo, Néstor
; Mamani Quispe, Bernardino; Antoine, Pierre Olivier; Pujos, François Roger Francis
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Fecha de publicación:
04/2019
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Zoological Journal of the Linnean Society
ISSN:
0024-4082
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Sexual dimorphism (SD) is extremely common in species that have reproductive roles segregated into separate sexes, and it has been recognized in several mammalian lineages, both extant and extinct. Sexual dimorphism is low to moderate in living sloths, but it had a more important role for extinct sloth taxa. The presence of SD in extinct sloths was first suggested at the end of the 19th century and it is now commonly advocated as a possible explanation of high intraspecific variation in many extinct sloth species. In this paper, we report the presence of SD in Simomylodon uccasamamensis, a Late Miocene to Late Pliocene sloth from the Bolivian Altiplano. We present evidence of SD in the morphology of cranial and postcranial remains, representing the earliest unequivocal occurrence of size-based SD in an extinct sloth species. Differences between sexes are mainly observed in the morphology of the feeding apparatus and general body size. Comparisons with extant large mammals allow us to hypothesize different food selection between the two sexes, with probable divergent habitat use and concomitant niche separation. This, in turn, could have represented an important selective factor for adaptation to environmental changes experienced by the Bolivian Altiplano in Late Neogene times.
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Articulos(IANIGLA)
Articulos de INST. ARG. DE NIVOLOGIA, GLACIOLOGIA Y CS. AMBIENT
Articulos de INST. ARG. DE NIVOLOGIA, GLACIOLOGIA Y CS. AMBIENT
Citación
Boscaini, Alberto; Gaudin, Timothy; Toledo, Néstor; Mamani Quispe, Bernardino; Antoine, Pierre Olivier; et al.; The earliest well-documented occurrence of sexual dimorphism in extinct sloths: Evolutionary and palaeoecological insights; Wiley Blackwell Publishing, Inc; Zoological Journal of the Linnean Society; 187; 1; 4-2019; 229-239
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