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A new record of Lestodon armatus Gervais 1855 (Xenarthra, Mylodontidae) from the Quaternary of southern Brazil and remarks on its postcranial anatomy

2019; Taylor & Francis; Volume: 33; Issue: 2 Linguagem: Inglês

10.1080/08912963.2019.1597075

1029-2381

Dilson Vargas-Peixoto, Cícero Schneider Colusso, Átila Augusto Stock Da‐Rosa, Leonardo Kerber,

Amphibian and Reptile Biology

Mylododontidae (Xenarthra: Folivora) includes ground sloths of medium to large size. Lestodon armatus is a mylodontid that have been found in Pleistocene fossiliferous deposits of South America, with most of its records at the southern portion of the continent. Here, we reported a new specimen assigned to this species recovered from a Quaternary deposit in Caçapava do Sul, southern Brazil. The specimen is composed of cranial fragments, vertebrae, articulated hind limb and pes, as well as other post-cranial elements. We described the post-cranial morphology of this specimen, including some elements not yet described for this species, such as the ossified meniscus, cyamo-fabella, and the fusion of the tibia and fibula. The new record contributes to the knowledge on the anatomy of L. armatus as well as to the study of the diversity of the extinct mammalian fauna from southern Brazil.