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Keywords:

  • Soriacebus;
  • Carlocebus;
  • Dolichocebus;
  • Pinturas formation;
  • Positional behavior

Abstract

Five platyrrhine tali have been recovered from early Miocene localities in the Pinturas Formation of Santa Cruz Province, Argentina. These new fossil tali show overall greater similarities to the slightly older Gaiman talus attributed to Dolichocebus gaimanensis than to tali of the younger primate taxa from La Venta, Colombia. The smallest and oldest talus from the Pinturas Formation displays features similar to the extant atelines and Pithecia, and is provisionally referred to Soriacebus ameghinorum. The four larger Pinturas tali are provisionally referred to Carlocebus cf. carmenensis, and most resemble tali of the extant small-bodied cebids and callitrichids. The differences in talar morphology exhibited by these two genera suggest that Soriacebus had a more derived locomotor repertoire than Carlocebus, which included more climbing and possibly suspensory behaviors.