Abstract
Recent paleontological fieldwork in southern Argentina has generated many new primate fossils from the early-middle Miocene Pinturas Formation in the northwestern part of Santa Cruz Province. This paper describes three new species — a small species of the previously described genus, Soriacebus, and two species of a new, larger genus more similar to Homunculus. A fossil primate from Colhuehuapian deposits at the Gran Barranca in nearby Chubut Province, previously assigned to Homunculus, is provisionally placed in the genus Soriacebus. All of the fossil platyrrhines from Santa Cruz Province have been repeatedly shown to have phenetic similarities to Aotus, Callicebus and pitheciines, but their phyletic relations are far from resolved.
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