Sipalocyon gracilis Ameghino, 1887

MACN 647 (holotype; cast in MLP), fragment of right mandibular ramus with dentition ( Monte Observación locality) ; MACN 691-692 (casts in MLP), left mandibular ramus and right fragment of maxilla with dentition; MACN 5952-5953, fragmentary skull and broken left mandibular ramus; MACN-A 5958, left maxillary fragment with dentition; MLP 11-2, fragment of left mandibular ramus. All the specimens come from Santa Cruz Province, Argentina; Santa Cruz Formation, Santacrucian SALMA, early Miocene .

Additional information: Sinclair (1906); Cabrera (1927); Marshall (1981).