A new thylacosmilid (Mammalia, Metatheria, Sparassodonta) from the Miocene of Patagonia, Argentina

FIGURE 2. Skull of Patagosmilus goini, specimen MLP 07 - VII- 1 - 1 in lateral view. Abbreviations: C, upper canine; fdv, foramen for the frontal diploic vein Fr, frontal; iof, infraorbital foramen; La, lacrimal; lat, lacrimal tuberosity; M 1 - M 4, upper molars, from the first to the fourth; Mx, maxilla; mxt, maxillary tuberosity; Na, nasal; P 3, third upper premolar; Pa, parietal; pop, postorbital process of frontal; sc, sagittal crest; Sq, squamosal; t l temporal line; spf, sphenopalatine foramen.

FIGURE 3. Stereographic photographs and line drawing of the upper dentition of Patagosmilus goini, specimen MLP 07 - VII- 1 - 1 in occlusal (A) and lingual (B) views. Abbreviations: ec, ectocingulum; me, metacone; n, nutrient foramina; P 2, alveoli for the anterior and posterior roots of second upper premolar; p, pit for housing the protoconid; pa, paracone; pme, postmetacrista; pr, protocone; ppa, preparacrista; st, stylar shelf.

FIGURE 4. Third upper premolar of Patagosmilus goini, specimen MLP 07 - VII- 1 - 1 in lingual (A) and labial (B) views. Abbreviations: alr, anterior labial root; lgr, lingual root; me, metacone; pa, paracone; pme, postmetacrista; pr, protocone; plr, posterior labial root;

FIGURE 5. Patagosmilus goini specimen MLP 07 - VII- 1 - 1. Magnum in lateral, anterior, and medial views from left to right (A), and proximal portion of an ungual phalanx in lateral view (B). Abbreviations: mcIII, facet for articulation with the third metacarpal; sc, facet for scaphoid; se, facet for semilunar; sp, subungual process; t, palmar tubercle; tra, facet for trapezoid; uc, ungicular crest; uf, ungual foramen; un, facet for unciform.

FIGURE 1. Location map of the fossil locality, at the west margin of the Río Chico (Colloncuran SALMA, middle Miocene), Rio Negro Province, where the holotype of Patagosmilus goini (MLP 07 - VII- 1 - 1) was found.