Colbertia sp.

Fernández, Mercedes, Zimicz, Ana N., Bond, Mariano, Chornogubsky, Laura, Arnal, Michelle, Cárdenas, Magalí & Fernicola, Juan C., 2021, New Eocene South American native ungulates from the Quebrada de los Colorados Formation at Los Cardones National Park, Argentina, Acta Palaeontologica Polonica 66 (1), pp. 85-97 : 92

Colbertia sp.

Fig. 3A, B .

Material.—IBIGEO-P 58a ( Fig. 3A ), left maxillary fragment with M2–M3, and IBIGEO-P 58b ( Fig. 3B ), left maxillary fragment with P4–M3. Quebrada Grande, Los Cardones National Park, Casamayoran SALMA.

Description.—IBIGEO-P 58a and 58b are poorly preserved, completely razed and heavily worn; only the M3 of IBIGEO-P 58a and the P4–M2 of IBIGEO-P 58b are better preserved, as their labial and lingual faces, respectively, are present. All cheek teeth are low-crowned and subquadrangular in outline; the well-developed protoloph and the metaloph are curved and united by their lingual ends, isolating a central fossette that runs disto-lingually.

Remarks.—According to the combination of characteristics described above, IBIGEO-P 58a and 58b are identified as belonging to the genus Colbertia . Unfortunately, and due to the bad preservation of the specimens and the general resemblance of the dental features of Colbertia lumbrerense and C. magellanica , it is not possible to establish if they belong to a given species within the genus, particularly because Colbertia falui is known only by its lower dentition. Due to all of this, IBIGEO-P 58a and 58b are considered here as Colbertia sp.

Figures

Fig. 3. New fossil specimens of Typotheria and Toxodontia from the Quebrada de Los Colorados Formation exposed at Quebrada Grande locality, Los Cardones National Park (Salta Province), Casamayoran SALMA. A, B. Colbertiasp. A. IBIGEO-P 58a, left maxillary fragment with M2–M3 in occlusal view.B. IBIGEO-P 58b, left maxillary fragment with P4–M3 in occlusal view.C–E. Pampahippus secundus Deraco and García-López, 2016. C. IBIGEO-P 62, right trigonid and incomplete talonid of a lower right molar in occlusal view. D. IBIGEO-P 63, fragmented left p3 or p4 in occlusal view. E. IBIGEO-P 64, left m1? in occlusal (E1), labial (E2), and lingual (E3) views. Photographs (A1–E1, E3, E4), explanatory drawings (A2–E2). Dashed area indicates broken or missing dental areas.