TABLE 1. — Comparison between Chloephaga dabbenei n in Pleistocene record of Chloephaga Eyton, 1838 (Anseriformes: Anatidae) in the Argentine Pampas, with the description of a new species

TABLE 1. — Comparison between Chloephaga dabbenei n. sp., PV-UNS-104 (Chloephaga picta (J.F.Gmelin, 1789)), PV-UNS-394 (Chloephaga sp.), from Bajo San José site, and extant tadornine taxa. Abbreviations: FL, femur length (the greatest length from the femoral trochanter to the lateral condyle); HDW, distal width of the humerus (the greatest width between epicondyles); HPW, humerus proximal width (the greatest distance between the dorsal and ventral tubercles); L/W T, tarsometatarsus ratio (the length of tarsometatarsus divided by the width between the most distal tip of the medial surface of trochlea II and the most distal tip of the lateral surface of trochlea IV); TL, tarsometatarsus length (the greatest length from the eminentia intercotylaris to trochlea III). Measurements of Oressochen melanopterus (Eyton, 1838) are taken from Watanabe (2017); and of C. hybrida (Molina, 1782) are taken from dry skins, based on Phillips (1916), Blake (1977), and Lefèvre (1989). *, Specimens of the subspecies C. picta leucoptera exclusive of the Malvinas Islands,and measured on dry skins by Blake (1977) yielded tarsus length values that range from 92 to 95 mm. Regrettably, no skeletal specimens of this form were available for present study; **, Lefèvre (1989) cited a putative specimen of C. picta having the exceptional size of 96.7 mm. of maximum metatarsal length. This specimen was housed in a private collection and is no longer available for further analysis, and thus, its measurements are not taken into consideration here.
TaxonHPWHDWFLTLL/W TChloephaga dabbenei n. sp.––89.996.34.96PV-UNS-104 (Chloephaga picta (J.F.Gmelin, 1789))26.6––––PV-UNS-394 (Chloephaga sp.)–16.8–––Chloephaga picta25.4-2721.4-23.673-89.376.3-93*,**4.38-4.77Chloephaga poliocephala P.L.Sclater, 185725.020.0-20.169.3-71.669.6-71.14.42Chloephaga hybrida (Molina, 1782)–––58-76–Chloephaga rubidiceps P.L.Sclater, 186123.6-24.619.4-20.275.4-75.660-76.84.74Oressochen melanopterus (Eyton, 1838)––75.280.6–