Chloephaga picta (J.F.Gmelin, 1789)

Agnolín, Federico L., Álvarez Herrera, Gerardo P. & Tomassini, Rodrigo, 2024, Pleistocene record of Chloephaga Eyton, 1838 (Anseriformes: Anatidae) in the Argentine Pampas, with the description of a new species, Comptes Rendus Palevol 23 (18), pp. 241-255 : 250

publication ID	https://doi.org/ 10.5852/cr-palevol2024v23a18
publication LSID	urn:lsid:zoobank.org:pub:DA010DA2-D34B-4ABD-AE36-DF1782751589
persistent identifier	https://treatment.plazi.org/id/FF0B5869-FF90-FFF6-EA1A-D462FA7FF8B8
treatment provided by	Felipe
scientific name	Chloephaga picta (J.F.Gmelin, 1789)
status

Treatment

Chloephaga picta (J.F.Gmelin, 1789) View in CoL

( Figs 10 F-J; 11)

Anas picta J.F.Gmelin, 1789: 504 View in CoL .

REFERRED MATERIAL. — PV-UNS-104, proximal end of left humerus.

STRATIGRAPHIC PROVENANCE AND AGE. — Facies Sp, Lower Section of the San José Sequence. Middle Pleistocene.

DESCRIPTION AND COMPARISONS

The proximal end of the humerus in the different species of Chloephaga is very difficult to distinguish. The only clear difference resides in the shape of the pneumotricipital fossa. In posterior view, PV-UNS-104 and specimens of C. picta show a wider and more widely exposed fossa respect to the other species of the genus. Chloephaga poliocephala shows a flat surface that distally surrounds the pneumatic foramen of the pneumotricipital fossa is very wide and is well proximally delimited by a nearly continuous crest (interrupted and poorly defined in the other species). The pneumotricipital fossa is much smaller in Oressochen . In PV-UNS-104 and C. picta , the bicipital crest is proximodistally expanded and mediolaterally extended, whereas in C. rubidiceps it is very wide, but shorter and it is distally delimited by a marked concavity. In summary, PV-UNS-104 is indistinguishable in size and anatomical features from the extant C. picta , and consequently is referred to this taxon.