Casarca Bonaparte, Comp. Geog. List Birds Eur. & N. Am,, p. 56 (1838).
Type by mon., Anas ferruginea Vroeg.
The genus Casarca is very close to Tadorna, in which it is included by some systematists. It differs in its straighter bill, which is less hooked at the tip; the tail is short, rounded and of fourteen feathers as in Tadorna. The sexes differ very slightly. Both sexes have a rudimentary spur on the carpal joint. One species occurs in India.