Dafila Stephens, Gen. Zool. (Shaw), xii, p. 126 (1824).
Type by mon., Anas acuta Linn.
This genus may be easily recognized by its elongate form, long neck and the lengthened and pointed tail-feathers, of which there are sixteen or, rarely, eighteen ; the bill is rather narrower proportionately than in the genus Anas and differs in having the end rather broader than the base ; the wings are long and pointed, the tarsus normal, the hind toe moderate with a narrow lobe.
The sexes differ in colour.
The genus is represented in India by one Winter visitor from the Northern Hemisphere.