(Worthy 2009; Sun et al. 2017, except as noted)
Order: Anseriformes (Wagler, 1831) — ducks, geese, swans, screamers, waterfowl
Family: Anatidae — ducks, geese, swans
Genus: Radjah (Reichenbach, 1853)
Species: Radjah radjah (Lesson, 1828) — Radjah Shelduck
Subspecies: R. r. radjah (Lesson, 1828) — Moluccas Islands, New Guinea, Indonesia, and nearby islands
Subspecies: R. r. rufitergum (E. J. O. Hartert, 1905) — northern and eastern tropical Australia
Sources: Carboneras and Kirwan (2018), Gill and Donsker (2018)
An illustration of a Radjah Shelduck and two Common Shelducks by Louis Agassiz Fuentes (1922).
Plate 16 in John C. Phillip's A Natural History of Ducks, Volume 1 (1922).