(syn. Netta Ϯ Red-crested Pochard N. rufina) Genus Mergus Linnaeus, 1758, merganser; Gr. -οιδης -oidēs resembling; "Gen. 283. CALLICHEN, Br. (Mergoides, Eyton) 422. CALLICHEN RUFINUS, Brehm. (Anas rufina, Pall.) Gould, pl. 369" (Bonaparte 1838 (April)); "GENUS VI. CALLICHEN ... MERGOIDES nobis. ... We first initiated this genus on F. rufina, after having observed the trachea of that species. ... Affinities. In having bulbs on the tube of the trachea, and also in general form, this bird presents considerable affinity to the Mergansers" (Eyton 1838 (June)).