Americanus, a Latin adjective meaning American, may refer to.
The common merganser (North American) or goosander (Eurasian) (Mergus merganser) is a large duck of rivers and lakes in forested areas of Europe, northern and central Asia, and North America.
The kingcroakers, also known as kingfish, are a genus of fish, Menticirrhus, in the family Sciaenidae.
Menticirrhus americanus, the southern kingfish, southern kingcroaker, the king whiting, the Carolina whiting, or the sea mullet, is a species of marine fish in the family Sciaenidae.
Metasiro is a genus of mite harvestmen in the family Neogoveidae.
Monomitopus is a genus of cusk-eels.