- A. americanus
A. americanus may refer to:
* "
Acorus americanus ", a sweet flag
* "Alces americanus ", a mammal
* "Amblyseius americanus ", a mite
* "Ammodytes americanus ", a sandlance
* "Anacanthobatis americanus ", a ray
* "Apogon americanus ", a cardinalfish
* "Aprostocetus americanus ", a hymenopteran insect
* "Arctus americanus ", a lobster
* "Argulus americanus ", a fish louse
* "Astragalus americanus ", a milkvetch
* "Astropecten americanus ", a starfish
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