- S. americanus
S. americanus may refer to:
* "
Samolus americanus ", a water rose
* "Schoenoplectus americanus ", a bulrush
* "Scyllarus americanus ", a lobster
* "Siphonorhis americanus ", a bird
* "Spondylus americanus ", an oyster
* "Styrax americanus ", a snowbell
* "Symbion americanus ", a microscopic symbiote of the American lobster
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