S. americanus may refer to: Samolus americanus, a water rose species Schoenoplectus americanus, a bulrush species Scyllarus americanus, a lobster species in the genus Scyllarus Siphonorhis americanus, a bird species Spondylus americanus, an oyster species in the genus Spondylus Styrax americanus, a snowbell species in the genus Styrax Symbion americanus, a microscopic symbiote of the American lobster in the genus Symbion
See also Americanus (disambiguation)