P. americanus

P. americanus may refer to:
 * Parus americanus, a bird species in the genus Parus
 * Polyprion americanus, a wreckfish species
 * Potamogeton americanus, a pondweed species in the genus Potamogeton
 * Protomognathus americanus, an insect species
 * Pseudopleuronectes americanus, a flounder species