P. mystaceus

P. mystaceus may refer to:
 * Phidippus mystaceus, a species in the genus Phidippus
 * Phrynocephalus mystaceus, a species in the genus Phrynocephalus
 * Platyrinchus mystaceus, a species in the genus Platyrinchus
 * Proagonistes mystaceus, a species in the genus Proagonistes