P. nanus may refer to: Philautus nanus, an extinct frog species endemic to Sri Lanka Phrynobatrachus nanus, a frog species found in Chad and possibly Central African Republic Phrynopus nanus, a frog species endemic to Colombia Physalaemus nanus, a frog species endemic to Brazil Pleurocoelus nanus, a dinosaur species from the Early Cretaceous found in North America Pseudomys nanus, the western chestnut mouse, a rodent species found only in Australia Pyrgulopsis nanus, the distal-gland springsnail, a freshwater snail species See also Nanus (disambiguation)