Rod Pycnocraspedum Alcock, 1889
- Pycnocraspedum armatum Gosline, 1954
- Pycnocraspedum fulvum Machida, 1984
- Pycnocraspedum microlepis (Matsubara, 1943)
- Pycnocraspedum phyllosoma (Parr, 1933)
- Pycnocraspedum squamipinne Alcock, 1889
Pisces → Actinopterygii → Ophidiiformes → Ophidiidae → Neobythitinae
Rod Pycnomma
- Pycnomma roosevelti Ginsburg, 1939
- Pycnomma semisquamatum Rutter, 1904
Actinopterygii > Perciformes > Gobiidae
Rod Pygidianops
- Pygidianops amphioxus de Pinna & Kirovsky, 2011
- Pygidianops cuao Schaefer, Provenzano, de Pinna & Baskin, 2005
- Pygidianops eigenmanni Myers, 1944
- Pygidianops magoi Schaefer, Provenzano, de Pinna & Baskin, 2005
Actinopterygii > Siluriformes > Trichomycteridae
Rod Pygocentrus
- Pygocentrus cariba (Humboldt, 1821)
- Pygocentrus nattereri Kner, 1858
- Pygocentrus palometa Valenciennes, 1850
- Pygocentrus piraya (Cuvier, 1819)
Actinopterygii → Characiformes → Serrasalmidae
Rod Pygoplites
- Pygoplites diacanthus (Boddaert, 1772)
Actinopterygii → Perciformes → Pomacanthidae
-
Pygoplites diacanthus
Rod Pygopristis
- Pygopristis denticulata (Cuvier, 1819)
Actinopterygii → Characiformes → Serrasalmidae
Rod Pylodictis
- Pylodictis olivaris (Rafinesque, 1818)
Actinopterygii > Siluriformes > Ictaluridae
-
Pylodictis olivaris
-
Pylodictis olivaris
-
Pylodictis olivaris
Rod Pylorobranchus McCosker & Hong-Ming Chen, 2013
- Pylorobranchus hearstorum McCosker, 2014
- Pylorobranchus hoi McCosker, Loh, Lin & Chen, 2012
Pisces → Actinopterygii → Anguilliformes → Ophichthidae
Rod Pyramodon
- Pyramodon lindas Markle & Olney, 1990
- Pyramodon parini Markle & Olney, 1990
- Pyramodon punctatus (Regan, 1914)
- Pyramodon ventralis Smith & Radcliffe, 1913
Actinopterygii > Ophidiiformes > Carapidae
Rod Pyrolycus
- Pyrolycus manusanus Machida & Hashimoto, 2002
- Pyrolycus moelleri Anderson, 2006
Actinopterygii > Perciformes > Zoarcidae
Rod Pyrrhulina
- Pyrrhulina australis Eigenmann & Kennedy, 1903
- Pyrrhulina beni Pearson, 1924
- Pyrrhulina brevis Steindachner, 1876
- Pyrrhulina eleanorae Fowler, 1940
- Pyrrhulina elongata Zarske & Géry, 2001
- Pyrrhulina filamentosa Valenciennes, 1847
- Pyrrhulina laeta (Cope, 1872)
- Pyrrhulina lugubris Eigenmann, 1922
- Pyrrhulina marilynae Netto-Ferreira & Marinho, 2013
- Pyrrhulina maxima Eigenmann & Eigenmann, 1889
- Pyrrhulina melanostoma (Cope, 1870)
- Pyrrhulina obermulleri Myers, 1926
- Pyrrhulina rachoviana Myers, 1926
- Pyrrhulina semifasciata Steindachner, 1876
- Pyrrhulina spilota Weitzman, 1960
- Pyrrhulina stoli Boeseman, 1953
- Pyrrhulina vittata Regan, 1912
- Pyrrhulina zigzag Zarske & Géry, 1997
Actinopterygii > Characiformes > Lebiasinidae
Rod Pythonichthys
- Pythonichthys asodes Rosenblatt & Rubinoff, 1972
- Pythonichthys macrurus (Regan, 1912)
- Pythonichthys microphthalmus (Regan, 1912)
- Pythonichthys sanguineus Poey, 1868
- Actinopterygii > Anguilliformes > Heterenchelyidae
Rod Pyxiloricaria
- Pyxiloricaria menezesi Isbrücker& Nijssen, 1984
Actinopterygii > Siluriformes > Loricariidae