- pyshmense, Teicherticeras pyshmense Erben 1960 † - (TEICHERTICERATIDAE) (FOSSIL)
- pyshmensis, Chebbites pyshmensis (Bogoslovsky, 1969 †) - (MIMOSPHINCTIDAE) (FOSSIL)
- pyshtensis, Semicassis pyshtensis W.O. Addicott, 1976 † - (CASSIDAE) (FOSSIL)
- pysiformis, Natica pysiformis C.A. Récluz, 1844 - syn of: Polinices mammilla (C. Linnaeus, 1758) - (NATICIDAE)
- pyta, Trajana pyta Gardner, 1948 † - (NASSARIIDAE) (FOSSIL)
- pythagoraica, Turritella pythagoraica Hilber, 1879 † - (TURRITELLIDAE) (FOSSIL)
- Pythia, Genus Pythia P.F. Röding, 1798 (ELLOBIIDAE)
- pythiella, Leiostyla pythiella A. Mousson, 1872 - syn of: Leiostyla taeniata (R.J. Shuttleworth, 1852) - (LAURIIDAE)
- Pythina, Genus Pythina R.B. Hinds, 1844 (LASAEIDAE)
- Pythinella, Genus Pythinella W.H. Dall, 1899 (LASAEIDAE)
- pythinoides, Circe pythinoides J.E. Tenison-Woods, 1878 - syn of: Gafrarium pectinatum (C. Linnaeus, 1758) - (VENERIDAE)
- Pythiopsis, Genus Pythiopsis C.L.F. von Sandberger, 1872 (ELLOBIIDAE)
- pythiusensis, Iberellus companyonii pythiusensis A. Bofill & J.B. Aguilar-Amat, 1924 - (HELICIDAE)
- Pythmenema, Genus Pythmenema † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Pythohelix, syn of: Genus Helicostyla A.E.J. Férussac, 1821 (BRADYBAENIDAE)
- python, Actinoceras python H.G. Bronn 1837 † - (ACTINOCERATIDAE) (FOSSIL)
- python, Deiroceras python (Billings, 1857 †) - (ORMOCERATIDAE) (FOSSIL)
- Pythonoceras, Genus Pythonoceras Zhuravleva, 1978 † (ORTHOCERIDA (UNASSIGNED)) (FOSSIL)
- pyttelilla, Parthenina pyttelilla (C.F.C. Schander, 1994) - (PYRAMIDELLIDAE)
- pyxidata, Anomiostrea pyxidata A. Adams & L.A. Reeve, 1850 - syn of: Anomiostrea coralliophila T. Habe, 1975 - (OSTREIDAE)
- pyxidata, Ostrea pyxidata I. von Born, 1778 - syn of: Minnivola pyxidata (I. von Born, 1778) - (OSTREIDAE)
- pyxidata, Minnivola pyxidata (I. von Born, 1778) - (PECTINIDAE)
- pyxidata, Odostomia pyxidata C.F.C. Schander, 1994 - (PYRAMIDELLIDAE)
- pyxidatus, Pecten pyxidatus I. von Born, 1778 - (PECTINIDAE)
- Pyxipoma, syn of: Genus Tenagodus J.É. Guettard, 1770 (SILIQUARIIDAE)
- Pyxipoma, syn of: Genus Tenagodus J.É. Guettard, 1770 (SILIQUARIIDAE)
- pyxis, Asymptoceras pyxis Shimanskiy, 1967 † - (AIPOCERATIDAE) (FOSSIL)
- pyxis, Georissa pyxis W.H. Benson - (HYDROCENIDAE)
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