Liocallonia oligomesa (H.A. Pilsbry, 1903)
Holospira orcutti P. Bartsch, 1925
Microceramus orientalis C.G. Aguayo, 1935
Holospira oritis H.A. Pilsbry & E.P. Cheatum,1951
Septilumen ornata (J. Gundlachin L. Pfeiffer, 1859)
Brachypodella oropuchensis G.C. Spence
Eucalodium otoides F.G. Thompson, 1968
Urocoptis ovata (G.P. Deshayes)
Pycnoptychia oviedoiana (A.V.M.D. D'Orbigny,1842)
Pycnoptychia oviedoiana fabreana (F. Poey in L. Pfeiffer,1858)
Holospira painteri P. Bartsch, 1906
Microceramus paivanus (L. Pfeiffer, 1866)
Microceramus palenquensis (J. Gundlachin L. Pfeiffer, 1863)
Tetrentodon palenquensis M.L. Jaume & C. de la Torre,1972
Brachypodella pallida L. Pfeiffer, 1845
Torrecoptis pallidula (C. de la Torre, 1912)
Liocallonia palmae (J. Gundlachin L. Pfeiffer, 1876)
Microceramus palmarensis C. de la Torre & P. Bartsch,1972
Crossostephanus palmeri W.H. Dall & P. Bartsch,1908
Hendersoniella palmeri (W.H. Dall, 1905)
Holospira palmeri P. Bartsch, 1906
Tetrentodon palmeri C. de la Torre & P. Bartsch,1972
Heterocoptis parallela (C. de la Torre, 1912)
Trilamellaxis parallela C. de la Torre & P. Bartsch,1972
Trilamellaxis parallela guajabanaensis C. de la Torre & P. Bartsch,1972
Macroceramus parallelus R. Arango in L. Pfeiffer,1866
Torrecoptis parvula C. de la Torre & P. Bartsch,1972
Haplocion pasonis (W.H. Dall, 1896)
Liocallonia patruelis (R. Arango, 1876)
Tetrentodon paucicostata C. de la Torre & P. Bartsch,1972
Torrecoptis paucicostata C. de la Torre & P. Bartsch,1972
Crossostephanus paucinoda F.G. Thompson& L.R. Correa-Sandoval, 1994
Macroceramus pazi J. Gundlach in L. Pfeiffer,1858
Mychostoma pearmanaeanum (E. Chitty, 1853)
Gongylostoma peccatrix C. de la Torre & P. Bartsch,1972