References – O

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O’Keefe, F. R. 2001b. Ecomorphology of plesiosaur flipper geometry. Journal of Evolutionary Biology, 14, 987-991.

O’Keefe, F. R. 2002. The evolution of plesiosaur and pliosaur morphotypes in the Plesiosauria (Reptilia: Sauropterygia). Palaeobiology, 28(1), 101-112.

O’Keefe, F. R. and Wahl, W. 2003a. Current taxonomic status of the plesiosaur Pantasaurus striatus from the Upper Jurassic Sundance Formation, Wyoming. Paludicola, 4, 37-46.

O’Keefe, F. R. and Wahl, W. 2003b. Preliminary report on the osteology and relationships of a new aberrant cryptocleidoid plesiosaur from the Sundance Formation, Wyoming. Paludicola, 4, 48-68.

O’Keefe, F. R. 2004a. On the cranial anatomy of the polycotylid plesiosaur, including new material of Polycotylus latipinnis. Journal of Vertebrate Paleontology, 24, 326-340.

O’Keefe, F. R. 2004b. Preliminary description and phylogenetic position of a new plesiosaur (Reptilia: Sauropterygia) from the Toarcian of Holzmaden, Germany. Journal of Paleontology, 78, 973-988.

Owen, R. 1865. A monograph on the fossil Reptilia of the Liassic Formations. Part 3. Sauropterygia. Monograph of the Palaeontographical Society, 17, 1-40, pl. 1-16.

Owen, R. 1869. Monograph on the British fossil Reptilia from the Kimmeridge Clay. Part 3, containing Pliosaurus grandis, P. trochanterius and P. portlandicus. Monograph of the Palaeontographical Society, 3,1-12, pl. 1-4.

Owen, R. 1883. On generic characters in the order Sauropterygia. Quarterly Journal of the Geological Society, 39, 133-138.