O. gladiator, [341], [375]

Orcella, [376];

O. brevirostris, [376];

O. fluminalis, [376]

Oreinomys, [475]

Oreodon, [330]

Oreodontidae, [330]

Oreopithecus bambolii, [569]

Oreotragus saltator, [310]

Orias, [316];