O. roseus may refer to: Odontamblyopus roseus, an eel goby species found in muddy-bottomed coastal waters along the west coast of India Opisthopatus roseus, the pink velvet worm, a species in the Phylum Onychophora Osedax roseus, a polychaete worm which feeds upon the bones found in the carcasses of whales
See also Roseus (disambiguation)