O. rex
O. rex may refer to:
- Oecomys rex, the regal oecomys or king arboreal rice rat, a rodent species found in Guyana, Suriname, French Guiana and nearby parts of Venezuela and Brazil
- Ogasawarana rex, a land snail species endemic to Japan
- Othnielia rex, a hypsilophodont dinosaur species
See also
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This disambiguation page lists articles associated with the same abbreviated species scientific name.
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