| order | coextensive with the family Oleaceae |
|---|---|
| order | coextensive with the family Ophioglossaceae |
| order | harvestmen |
| order | coextensive with the family Cactaceae: cactuses |
| order | order of plants with irregular flowers having minute seeds: Orchidaceae |
| order | extinct terrestrial reptiles having birdlike pelvises: armored dinosaurs (thyreophorans) |
| order | grasshoppers and locusts |
| order | in some classifications considered a superorder comprising the Cypriniformes and the Siluriformes |
| order | extinct group of armored jawless vertebrates |
| order | coextensive with the family Palmae: palms |
| order | families Typhaceae |
| order | an order of dicotyledonous plants |