| Scientific Name | Authority | Status |
|---|---|---|
| Orthoceras | R.Br. | accepted |
| Orthoceras novae-zeelandiae | (A.Rich.) M.A.Clem., D.L.Jones & Molloy | accepted |
| Orthoceras strictum | R.Br. | accepted |
| Holothrix orthoceras | (Harv.) Rchb.f. | accepted |
| Orthoceras rubrum | Colenso | synonym |
| Orthoceras caput-serpentis | Colenso | synonym |
| Orthoceras strictum f. viride | Hatch | synonym |
| Orthoceras solandri | Lindl. | synonym |
| Tryphia orthoceras | Harv. | synonym |
Elapsed time: 0.09573323279619217