| Name | From | To | Age range |
|---|---|---|---|
| Orthosphaeridium | Early Ordovician | Ashgillian |
|
| Orthosphaeridium abbreviatum | Late Llanvirnian | Late Llanvirnian |
|
| Orthosphaeridium bispinosum | Arenigian | Early Ashgillian |
|
| Orthosphaeridium chondrodora | Cambrian | Ashgillian |
|
| Orthosphaeridium clavum | Early Paleozoic | Early Paleozoic |
|
| Orthosphaeridium densigranosum | Ordovician | Llandoverian |
|
| Orthosphaeridium densiverrucosum | Ordovician | Llandoverian |
|
| Orthosphaeridium extensum | Late Cambrian | Late Cambrian |
|
| Orthosphaeridium gaspesianum | Caradocian | Caradocian |
|
| Orthosphaeridium inflatum | Middle Ordovician | Ashgillian |
|
| Orthosphaeridium insculptum | Ordovician | Rhuddanian |
|
| Orthosphaeridium latispinosum | Late Llandeilian | Middle Caradocian |
|
| Orthosphaeridium macroceros | Early Paleozoic | Early Paleozoic |
|
| Orthosphaeridium occultatum | Late Llanvirnian | Late Llanvirnian |
|
| Orthosphaeridium octospinosum | Early Ordovician | Late Ordovician |
|
| Orthosphaeridium procerum | Llanvirnian | Llanvirnian |
|
| Orthosphaeridium quadricorne | Late Llanvirnian | Late Llanvirnian |
|