Genus Hystrichosphaeridium
- Species total:
- 513
- Age range:
- 4100 - 0 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Hystrichosphaeridium ocuminatum | Llandeilian | Llandeilian |
|
| Hystrichosphaeridium ohioense | Late Devonian | Early Mississippian |
|
| Hystrichosphaeridium oligacanthum | Danian | Danian |
|
| Hystrichosphaeridium oligofurcatum | Silurian | Late Llandoverian |
|
| Hystrichosphaeridium oligospinosum | Silurian | Silurian |
|
| Hystrichosphaeridium ordovicum | Ordovician | Ordovician |
|
| Hystrichosphaeridium pachydermum | Late Jurassic | Aptian |
|
| Hystrichosphaeridium palmatum | Hauterivian | Langhian |
|
| Hystrichosphaeridium paracostatum | Albian | Campanian |
|
| Hystrichosphaeridium paradoxum | Late Eocene | Middle Oligocene |
|
| Hystrichosphaeridium paraense | Early Miocene | Early Miocene |
|
| Hystrichosphaeridium parvispinum | Late Barremian | Late Barremian |
|
| Hystrichosphaeridium parvum | Campanian | Eocene |
|
| Hystrichosphaeridium pateum | Middle Cambrian | Middle Cambrian |
|
| Hystrichosphaeridium patriarchum | Silurian | Silurian |
|
| Hystrichosphaeridium pattei | Pliensbachian | Kimmeridgian |
|
| Hystrichosphaeridium patulum | Turonian | Middle Oligocene |
|