Genus Hystrichosphaeridium
- Species total:
- 513
- Age range:
- 4100 - 0 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Hystrichosphaeridium xipheum | Oligocene | Oligocene |
|
| Hystrichosphaeridium zoharyi | Aptian | Oligocene |
|
| Hystrichosphaeridium zonale | Early Ordovician | Early Ordovician |
|