Genus Hystrichosphaeridium
- Species total:
- 513
- Age range:
- 4100 - 0 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Hystrichosphaeridium aemulum | Jurassic | Early Kimmeridgian |
|
| Hystrichosphaeridium aculeatum | Ordovician | Ordovician |
|
| Hystrichosphaeridium | Precambriam | Quaternary |
|