Genus Hystrichosphaeridium
- Species total:
- 513
- Age range:
- 4100 - 0 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Hystrichosphaeridium mespilanum | Nd | Nd |
|
| Hystrichosphaeridium tshunense | Middle Ordovician | Middle Ordovician |
|
| Hystrichosphaeridium paucifurcatum | Early Tertiary | Early Tertiary |
|