Genus Hystrichosphaeridae
- Species total:
- 20
- Age range:
- 4100 - 0.01 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Hystrichosphaeridae type 2 | Late Pennsylvanian | Late Tertiary |
|
| Hystrichosphaeridae type 3 | Late Pennsylvanian | Late Tertiary |
|
| Hystrichosphaeridae type 4 | Early Tertiary | Late Tertiary |
|