Genus Microsphaeridium
- Species total:
- 2
- Age range:
- 35.67 - 22.5 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Microsphaeridium | Late Oligocene | Late Oligocene |
|
| Microsphaeridium ancistroides | Middle Rupelian | Late Oligocene |
|