Genus Trachysphaeridium
- Species total:
- 122
- Age range:
- 4100 - 54.5 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Trachysphaeridium vidalii | Precambriam | Precambriam |
|
| Trachysphaeridium asemantum | Devonian | Devonian |
|
| Trachysphaeridium acis | Middle Proterozoic | Middle Proterozoic |
|