Genus Trochoaster
- Species total:
- 3
- Age range:
- 49 - 22.5 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Trochoaster | Nd | Nd |
|
| Trochoaster duplex | Middle Eocene | Late Eocene |
|
| Trochoaster simplex | Middle Eocene | Late Oligocene |
|