Genus Polystephanosphaera
- Species total:
- 6
- Age range:
- 163.5 - 151 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Polystephanosphaera paracalatha | Callovian | Oxfordian |
|
| Polystephanosphaera valensii | Middle Callovian | Late Oxfordian |
|
| Polystephanosphaera paracalathus | Middle Callovian | Middle Callovian |
|
| Polystephanosphaera | Oxfordian | Oxfordian |
|
| Polystephanosphaera calatha | Oxfordian | Oxfordian |
|
| Polystephanosphaera calathus | Early Oxfordian | Early Oxfordian |
|