Genus Hymenosphaeridium
- Species total:
- 2
- Age range:
- 395 - 278 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Hymenosphaeridium multirugosa | Stephanian A | Stephanian D |
|
| Hymenosphaeridium planum | Early Gedinnian | Middle Devonian |
|