Genus Arcosphaeridium
- Species total:
- 3
- Age range:
- 500 - 436.67 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Arcosphaeridium | Ordovician | Middle Ashgillian |
|
| Arcosphaeridium diversispinosum | Late Caradocian | Middle Ashgillian |
|
| Arcosphaeridium poriferum | Middle Ashgillian | Middle Ashgillian |
|