Genus Annulum
- Species total:
- 4
- Age range:
- 597 - 435 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Annulum | Middle Cambrian | Tremadocian |
|
| Annulum difuminatum | Late Vendian | Ordovician |
|
| Annulum sp | Cambrian | Cambrian |
|
| Annulum squamaceum | Early Cambrian | Tremadocian |
|