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 |
|