Genus Prototrematosphaeridium
- Species total:
- 3
- Age range:
- 4100 - 230 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Prototrematosphaeridium | Precambriam | Paleozoic |
|
| Prototrematosphaeridium holtedahlii | Vendian | Vendian |
|
| Prototrematosphaeridium sp | Cambrian | Cambrian |
|