Genus Trachysphaeridium
- Species total:
- 122
- Age range:
- 4100 - 54.5 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Trachysphaeridium sp. Kuma.& Sriv.,1991 | Middle Proterozoic | Middle Proterozoic |
|
| Trachysphaeridium sp | Precambriam | Carboniferous |
|
| Trachysphaeridium simplex | Precambriam | Arenigian |
|
| Trachysphaeridium scadrum | Sinian | Sinian |
|
| Trachysphaeridium scabrum | Precambriam | Llanvirnian |
|
| Trachysphaeridium salebrosum | Late Riphean | Late Riphean |
|
| Trachysphaeridium ruminatum | Late Precambrian | Early Cambrian |
|
| Trachysphaeridium rugosum | Precambriam | Early Carboniferous |
|
| Trachysphaeridium rugellosum | Ordovician | Ludlovian |
|
| Trachysphaeridium rude | Precambriam | Precambriam |
|
| Trachysphaeridium robustum | Sinian | Sinian |
|
| Trachysphaeridium roblotum | Middle Riphean | Vendian |
|
| Trachysphaeridium rigidulum | Middle Proterozoic | Early Cambrian |
|
| Trachysphaeridium reticuloideum | Sinian | Sinian |
|
| Trachysphaeridium raryplicatum | Ludlovian | Ludlovian |
|
| Trachysphaeridium pusillum | Middle Proterozoic | Middle Proterozoic |
|
| Trachysphaeridium pulchriforme | Sinian | Cambrian |
|