Genus Trachysphaeridium
- Species total:
- 122
- Age range:
- 4100 - 54.5 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Trachysphaeridium pruniforme | Early Precambrian | Early Precambrian |
|
| Trachysphaeridium prolixum | Middle Proterozoic | Early Cambrian |
|
| Trachysphaeridium plicatum | Late Ordovician | Ludlovian |
|
| Trachysphaeridium planum | Precambriam | Early Cambrian |
|
| Trachysphaeridium phalanxum | Late Llandoverian | Late Llandoverian |
|
| Trachysphaeridium pellucidum | Late Caradocian | Ludlovian |
|
| Trachysphaeridium patellare | Precambriam | Vendian |
|
| Trachysphaeridium parvilatum | Vendian | Vendian |
|
| Trachysphaeridium partiale | Precambriam | Early Cambrian |
|
| Trachysphaeridium parapertum | Proterozoic | Proterozoic |
|
| Trachysphaeridium opacum | Sinian | Silurian |
|
| Trachysphaeridium nevelense | Late Proterozoic | Cambrian |
|
| Trachysphaeridium myctum | Late Proterozoic | Cambrian |
|
| Trachysphaeridium minutum | Vendian | Early Cambrian |
|
| Trachysphaeridium minutissimum | Cambrian | Silurian |
|
| Trachysphaeridium minor | Precambriam | Arenigian |
|
| Trachysphaeridium medium | Late Sinian | Late Sinian |
|