Genus Trachysphaeridium
- Species total:
- 122
- Age range:
- 4100 - 54.5 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Trachysphaeridium minutissimum | Cambrian | Silurian |
|
| Trachysphaeridium universalum | Cambrian | Downtonian |
|
| Trachysphaeridium leptodermum | Middle Llandoverian | Middle Devonian |
|
| Trachysphaeridium uspenskyi | Middle Proterozoic | Middle Devonian |
|
| Trachysphaeridium attenuatum | Precambriam | Devonian |
|
| Trachysphaeridium rugosum | Precambriam | Early Carboniferous |
|
| Trachysphaeridium sp.3 | Precambriam | Middle Carboniferous |
|
| Trachysphaeridium sp.1 | Precambriam | Middle Carboniferous |
|
| Trachysphaeridium sp.2 | Precambriam | Middle Carboniferous |
|
| Trachysphaeridium sp.4 | Precambriam | Middle Carboniferous |
|
| Trachysphaeridium sp | Precambriam | Carboniferous |
|
| Trachysphaeridium | Precambriam | Permian |
|
| Trachysphaeridium laminaritum | Precambriam | Thanetian |
|
| Trachysphaeridium magnum | Late Precambrian | Late Precambrian |
|
| Trachysphaeridium sp. Kuma.& Sriv.,1995 | Late Precambrian | Late Precambrian |
|
| Trachysphaeridium induratum | Early Cambrian | Early Cambrian |
|
| Trachysphaeridium compactum | Early Ludlovian | Early Ludlovian |
|