Genus Trachysphaeridium
- Species total:
- 122
- Age range:
- 4100 - 54.5 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Trachysphaeridium concatervatum | Sinian | Sinian |
|
| Trachysphaeridium complanatum | Middle Proterozoic | Middle Proterozoic |
|
| Trachysphaeridium compactum | Early Ludlovian | Early Ludlovian |
|
| Trachysphaeridium chihsienense | Precambriam | Precambriam |
|
| Trachysphaeridium caoshanense | Sinian | Sinian |
|
| Trachysphaeridium bavlensum | Vendian | Early Cambrian |
|
| Trachysphaeridium bavlense | Precambriam | Early Cambrian |
|
| Trachysphaeridium attenuatum | Precambriam | Devonian |
|
| Trachysphaeridium atteniatum | Late Vendian | Late Vendian |
|
| Trachysphaeridium asperatum | Cambrian | Silurian |
|
| Trachysphaeridium asemantum | Devonian | Devonian |
|
| Trachysphaeridium asaphym | Vendian | Vendian |
|
| Trachysphaeridium asaphum | Middle Proterozoic | Early Cambrian |
|
| Trachysphaeridium araneosum | Precambriam | Precambriam |
|
| Trachysphaeridium apertum | Precambriam | Vendian |
|
| Trachysphaeridium angulatum | Sinian | Silurian |
|
| Trachysphaeridium adornatum | Sinian | Sinian |
|