Genus Trachysphaeridium
- Species total:
- 122
- Age range:
- 4100 - 54.5 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Trachysphaeridium asemantum | Devonian | Devonian |
|
| Trachysphaeridium raryplicatum | Ludlovian | Ludlovian |
|
| Trachysphaeridium compactum | Early Ludlovian | Early Ludlovian |
|
| Trachysphaeridium formosum | Wenlockian | Ludlovian |
|
| Trachysphaeridium phalanxum | Late Llandoverian | Late Llandoverian |
|
| Trachysphaeridium leptodermum | Middle Llandoverian | Middle Devonian |
|
| Trachysphaeridium inversalum | Llandoverian | Wenlockian |
|
| Trachysphaeridium tschapomicus | Late Caradocian | Ashgillian |
|
| Trachysphaeridium pellucidum | Late Caradocian | Ludlovian |
|
| Trachysphaeridium plicatum | Late Ordovician | Ludlovian |
|
| Trachysphaeridium undulatum | Late Tremadocian | Late Tremadocian |
|
| Trachysphaeridium sp.1 Comb.,1967 | Early Tremadocian | Early Tremadocian |
|
| Trachysphaeridium rugellosum | Ordovician | Ludlovian |
|
| Trachysphaeridium variabile | Early Tremadocian | Early Tremadocian |
|
| Trachysphaeridium textuplicatum | Ordovician | Silurian |
|
| Trachysphaeridium universalum | Cambrian | Downtonian |
|
| Trachysphaeridium minutissimum | Cambrian | Silurian |
|