Genus Trachysphaeridium
- Species total:
- 122
- Age range:
- 4100 - 54.5 MA (obsolete dating)
- IRMNG:
- find
Name | From | To | Age range |
---|---|---|---|
Trachysphaeridium compactum | Early Ludlovian | Early Ludlovian |
|
Trachysphaeridium raryplicatum | Ludlovian | Ludlovian |
|
Trachysphaeridium asemantum | Devonian | Devonian |
|