Genus Hystrichosphaeridium
- Species total:
- 513
- Age range:
- 4100 - 0 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Hystrichosphaeridium cristatum | Tremadocian | Tremadocian |
|
| Hystrichosphaeridium scapigerum | Early Ordovician | Early Ordovician |
|
| Hystrichosphaeridium maximum | Early Ordovician | Early Ordovician |
|
| Hystrichosphaeridium polygonale | Ordovician | Ludlovian |
|
| Hystrichosphaeridium inconspicuum | Ordovician | Ordovician |
|
| Hystrichosphaeridium quadriradiatum | Early Ordovician | Early Ordovician |
|
| Hystrichosphaeridium arrectum | Ordovician | Early Caradocian |
|
| Hystrichosphaeridium spinellosum | Ordovician | Ordovician |
|
| Hystrichosphaeridium dictyophorum | Early Ordovician | Early Ordovician |
|
| Hystrichosphaeridium veliferum | Tremadocian | Tremadocian |
|
| Hystrichosphaeridium gdovia | Early Ordovician | Early Ordovician |
|
| Hystrichosphaeridium tuberatum | Tremadocian | Tremadocian |
|
| Hystrichosphaeridium triplicativum | Early Ordovician | Early Ordovician |
|
| Hystrichosphaeridium ferox | Early Ordovician | Oligocene |
|
| Hystrichosphaeridium monstruosum | Early Ordovician | Early Cenomanian |
|
| Hystrichosphaeridium marginatum | Early Ordovician | Early Ordovician |
|
| Hystrichosphaeridium trispiculare | Ordovician | Caradocian |
|