Genus Hystrichosphaeridium
- Species total:
- 513
- Age range:
- 4100 - 0 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Hystrichosphaeridium quadridactylites | Early Paleozoic | Late Devonian |
|
| Hystrichosphaeridium quadriradiatum | Early Ordovician | Early Ordovician |
|
| Hystrichosphaeridium radiculatum | Albian | Middle Eocene |
|
| Hystrichosphaeridium ramuliferum | Cretaceous | Middle Miocene |
|
| Hystrichosphaeridium ramusculosum | Tremadocian | Givetian |
|
| Hystrichosphaeridium raritanianum | Cenomanian | Early Turonian |
|
| Hystrichosphaeridium readei | Albian | Senonian |
|
| Hystrichosphaeridium recurvatum | Berriasian | Oligocene |
|
| Hystrichosphaeridium redonense | Holocene | Holocene |
|
| Hystrichosphaeridium rehdense | Middle Miocene | Middle Miocene |
|
| Hystrichosphaeridium reniforme | Albian | Albian |
|
| Hystrichosphaeridium replexum | Albian | Albian |
|
| Hystrichosphaeridium reticulatum | Llandeilian | Llandeilian |
|
| Hystrichosphaeridium retis | Late Devonian | Late Devonian |
|
| Hystrichosphaeridium rhabdophorum | Senonian | Senonian |
|
| Hystrichosphaeridium rhopalophorum | Cretaceous | Cretaceous |
|
| Hystrichosphaeridium rigens | Early Ordovician | Early Ordovician |
|