Genus Hystrichosphaeridium
- Species total:
- 513
- Age range:
- 4100 - 0 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Hystrichosphaeridium arrectum | Ordovician | Early Caradocian |
|
| Hystrichosphaeridium armatum | Cretaceous | Cretaceous |
|
| Hystrichosphaeridium arborispinum | Valanginian | Priabonian |
|
| Hystrichosphaeridium araneosum | Nd | Nd |
|
| Hystrichosphaeridium aracajuense | Paleocene | Early Eocene |
|
| Hystrichosphaeridium aquitanicum | Tremadocian | Albian |
|
| Hystrichosphaeridium apiculatum | Ordovician | Ordovician |
|
| Hystrichosphaeridium anthophorum | Middle Ordovician | Albian |
|
| Hystrichosphaeridium anomale | Early Devonian | Early Devonian |
|
| Hystrichosphaeridium annulatum | Cambrian | Cambrian |
|
| Hystrichosphaeridium ancoriferum | Aptian | Paleocene |
|
| Hystrichosphaeridium amplum | Middle Clintonian | Late Clintonian |
|
| Hystrichosphaeridium amalthei | Liassic | Liassic |
|
| Hystrichosphaeridium alloiteauii | Caradocian | Caradocian |
|
| Hystrichosphaeridium alcicornu | Hauterivian | Middle Miocene |
|
| Hystrichosphaeridium albertense | Early Cretaceous | Late Cretaceous |
|
| Hystrichosphaeridium alagoense | Late Albian | Miocene |
|