Genus Hystrichosphaeridium
- Species total:
- 513
- Age range:
- 4100 - 0 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Hystrichosphaeridium arborispinum | Valanginian | Priabonian |
|
| Hystrichosphaeridium armatum | Cretaceous | Cretaceous |
|
| Hystrichosphaeridium arrectum | Ordovician | Early Caradocian |
|
| Hystrichosphaeridium articulatum | Precambriam | Recent |
|
| Hystrichosphaeridium aruncium | Albian | Albian |
|
| Hystrichosphaeridium arundum | Hauterivian | Coniacian |
|
| Hystrichosphaeridium ashdodense | Pleistocene | Pleistocene |
|
| Hystrichosphaeridium asperum | Eocene | Eocene |
|
| Hystrichosphaeridium assamicum | Late Cretaceous | Late Cretaceous |
|
| Hystrichosphaeridium astarte | Silurian | Early Oligocene |
|
| Hystrichosphaeridium asterigerum | Valanginian | Albian |
|
| Hystrichosphaeridium asterium | Late Paleocene | Eocene |
|
| Hystrichosphaeridium asteroideum | Late Cretaceous | Late Cretaceous |
|
| Hystrichosphaeridium asymmetricum | Middle Clintonian | Santonian |
|
| Hystrichosphaeridium atavum | Late Precambrian | Middle Cambrian |
|
| Hystrichosphaeridium atlasiense | Cretaceous | Maestrichtian |
|
| Hystrichosphaeridium attadalense | Early Cenomanian | Early Cenomanian |
|