Genus Hystrichosphaeridium
- Species total:
- 513
- Age range:
- 4100 - 0 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Hystrichosphaeridium type 1 | Tortonian | Tortonian |
|
| Hystrichosphaeridium tubulatum | Jackson | Jackson |
|
| Hystrichosphaeridium tubiferum | Late Jurassic | Recent |
|
| Hystrichosphaeridium tubifera | Albian | Maestrichtian |
|
| Hystrichosphaeridium tuberosum | Late Givetian | Late Givetian |
|
| Hystrichosphaeridium tuberatum | Tremadocian | Tremadocian |
|
| Hystrichosphaeridium tshunense | Middle Ordovician | Middle Ordovician |
|
| Hystrichosphaeridium truswelliae | Late Paleocene | Late Eocene |
|
| Hystrichosphaeridium truncigerum | Oxfordian | Middle Miocene |
|
| Hystrichosphaeridium truncatum | Late Devonian | Late Devonian |
|
| Hystrichosphaeridium trisulcum | Late Ordovician | Late Ordovician |
|
| Hystrichosphaeridium trispinosum | Ordovician | Mississippian |
|
| Hystrichosphaeridium trispiculare | Ordovician | Caradocian |
|
| Hystrichosphaeridium triradicosum | Albian | Albian |
|
| Hystrichosphaeridium triplicativum | Early Ordovician | Early Ordovician |
|
| Hystrichosphaeridium trifurcatum | Late Proterozoic | Early Devonian |
|
| Hystrichosphaeridium tridactylites | Cretaceous | Senonian |
|