Genus Hystrichosphaeridium
- Species total:
- 513
- Age range:
- 4100 - 0 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Hystrichosphaeridium xipheum | Oligocene | Oligocene |
|
| Hystrichosphaeridium type 5 | Oligocene | Oligocene |
|
| Hystrichosphaeridium type 10 | Oligocene | Oligocene |
|
| Hystrichosphaeridium cinctum | Early Oligocene | Early Oligocene |
|
| Hystrichosphaeridium gracilis | Late Eocene | Late Eocene |
|
| Hystrichosphaeridium paradoxum | Late Eocene | Middle Oligocene |
|
| Hystrichosphaeridium dictyum | Bartonian | Bartonian |
|
| Hystrichosphaeridium tubulatum | Jackson | Jackson |
|
| Hystrichosphaeridium variabilis | Bartonian | Bartonian |
|
| Hystrichosphaeridium sp. Xu et al,1997 | Middle Eocene | Late Eocene |
|
| Hystrichosphaeridium sp. Levy & Harw.,2000 | Middle Eocene | Late Eocene |
|
| Hystrichosphaeridium ellipticum | Middle Eocene | Middle Eocene |
|
| Hystrichosphaeridium sp.B Sriv.& Bane.,1969 | Eocene | Oligocene |
|
| Hystrichosphaeridium sp.1 Math.,1963 | Eocene | Eocene |
|
| Hystrichosphaeridium sp.C Sriv.& Bane.,1969 | Eocene | Oligocene |
|
| Hystrichosphaeridium dictyostilum | Eocene | Oligocene |
|
| Hystrichosphaeridium cambayense | Eocene | Early Miocene |
|