Genus Hystrichosphaeridium
- Species total:
- 513
- Age range:
- 4100 - 0 MA (obsolete dating)
- IRMNG:
- find
Name | From | To | Age range |
---|---|---|---|
Hystrichosphaeridium simulatum | Middle Clintonian | Middle Clintonian |
|
Hystrichosphaeridium group b | Middle Clintonian | Late Clintonian |
|
Hystrichosphaeridium asymmetricum | Middle Clintonian | Santonian |
|
Hystrichosphaeridium pentaspinosum | Middle Clintonian | Late Clintonian |
|
Hystrichosphaeridium amplum | Middle Clintonian | Late Clintonian |
|
Hystrichosphaeridium calvum | Middle Clintonian | Late Clintonian |
|
Hystrichosphaeridium meson | Late Llandoverian | Late Ludlovian |
|
Hystrichosphaeridium quadrangulatum | Early Clintonian | Early Clintonian |
|
Hystrichosphaeridium group a | Clintonian | Clintonian |
|
Hystrichosphaeridium polytrichum | Tarannon | Oligocene |
|
Hystrichosphaeridium hibbardii | Early Clintonian | Early Clintonian |
|
Hystrichosphaeridium oligospinosum | Silurian | Silurian |
|
Hystrichosphaeridium multispinosum | Silurian | Late Clintonian |
|
Hystrichosphaeridium microspinosum | Silurian | Late Llandoverian |
|
Hystrichosphaeridium fluctuans | Silurian | Silurian |
|
Hystrichosphaeridium piriferum | Silurian | Late Llandoverian |
|
Hystrichosphaeridium astarte | Silurian | Early Oligocene |
|