Hystrichosphaeridium |
Hystrichosphaeridium araneosum
|
Nd |
Nd |
|
Hystrichosphaeridium |
Hystrichosphaeridium armatum
|
France |
Cenomanian |
|
Hystrichosphaeridium |
Hystrichosphaeridium bahiaense
|
Brazil |
Eocene |
Oligocene |
Hystrichosphaeridium |
Hystrichosphaeridium ehrenbergii
|
England |
Oxfordian |
|
Hystrichosphaeridium |
Hystrichosphaeridium huguoniotii
|
France(Cher) |
Cretaceous |
|
Hystrichosphaeridium |
Hystrichosphaeridium multifurcatum
|
France(Paris Basin) |
Late Cretaceous |
|
Hystrichosphaeridium |
Hystrichosphaeridium oligacanthum
|
Europe |
Danian |
|
Hystrichosphaeridium |
Hystrichosphaeridium polytrichum
|
France(Vienne) |
Bathonian |
|
Hystrichosphaeridium |
Hystrichosphaeridium spiralisetum
|
Netherlands |
Maastrichtian |
|
Impletosphaeridium |
Impletosphaeridium
|
W.Germany(Rhineland) |
Early Eocene |
|
Impletosphaeridium |
Impletosphaeridium baculatum
|
Pacific(S.China Sea) |
Late Oligocene |
|
Impletosphaeridium |
Impletosphaeridium bahiaense
|
Brazil |
Eocene |
Oligocene |
Impletosphaeridium |
Impletosphaeridium bifurcatum
|
China(Hopei) |
Early Oligocene |
Middle Oligocene |
Impletosphaeridium |
Impletosphaeridium brevibaculum
|
Pacific(E.China Sea) |
Pleistocene |
|
Impletosphaeridium |
Impletosphaeridium clavulum
|
England(Surrey) |
Cenomanian |
|
Impletosphaeridium |
Impletosphaeridium commixtum
|
China(Hopei) |
Late Eocene |
Middle Oligocene |
Impletosphaeridium |
Impletosphaeridium ehrenbergii
|
England |
Oxfordian |
|