Impletosphaeridium |
Impletosphaeridium bahiaense
|
Brazil |
Eocene |
Oligocene |
Hystrichosphaeridium |
Hystrichosphaeridium bahiaense
|
Brazil |
Eocene |
Oligocene |
Downiesphaeridium |
Downiesphaeridium multispinosum
|
Canada(Alberta) |
Middle Albian |
|
Baltisphaeridium |
Baltisphaeridium multispinosum
|
Canada(Alberta) |
Middle Albian |
|
Heterosphaeridium |
Heterosphaeridium araneosum
|
Canada(NWT,Mackenzie) |
Hauterivian |
Middle Albian |
Cleistosphaeridium |
Cleistosphaeridium araneosum
|
Canada(NWT,Mackenzie) |
Hauterivian |
Middle Albian |
Downiesphaeridium |
Downiesphaeridium aciculare
|
Canada(Saskatchewan) |
Albian |
Cenomanian |
Cleistosphaeridium |
Cleistosphaeridium aciculare
|
Canada(Saskatchewan) |
Albian |
Cenomanian |
Impletosphaeridium |
Impletosphaeridium bifurcatum
|
China(Hopei) |
Early Oligocene |
Middle Oligocene |
Cleistosphaeridium |
Cleistosphaeridium bifurcatum
|
China(Hopei) |
Early Oligocene |
Middle Oligocene |
Impletosphaeridium |
Impletosphaeridium commixtum
|
China(Hopei) |
Late Eocene |
Middle Oligocene |
Cleistosphaeridium |
Cleistosphaeridium commixtum
|
China(Hopei) |
Late Eocene |
Middle Oligocene |
Impletosphaeridium |
Impletosphaeridium minus
|
China(Hopei) |
Early Oligocene |
Middle Oligocene |
Cleistosphaeridium |
Cleistosphaeridium minus
|
China(Hopei) |
Early Oligocene |
Middle Oligocene |
Sentusidinium |
Sentusidinium bifidum
|
China(Hopei) |
Late Eocene |
Middle Oligocene |
Tenua |
Tenua bifidis
|
China(Hopei) |
Late Eocene |
Middle Oligocene |
Sentusidinium |
Sentusidinium panshanense
|
China(Hopei) |
Early Oligocene |
Middle Oligocene |