Cleistosphaeridium |
Cleistosphaeridium selseyense
|
England |
Early Eocene |
Middle Eocene |
Cleistosphaeridium |
Cleistosphaeridium sphericum
|
Israel |
Late Jurassic |
|
Cleistosphaeridium |
Cleistosphaeridium spinulastrum
|
England(Isle of Wight) |
Early Eocene |
Middle Eocene |
Cleistosphaeridium |
Cleistosphaeridium tenue
|
Australia(Queensland) |
Paleocene |
|
Cleistosphaeridium |
Cleistosphaeridium tenuifilum
|
Australia(Victoria) |
Paleocene |
|
Cordosphaeridium |
Cordosphaeridium microtriainum
|
Belgium |
Bartonian |
|
Downiesphaeridium |
Downiesphaeridium
|
England(Isle of Wight) |
Middle Eocene |
|
Downiesphaeridium |
Downiesphaeridium aciculare
|
Canada(Saskatchewan) |
Albian |
Cenomanian |
Downiesphaeridium |
Downiesphaeridium armatum
|
France |
Cenomanian |
|
Downiesphaeridium |
Downiesphaeridium flexuosum
|
England |
Cenomanian |
|
Downiesphaeridium |
Downiesphaeridium multispinosum
|
Canada(Alberta) |
Middle Albian |
|
Downiesphaeridium |
Downiesphaeridium polyacanthum
|
France |
Early Kimmeridgian |
|
Downiesphaeridium |
Downiesphaeridium spinulastrum
|
England(Isle of Wight) |
Early Eocene |
Middle Eocene |
Heterosphaeridium |
Heterosphaeridium araneosum
|
Canada(NWT,Mackenzie) |
Hauterivian |
Middle Albian |
Heterosphaeridium |
Heterosphaeridium latoaculeum
|
W.Germany(N.Rhine) |
Early Santonian |
|
Heterosphaeridium |
Heterosphaeridium multifurcatum
|
France(Paris Basin) |
Late Cretaceous |
|
Hystrichosphaeridium |
Hystrichosphaeridium ancoriferum
|
Australia(W.Australia) |
Albian |
Cenomanian |