Areosphaeridium |
Areosphaeridium polypetellum
|
Nd |
Nd |
|
Baltisphaeridium |
Baltisphaeridium lumectum
|
England(Dorset) |
Middle Callovian |
Late Oxfordian |
Baltisphaeridium |
Baltisphaeridium multispinosum
|
Canada(Alberta) |
Middle Albian |
|
Baltisphaeridium |
Baltisphaeridium polyozon
|
W.Germany |
Late Oligocene |
|
Baltisphaeridium |
Baltisphaeridium tribuliferum
|
England(Yorkshire) |
Oxfordian |
|
Baltisphaeridium |
Baltisphaeridium varispinosum
|
England(Yorkshire) |
Late Jurassic |
|
Chytroeisphaeridia |
Chytroeisphaeridia spinosa
|
Gabon |
Cenomanian |
Early Turonian |
Circulodinium |
Circulodinium australe
|
Australia(Queensland) |
Late Jurassic |
Aptian |
Circulodinium |
Circulodinium spinosum
|
Gabon |
Cenomanian |
Early Turonian |
Cleistosphaeridium |
Cleistosphaeridium
|
England(Isle of Wight) |
Early Eocene |
|
Cleistosphaeridium |
Cleistosphaeridium aciculare
|
Canada(Saskatchewan) |
Albian |
Cenomanian |
Cleistosphaeridium |
Cleistosphaeridium araneosum
|
Canada(NWT,Mackenzie) |
Hauterivian |
Middle Albian |
Cleistosphaeridium |
Cleistosphaeridium australe
|
Australia(Queensland) |
Late Jurassic |
Aptian |
Cleistosphaeridium |
Cleistosphaeridium baculatum
|
Pacific(S.China Sea) |
Late Oligocene |
|
Cleistosphaeridium |
Cleistosphaeridium bifurcatum
|
China(Hopei) |
Early Oligocene |
Middle Oligocene |
Cleistosphaeridium |
Cleistosphaeridium brevibaculum
|
Pacific(E.China Sea) |
Pleistocene |
|
Cleistosphaeridium |
Cleistosphaeridium brevispinosum
|
Senegal |
Early Aptian |
Late Aptian |