Aptea |
Aptea eisenackii
|
Nd |
Nd |
|
Aptea |
Aptea plera
|
England(Isle of Wight) |
Early Aptian |
|
Aptea |
Aptea polymorpha
|
W.Germany(Schleswig) |
Late Aptian |
|
Aptea |
Aptea securigera
|
Kansas |
Late Albian |
|
Aptea |
Aptea securigera
|
France(Alpes,Cote d'Azur) |
Early Aptian |
|
Australisphaera |
Australisphaera dolabella
|
England(Isle of Wight) |
Early Albian |
|
Australisphaera |
Australisphaera vitrea
|
England(Isle of Wight) |
Aptian |
|
Balmula |
Balmula
|
Kansas |
Late Albian |
|
Balmula |
Balmula pentaradiata
|
Canada(Alberta) |
Early Cenomanian |
|
Balmula |
Balmula tripenta
sp. nov. |
Kansas |
Late Albian |
|
Batioladinium |
Batioladinium micropodum
|
Netherlands |
Neocomian |
|
Ceratium |
Ceratium furcoides
|
California |
Recent |
|
Ceratium |
Ceratium hirundinella
|
California |
Recent |
|
Cyclonephelium |
Cyclonephelium brevispinatum
|
Kansas |
Late Albian |
|
Cyclonephelium |
Cyclonephelium chabaca
|
Kansas |
Late Albian |
|
Cyclonephelium |
Cyclonephelium eisenackii
|
Kansas |
Late Albian |
|
Cyclonephelium |
Cyclonephelium eisenackii
|
Canada(Saskatchewan) |
Cenomanian |
|