Hystrichosphaeridium |
Hystrichosphaeridium irregulare
|
Canada(Alberta) |
Late Barremian |
Aptian |
Cordosphaeridium |
Cordosphaeridium erectum
|
Canada(Arctic) |
Albian |
Turonian |
Hystrichosphaeridium |
Hystrichosphaeridium erectum
|
Canada(Arctic) |
Albian |
Turonian |
Leptodinium |
Leptodinium delicatum
|
Canada(Saskatchewan) |
Cenomanian |
|
Gonyaulacysta |
Gonyaulacysta delicata
|
Canada(Saskatchewan) |
Cenomanian |
|
Leptodinium |
Leptodinium aculeatum
|
Caribbean |
Pleistocene |
Recent |
Leptodinium |
Leptodinium sphaericum
|
Caribbean |
Pleistocene |
Recent |
Leptodinium |
Leptodinium paradoxum
|
Caribbean |
Miocene |
Recent |
Leptodinium |
Leptodinium strialatum
|
Caribbean |
Miocene |
Recent |
Litosphaeridium |
Litosphaeridium crassipes
|
England |
Late Cretaceous |
|
Polysphaeridium |
Polysphaeridium simplex
|
England |
Late Cretaceous |
|
Gonyaulacysta |
Gonyaulacysta exilicristata
|
England |
Late Cretaceous |
|
Gonyaulacysta |
Gonyaulacysta fetchamensis
|
England |
Late Cretaceous |
|
Gonyaulacysta |
Gonyaulacysta whitei
|
England |
Late Cretaceous |
|
Gonyaulacysta |
Gonyaulacysta aichmetes
|
England |
Early Cretaceous |
|
Gonyaulacysta |
Gonyaulacysta axicerastes
|
England |
Early Cretaceous |
|
Gonyaulacysta |
Gonyaulacysta episoma
|
England |
Early Cretaceous |
|