Oligosphaeridium |
Oligosphaeridium complex
|
Africa |
Early Cretaceous |
Late Cretaceous |
Dinogymnium |
Dinogymnium acuminatum
|
Alabama |
Maastrichtian |
|
Heteraulacacysta |
Heteraulacacysta campanula
|
Alabama |
Middle Eocene |
|
Operculodinium |
Operculodinium placitum
|
Alabama |
Late Eocene |
|
Herendeenia |
Herendeenia pisciformis
|
Alaska |
Hauterivian |
Barremian |
Omatia |
Omatia butticula
|
Alaska |
Late Valanginian |
|
Cordosphaeridium |
Cordosphaeridium diktyoplokum
|
Antarctica |
Eocene |
Oligocene |
Cordosphaeridium |
Cordosphaeridium filosum
|
Antarctica |
Eocene |
|
Hystrichosphaeridium |
Hystrichosphaeridium echinatum
|
Argentina |
Late Cretaceous |
|
Thalassiphora |
Thalassiphora sueroi
|
Argentina |
Early Tertiary |
|
Membranilarnacia |
Membranilarnacia australis
|
Argentina |
Early Tertiary |
|
Oligosphaeridium |
Oligosphaeridium dictyostilum
|
Argentina |
Eocene |
Oligocene |
Membranilarnax |
Membranilarnax australis
|
Argentina |
Early Tertiary |
|
Hystrichosphaeridium |
Hystrichosphaeridium dictyostilum
|
Argentina |
Eocene |
Oligocene |
Cleistosphaeridium |
Cleistosphaeridium ancoriferum
|
Australia |
Albian |
Cenomanian |
Exochosphaeridium |
Exochosphaeridium striolatum
|
Australia |
Aptian |
Senonian |
Hystrichosphaera |
Hystrichosphaera cingulata
|
Australia |
Early Cretaceous |
Pleistocene |