Acanthaulax |
Acanthaulax senta
|
Worldwide |
Late Callovian |
Early Oxfordian |
Achilleodinium |
Achilleodinium biformoides
|
Worldwide |
Eocene |
Oligocene |
Achomosphaera |
Achomosphaera neptuni
|
Worldwide |
Late Berriasian |
Aptian |
Adnatosphaeridium |
Adnatosphaeridium aemulum
|
Worldwide |
Callovian |
Oxfordian |
Adnatosphaeridium |
Adnatosphaeridium caulleryi
|
Worldwide |
Callovian |
Kimmeridgian |
Adnatosphaeridium |
Adnatosphaeridium multispinosum
|
Worldwide |
Early Eocene |
Middle Eocene |
Adnatosphaeridium |
Adnatosphaeridium vittatum
|
Worldwide |
Early Eocene |
|
Aiora |
Aiora fenestrata
|
Worldwide |
Turonian |
Early Coniacian |
Aldorfia |
Aldorfia aldorfensis
|
Worldwide |
Late Bajocian |
Early Callovian |
Aldorfia |
Aldorfia deflandrei
|
Worldwide |
Late Albian |
Campanian |
Alisocysta |
Alisocysta circumtabulata
|
Worldwide |
Paleocene |
|
Alisocysta |
Alisocysta margarita
|
Worldwide |
Late Paleocene |
|
Amiculosphaera |
Amiculosphaera umbraculum
|
Worldwide |
Middle Miocene |
Early Pleistocene |
Amphidiadema |
Amphidiadema nucula
|
Worldwide |
Maastrichtian |
|
Amphidiadema |
Amphidiadema rectangularis
|
Worldwide |
Maastrichtian |
|
Amphorula |
Amphorula metaelliptica
|
Worldwide |
Kimmeridgian |
Portlandian |
Amphorula |
Amphorula metaelliptica
|
Worldwide |
Late Berriasian |
|