Lejeunecysta |
Lejeunecysta laevigata
|
Gabon |
Senonian |
|
Deflandrea |
Deflandrea laevigata
|
Gabon |
Senonian |
|
Acanthaulax |
Acanthaulax venusta
|
Nd |
Nd |
|
Achilleodinium |
Achilleodinium biformoides
|
Nd |
Nd |
|
Achomosphaera |
Achomosphaera ramulifera
|
Nd |
Nd |
|
Actinotheca |
Actinotheca aphroditae
|
Nd |
Nd |
|
Adnatosphaeridium |
Adnatosphaeridium vittatum
|
Nd |
Late Jurassic |
Early Tertiary |
Aiora |
Aiora fenestrata
|
Nd |
Turonian |
Santonian |
Aireiana |
Aireiana verrucosa
|
Nd |
Eocene |
|
Aldorfia |
Aldorfia aldorfensis
|
Nd |
Middle Jurassic |
Late Cretaceous |
Alisocysta |
Alisocysta circumtabulata
|
Nd |
Nd |
|
Alterbia |
Alterbia recticornis
|
Nd |
Nd |
|
Ambonosphaera |
Ambonosphaera calloviana
|
Nd |
Nd |
|
Amiculosphaera |
Amiculosphaera umbraculum
|
Nd |
Nd |
|
Amphidiadema |
Amphidiadema denticulata
|
Nd |
Nd |
|
Amphorosphaeridium |
Amphorosphaeridium fenestratum
|
Nd |
Nd |
|
Amphorula |
Amphorula metaelliptica
|
Nd |
Nd |
|