Acanthaulax |
Acanthaulax
|
Worldwide |
Late Jurassic |
|
Acanthaulax |
Acanthaulax angulosa
|
Nd |
Nd |
|
Acanthaulax |
Acanthaulax venusta
|
Nd |
Nd |
|
Achilleodinium |
Achilleodinium
|
Worldwide |
Eocene |
Early Oligocene |
Achilleodinium |
Achilleodinium biformoides
|
Nd |
Nd |
|
Achomosphaera |
Achomosphaera
|
Worldwide |
Late Cretaceous |
Tertiary |
Achomosphaera |
Achomosphaera ramulifera
|
Nd |
Nd |
|
Actinotheca |
Actinotheca
|
Worldwide |
Late Cretaceous |
Paleocene |
Actinotheca |
Actinotheca aphroditae
|
Nd |
Nd |
|
Adnatosphaeridium |
Adnatosphaeridium
|
Worldwide |
Late Jurassic |
Early Tertiary |
Adnatosphaeridium |
Adnatosphaeridium aemulum
|
Nd |
Nd |
|
Adnatosphaeridium |
Adnatosphaeridium vittatum
|
Nd |
Late Jurassic |
Early Tertiary |
Aiora |
Aiora
|
Worldwide |
Turonian |
Santonian |
Aiora |
Aiora fenestrata
|
Nd |
Turonian |
Santonian |
Aiora |
Aiora fenestrata
|
Nd |
Nd |
|
Aiora |
Aiora perforata
|
South Africa |
Turonian |
|
Aireiana |
Aireiana
|
Worldwide |
Eocene |
|