Acanthodiacrodium |
Acanthodiacrodium numerosum
|
Nd |
Nd |
|
Acanthodiacrodium |
Acanthodiacrodium selectum
|
USSR |
Tremadocian |
|
Achilleodinium |
Achilleodinium biformoides
|
Germany |
Eocene |
|
Achomosphaera |
Achomosphaera alcicornu
|
England |
Eocene |
|
Achomosphaera |
Achomosphaera ramulifera
|
England |
Eocene |
|
Acrochaetium |
Acrochaetium
|
South Africa |
|
|
Actiniscus |
Actiniscus elegans
|
Nd |
Nd |
|
Actiniscus |
Actiniscus pentasterias
|
Nd |
Nd |
|
Actinophasis |
Actinophasis complunilata
|
Oklahoma |
Early Devonian |
|
Actinotodissus |
Actinotodissus longitaleosus
|
Oklahoma |
Middle Ordovician |
|
Actipilion |
Actipilion druggii
|
Oklahoma |
Late Ordovician |
|
Adnatosphaeridium |
Adnatosphaeridium reticulense
|
England |
Eocene |
|
Adnatosphaeridium |
Adnatosphaeridium robustum
|
Germany |
Early Eocene |
|
Adnatosphaeridium |
Adnatosphaeridium vittatum
|
Mississippi |
Late Eocene |
|
Aldorfia |
Aldorfia aldorfensis
|
Germany |
Jurassic |
|
Aldorfia |
Aldorfia deflandrei
|
France |
Late Cretaceous |
|
Alisocysta |
Alisocysta ornata
|
Australia |
Eocene |
|