Aireiana |
Aireiana salicta
|
Nd |
Nd |
|
Aireiana |
Aireiana verrucosa
|
Nd |
Eocene |
|
Aldorfia |
Aldorfia
|
Worldwide |
Middle Jurassic |
Late Cretaceous |
Aldorfia |
Aldorfia aldorfensis
|
Nd |
Middle Jurassic |
Late Cretaceous |
Aldorfia |
Aldorfia deflandrei
|
Nd |
Nd |
|
Alisocysta |
Alisocysta
|
Worldwide |
Paleocene |
Eocene |
Alisocysta |
Alisocysta circumtabulata
|
Nd |
Nd |
|
Alterbia |
Alterbia
|
Worldwide |
Late Cretaceous |
Early Tertiary |
Alterbia |
Alterbia distincta
|
Nd |
Nd |
|
Alterbia |
Alterbia pilosa
|
Nd |
Nd |
|
Alterbia |
Alterbia recticornis
|
Nd |
Nd |
|
Ambonosphaera |
Ambonosphaera
|
Worldwide |
Middle Jurassic |
Late Jurassic |
Ambonosphaera |
Ambonosphaera calloviana
|
Nd |
Nd |
|
Amiculosphaera |
Amiculosphaera
|
Worldwide |
Late Miocene |
Early Pleistocene |
Amiculosphaera |
Amiculosphaera umbraculum
|
Nd |
Nd |
|
Amphidiadema |
Amphidiadema
|
Worldwide |
Senonian |
|
Amphidiadema |
Amphidiadema denticulata
|
Nd |
Nd |
|