Apteodinium |
Apteodinium frontierense
|
Nd |
Nd |
|
Apteodinium |
Apteodinium granulatum
|
Nd |
Nd |
|
Aquadulcum |
Aquadulcum
|
Worldwide |
Holocene |
|
Aquadulcum |
Aquadulcum serpens
|
Nd |
Nd |
|
Araneosphaera |
Araneosphaera
|
Worldwide |
Middle Eocene |
Late Eocene |
Araneosphaera |
Araneosphaera araneosa
|
Nd |
Nd |
|
Areoligera |
Areoligera
|
Worldwide |
Early Cretaceous |
Tertiary |
Areoligera |
Areoligera senonensis
|
Nd |
Nd |
|
Areosphaeridium |
Areosphaeridium
|
Worldwide |
Early Tertiary |
|
Areosphaeridium |
Areosphaeridium diktyoplokum
|
Nd |
Nd |
|
Areosphaeridium |
Areosphaeridium multicornutum
|
Nd |
Nd |
|
Arkellidinium |
Arkellidinium
|
Worldwide |
Late Callovian |
|
Arkellidinium |
Arkellidinium triapertum
|
Nd |
Late Callovian |
|
Arpylorus |
Arpylorus
|
Worldwide |
Silurian |
|
Arpylorus |
Arpylorus antiquus
|
Nd |
Nd |
|
Artemisiocysta |
Artemisiocysta
|
Worldwide |
Middle Oligocene |
Late Oligocene |
Artemisiocysta |
Artemisiocysta cladodichotoma
|
Nd |
Nd |
|