Arabisphaera |
Arabisphaera
|
Nd |
Carboniferous |
|
Cooksonella |
Cooksonella
|
Nd |
Tertiary |
|
Crassosphaera |
Crassosphaera
|
Nd |
Liassic |
Recent |
Crassosphaera |
Crassosphaera hexagonalis
|
France |
Liassic |
|
Crassosphaera |
Crassosphaera stellulata
|
Nd |
Tertiary |
|
Cymatiosphaera |
Cymatiosphaera
|
Nd |
Late Precambrian |
Recent |
Granodiscus |
Granodiscus
|
Nd |
Liassic |
|
Hungarodiscus |
Hungarodiscus
|
Nd |
Early Tertiary |
|
Leiosphaeridia |
Leiosphaeridia
|
Nd |
Late Precambrian |
Recent |
Leiosphaeridia |
Leiosphaeridia ferquensis
|
France |
Frasnian |
|
Maranhites |
Maranhites
|
Nd |
Devonian |
|
Margosphaera |
Margosphaera
|
Nd |
Tertiary |
|
Noremia |
Noremia
|
Nd |
Permian |
Early Tertiary |
Pachysphaera |
Pachysphaera pelagica
|
Mediterranean Sea |
Miocene |
|
Perisaccus |
Perisaccus
|
Nd |
Devonian |
|
Perisaccus |
Perisaccus laevigatus
|
France |
Frasnian |
|
Psilospora |
Psilospora
|
Nd |
Jurassic |
|