Pseudoceratium |
Pseudoceratium gochtii
|
Nd |
Nd |
|
Pseudoceratium |
Pseudoceratium gochtii
|
England(Yorkshire) |
Late Hauterivian |
Middle Barremian |
Pseudoceratium |
Pseudoceratium ludbrookiae
|
Nd |
Nd |
|
Pseudoceratium |
Pseudoceratium nudum
|
Nd |
Late Hauterivian |
|
Pseudoceratium |
Pseudoceratium parvum
|
Nd |
Early Barremian |
|
Pseudoceratium |
Pseudoceratium pelliferum
|
Nd |
Valanginian |
Hauterivian |
Pseudoceratium |
Pseudoceratium regium
|
Nd |
Middle Albian |
Late Albian |
Pseudoceratium |
Pseudoceratium robustum
|
Nd |
Early Barremian |
|
Pseudoceratium |
Pseudoceratium tetracanthum
|
Nd |
Nd |
|
Pseudoceratium |
Pseudoceratium turneri
|
Nd |
Aptian |
Albian |
Pseudodeflandrea |
Pseudodeflandrea gigantea
|
Nd |
Middle Oligocene |
|
Pterocystidiopsis |
Pterocystidiopsis angulosa
|
Nd |
Late Jurassic |
|
Pterocystidiopsis |
Pterocystidiopsis ornata
|
Nd |
Late Cretaceous |
|
Pterocystidiopsis |
Pterocystidiopsis stephaniana
|
Nd |
Nd |
|
Pterocystidiopsis |
Pterocystidiopsis velata
|
Nd |
Nd |
|
Pterodinium |
Pterodinium aliferum
|
Nd |
Late Aptian |
|
Pterodinium |
Pterodinium circumsutum
|
Nd |
Early Oligocene |
|