Nematosphaeropsis |
Nematosphaeropsis
|
Nd |
Late Jurassic |
Holocene |
Nematosphaeropsis |
Nematosphaeropsis lemniscata
|
Nd |
Nd |
|
Noctiluca |
Noctiluca
|
Nd |
Nd |
|
Nyktericysta |
Nyktericysta
|
Nd |
Nd |
|
Nyktericysta |
Nyktericysta davisii
|
Canada(NWT,Mackenzie) |
Albian |
|
Occisucysta |
Occisucysta
|
England |
Portlandian |
|
Ochetodinium |
Ochetodinium romanum
|
Nd |
Nd |
|
Ochetodinium |
Ochetodinium romanum
|
Nd |
Nd |
|
Odontochitina |
Odontochitina
|
Nd |
Nd |
|
Odontochitina |
Odontochitina cribropoda
|
Antarctica |
Santonian |
|
Oligosphaeridium |
Oligosphaeridium
|
Canada(NWT,Mackenzie) |
Valanginian |
|
Oligosphaeridium |
Oligosphaeridium
|
Nd |
Middle Jurassic |
Miocene |
Oligosphaeridium |
Oligosphaeridium abaculum
|
North Sea |
Barremian |
|
Oligosphaeridium |
Oligosphaeridium complex
|
Canada(NWT,Mackenzie) |
Valanginian |
|
Oligosphaeridium |
Oligosphaeridium patulum
|
England |
Kimmeridgian |
|
Ostreopsis |
Ostreopsis
|
Nd |
Nd |
|
Ovoidinium |
Ovoidinium
|
Nd |
Nd |
|