Melitasphaeridium |
Melitasphaeridium simpulum
|
Australia(Victoria) |
Pliocene |
|
Mendicodinium |
Mendicodinium
|
Nd |
Nd |
|
Mendicodinium |
Mendicodinium caperatum
|
Italy |
Early Toarcian |
|
Meristaulax |
Meristaulax
|
Nd |
Nd |
|
Mikrocysta |
Mikrocysta
|
Spitsbergen |
Toarcian |
|
Muderongia |
Muderongia
|
Nd |
Nd |
|
Muderongia |
Muderongia asymmetrica
|
Canada(NWT,Mackenzie) |
Aptian |
Early Albian |
Muderongia |
Muderongia testudinaria
|
Australia(Queensland) |
Hauterivian |
|
Nelchinopsis |
Nelchinopsis
|
Nd |
Nd |
|
Nelchinopsis |
Nelchinopsis kostromiensis
|
Nd |
Nd |
|
Nematosphaeropsis |
Nematosphaeropsis
|
Nd |
Nd |
|
Nematosphaeropsis |
Nematosphaeropsis elegantula
|
California |
Danian |
|
Nematosphaeropsis |
Nematosphaeropsis pusulosa
|
W.Germany |
Early Oligocene |
|
Nematosphaeropsis |
Nematosphaeropsis quinquetra
|
England(Yorkshire) |
Middle Barremian |
|
Nexosispinum |
Nexosispinum
|
Nd |
Nd |
|
Nexosispinum |
Nexosispinum hesperus
|
Atlantic(Bay of Biscay) |
Aptian |
Albian |
Ochetodinium |
Ochetodinium
|
California |
Early Eocene |
Middle Eocene |