Gonyaulacysta |
Gonyaulacysta perforobtusa
|
England |
Hauterivian |
|
Gonyaulacysta |
Gonyaulacysta piriformis
|
Belgium |
Maastrichtian |
|
Gonyaulacysta |
Gonyaulacysta polythyris
|
England |
Albian |
|
Gonyaulacysta |
Gonyaulacysta rara
|
India |
Tertiary |
|
Gonyaulacysta |
Gonyaulacysta teichos
|
England |
Early Barremian |
|
Gonyaulacysta |
Gonyaulacysta transparens
|
England |
Early Callovian |
|
Gonyaulacysta |
Gonyaulacysta variabilis
|
Canada |
Bajocian |
|
Gonyaulacysta |
Gonyaulacysta vozzhennikovae
|
England(Yorkshire) |
Early Oxfordian |
|
Gonyaulax |
Gonyaulax gottisi
|
France |
Early Oxfordian |
|
Gonyaulax |
Gonyaulax nannotrix
|
France(Jura) |
Kimmeridgian |
|
Hystrichosphaeropsis |
Hystrichosphaeropsis complanata
|
W.Germany |
Late Eocene |
Early Oligocene |
Hystrichosphaeropsis |
Hystrichosphaeropsis galeata
|
Australia |
Albian |
Cenomanian |
Hystrichosphaeropsis |
Hystrichosphaeropsis irisiae
|
Sweden |
Middle Maastrichtian |
Late Maastrichtian |
Hystrichosphaeropsis |
Hystrichosphaeropsis obscura
|
Atlantic Ocean |
Oligocene |
Miocene |
Hystrichosphaeropsis |
Hystrichosphaeropsis ovum
|
France |
Senonian |
|
Hystrichosphaeropsis |
Hystrichosphaeropsis pontiana
|
Romania |
Early Pliocene |
|
Hystrichosphaeropsis |
Hystrichosphaeropsis quasicribrata
|
Nd |
Nd |
|