Hystrichosphaeridium |
Hystrichosphaeridium brevifurcatum
|
Baltic |
Late Llandoverian |
|
Hystrichosphaeridium |
Hystrichosphaeridium erraticum
|
Baltic |
Late Llandoverian |
|
Hystrichosphaeridium |
Hystrichosphaeridium gotlandicum
|
Baltic |
Late Llandoverian |
|
Hystrichosphaeridium |
Hystrichosphaeridium mensula
|
Baltic |
Late Senonian |
Danian |
Hystrichosphaeridium |
Hystrichosphaeridium oligofurcatum
|
Baltic |
Late Llandoverian |
|
Hystrichosphaeridium |
Hystrichosphaeridium piriferum
|
Baltic |
Late Llandoverian |
|
Membranilarnax |
Membranilarnax liradiscoides
|
Baltic |
Late Cretaceous |
|
Membranilarnax |
Membranilarnax pterospermoides
|
Baltic |
Late Cretaceous |
|
Hystrichosphaera |
Hystrichosphaera mensula
|
Baltic |
Late Senonian |
Danian |
Baltisphaeridium |
Baltisphaeridium geometricum
|
Belgium |
Ypresian |
|
Baltisphaeridium |
Baltisphaeridium gilsonii
|
Belgium |
Holocene |
|
Hystrichosphaeridium |
Hystrichosphaeridium geometricum
|
Belgium |
Ypresian |
|
Micrhystridium |
Micrhystridium gilsonii
|
Belgium |
Holocene |
|
Baltisphaeridium |
Baltisphaeridium sannemannii
|
Canada |
Middle Devonian |
|
Baltisphaeridium |
Baltisphaeridium duvernayense
|
Canada |
Late Devonian |
|
Leiosphaeridia |
Leiosphaeridia belloyensis
|
Canada |
Middle Permian |
|
Leiosphaeridium |
Leiosphaeridium belloyense
|
Canada |
Middle Permian |
|