Protoleiosphaeridium |
Protoleiosphaeridium parvigranulosum
|
Canada(Alberta) |
Late Devonian |
|
Veryhachium |
Veryhachium duodeciaster
|
Canada(Alberta) |
Late Devonian |
|
Veryhachium |
Veryhachium sedecimspinosum
|
Canada(Alberta) |
Late Devonian |
|
Baltisphaeridium |
Baltisphaeridium ramispinosum
|
Canada(Alberta) |
Late Devonian |
|
Micrhystridium |
Micrhystridium echinosum
|
Canada(Alberta) |
Late Devonian |
|
Protoleiosphaeridium |
Protoleiosphaeridium granulosum
|
Canada(Alberta) |
Late Devonian |
|
Baltisphaeridium |
Baltisphaeridium sericum
|
Canada(Ontario) |
Early Devonian |
|
Micrhystridium |
Micrhystridium sericum
|
Canada(Ontario) |
Early Devonian |
|
Baltisphaeridium |
Baltisphaeridium bohemicum
|
Czechoslovakia |
Silurian |
|
Hystrichosphaeridium |
Hystrichosphaeridium bohemicum
|
Czechoslovakia |
Silurian |
|
Baltisphaeridium |
Baltisphaeridium intermedium
|
Denmark |
Late Senonian |
Danian |
Hystrichosphaera |
Hystrichosphaera intermedia
|
Denmark |
Late Senonian |
Danian |
Hystrichosphaerina |
Hystrichosphaerina
|
E.Germany |
Late Barremian |
Turonian |
Baltisphaeridium |
Baltisphaeridium meson
|
E.Germany(Rostock) |
Late Ludlovian |
|
Hystrichosphaeridium |
Hystrichosphaeridium meson
|
E.Germany(Rostock) |
Late Ludlovian |
|
Baltisphaeridium |
Baltisphaeridium fimbriatum
|
England |
Late Cretaceous |
|
Baltisphaeridium |
Baltisphaeridium malleoferum
|
England |
Late Cretaceous |
|