Hystrichosphaeridium |
Hystrichosphaeridium lucidum
|
France(Finistere) |
Caradocian |
|
Hystrichosphaeridium |
Hystrichosphaeridium malleoferum
|
England |
Late Cretaceous |
|
Hystrichosphaeridium |
Hystrichosphaeridium mariannae
|
France |
Late Cretaceous |
|
Hystrichosphaeridium |
Hystrichosphaeridium meson
|
E.Germany(Rostock) |
Late Ludlovian |
|
Hystrichosphaeridium |
Hystrichosphaeridium mutabile
|
USSR(Baltic) |
Middle Cambrian |
|
Hystrichosphaeridium |
Hystrichosphaeridium nudatum
|
USSR(Pre-Baltic) |
Early Ordovician |
|
Hystrichosphaeridium |
Hystrichosphaeridium oligacanthum
|
Europe |
Danian |
|
Hystrichosphaeridium |
Hystrichosphaeridium oligacanthum
|
Europe |
Danian |
|
Hystrichosphaeridium |
Hystrichosphaeridium oligofurcatum
|
Baltic |
Late Llandoverian |
|
Hystrichosphaeridium |
Hystrichosphaeridium pateum
|
USSR(Pre-Baltic) |
Early Ordovician |
|
Hystrichosphaeridium |
Hystrichosphaeridium piriferum
|
Baltic |
Late Llandoverian |
|
Hystrichosphaeridium |
Hystrichosphaeridium placacanthum
|
Australia(Victoria) |
Miocene |
|
Hystrichosphaeridium |
Hystrichosphaeridium pseudhystrichodinium
|
France(Paris Basin) |
Senonian |
|
Hystrichosphaeridium |
Hystrichosphaeridium pseudhystrichodinium
|
W.Germany(Schleswig) |
Danian |
|
Hystrichosphaeridium |
Hystrichosphaeridium rhabdophorum
|
France(Cher) |
Senonian |
|
Leiosphaera |
Leiosphaera eisenackii
|
USSR(Pre-Baltic) |
Early Ordovician |
Middle Ordovician |
Leiosphaera |
Leiosphaera granulata
|
Nd |
Paleozoic |
|