Hystrichosphaeridium |
Hystrichosphaeridium aculeatum
|
USSR(Pre-Baltic) |
Early Ordovician |
|
Hystrichosphaeridium |
Hystrichosphaeridium annulatum
|
USSR(Pre-Baltic) |
Early Ordovician |
|
Hystrichosphaeridium |
Hystrichosphaeridium apiculatum
|
USSR(Pre-Baltic) |
Early Ordovician |
|
Hystrichosphaeridium |
Hystrichosphaeridium armatum
|
France(Paris Basin) |
Late Senonian |
|
Hystrichosphaeridium |
Hystrichosphaeridium arrectum
|
USSR(Pre-Baltic) |
Early Ordovician |
Middle Ordovician |
Hystrichosphaeridium |
Hystrichosphaeridium bimarginatum
|
USSR(Pre-Baltic) |
Early Ordovician |
|
Hystrichosphaeridium |
Hystrichosphaeridium bohemicum
|
Czechoslovakia |
Silurian |
|
Hystrichosphaeridium |
Hystrichosphaeridium brevifurcatum
|
Baltic |
Late Llandoverian |
|
Hystrichosphaeridium |
Hystrichosphaeridium claviculorum
|
France(Calvados) |
Early Oxfordian |
|
Hystrichosphaeridium |
Hystrichosphaeridium cognitum
|
USSR(Pre-Baltic) |
Early Ordovician |
Middle Ordovician |
Hystrichosphaeridium |
Hystrichosphaeridium colligerum
|
Australia(Victoria) |
Early Eocene |
|
Hystrichosphaeridium |
Hystrichosphaeridium coniferum
|
W.Germany(Bavaria) |
Late Givetian |
|
Hystrichosphaeridium |
Hystrichosphaeridium corollatum
|
USSR(Pre-Baltic) |
Early Ordovician |
|
Hystrichosphaeridium |
Hystrichosphaeridium dictyophorum
|
New Guinea(Papua) |
Late Jurassic |
|
Hystrichosphaeridium |
Hystrichosphaeridium differtum
|
W.Germany(Bavaria) |
Late Givetian |
|
Hystrichosphaeridium |
Hystrichosphaeridium diploporum
|
USSR(Estonian SSR) |
Ordovician |
|
Hystrichosphaeridium |
Hystrichosphaeridium divergens
|
Poland |
Early Oligocene |
|