Hystrichosphaeridium |
Hystrichosphaeridium membranaceum
|
Nd |
Nd |
|
Hystrichosphaeridium |
Hystrichosphaeridium mensula
|
Baltic |
Late Senonian |
Danian |
Hystrichosphaeridium |
Hystrichosphaeridium meson
|
E.Germany(Rostock) |
Late Ludlovian |
|
Hystrichosphaeridium |
Hystrichosphaeridium microfurcatum
|
Nd |
Nd |
|
Hystrichosphaeridium |
Hystrichosphaeridium microspinosum
|
Nd |
Nd |
|
Hystrichosphaeridium |
Hystrichosphaeridium microtriainum
|
Nd |
Nd |
|
Hystrichosphaeridium |
Hystrichosphaeridium monacanthum
|
Nd |
Nd |
|
Hystrichosphaeridium |
Hystrichosphaeridium multifurcatum
|
Nd |
Nd |
|
Hystrichosphaeridium |
Hystrichosphaeridium multipilosum
|
Nd |
Nd |
|
Hystrichosphaeridium |
Hystrichosphaeridium mutabile
|
USSR(Baltic) |
Middle Cambrian |
|
Hystrichosphaeridium |
Hystrichosphaeridium nudatum
|
USSR(Pre-Baltic) |
Early Ordovician |
|
Hystrichosphaeridium |
Hystrichosphaeridium ohioense
|
USA |
Late Devonian |
|
Hystrichosphaeridium |
Hystrichosphaeridium oligacanthum
|
Nd |
Nd |
|
Hystrichosphaeridium |
Hystrichosphaeridium oligofurcatum
|
Baltic |
Late Llandoverian |
|
Hystrichosphaeridium |
Hystrichosphaeridium oligospinosum
|
Nd |
Nd |
|
Hystrichosphaeridium |
Hystrichosphaeridium ordovicum
|
Nd |
Nd |
|
Hystrichosphaeridium |
Hystrichosphaeridium pachydermum
|
Nd |
Nd |
|