Hystrichosphaeridium |
Hystrichosphaeridium eoplanctonicum
|
E.Germany(Rostock) |
Late Ludlovian |
|
Hystrichosphaeridium |
Hystrichosphaeridium lewisii
|
France |
Middle Devonian |
|
Hystrichosphaeridium |
Hystrichosphaeridium meson
|
England(Shropshire) |
Ludlovian |
|
Hystrichosphaeridium |
Hystrichosphaeridium meson
|
E.Germany(Rostock) |
Late Ludlovian |
|
Hystrichosphaeridium |
Hystrichosphaeridium microspinosum
|
England(Shropshire) |
Ludlovian |
|
Hystrichosphaeridium |
Hystrichosphaeridium microspinosum
|
Baltic |
Late Llandoverian |
|
Hystrichosphaeridium |
Hystrichosphaeridium oligofurcatum
|
England(Shropshire) |
Ludlovian |
|
Hystrichosphaeridium |
Hystrichosphaeridium oligofurcatum
|
Baltic |
Late Llandoverian |
|
Hystrichosphaeridium |
Hystrichosphaeridium ramusculosum
|
England(Shropshire) |
Wenlockian |
Downtonian |
Hystrichosphaeridium |
Hystrichosphaeridium ramusculosum
|
France(Herault) |
Silurian |
|
Micrhystridium |
Micrhystridium
|
France(Paris Basin) |
Senonian |
|
Micrhystridium |
Micrhystridium imitatum
|
England(Shropshire) |
Wenlockian |
Downtonian |
Micrhystridium |
Micrhystridium imitatum
|
France(Herault) |
Ashgillian |
Downtonian |
Micrhystridium |
Micrhystridium inflatum
|
England(Shropshire) |
Ludlovian |
|
Micrhystridium |
Micrhystridium nannacanthum
|
England(Shropshire) |
Wenlockian |
Ludlovian |
Micrhystridium |
Micrhystridium picorricum
|
England(Shropshire) |
Ludlovian |
|
Micrhystridium |
Micrhystridium picorricum
|
Spain |
Middle Siegenian |
Emsian |