Micrhystridium |
Micrhystridium rigidum
|
Nd |
Jurassic |
|
Micrhystridium |
Micrhystridium robustum
|
England |
Tremadocian |
|
Micrhystridium |
Micrhystridium roquestii
|
France |
Middle Jurassic |
|
Micrhystridium |
Micrhystridium salopiense
|
England |
Late Gothlandian |
|
Micrhystridium |
Micrhystridium sannemannii
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium sanyanum
|
Baltic |
Paleocene |
|
Micrhystridium |
Micrhystridium sarjeantii
|
Atlantic Ocean |
Cretaceous |
|
Micrhystridium |
Micrhystridium scutospinum
|
France |
Middle Jurassic |
|
Micrhystridium |
Micrhystridium sedecimspinosum
|
Canada(Alberta) |
Late Devonian |
|
Micrhystridium |
Micrhystridium semiapertum
|
Norway |
Middle Cambrian |
|
Micrhystridium |
Micrhystridium seminudum
|
Baltic |
Paleocene |
|
Micrhystridium |
Micrhystridium sericum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium setasessitante
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium shinetonense
|
England |
Tremadocian |
|
Micrhystridium |
Micrhystridium simplex
|
Ohio |
Early Carboniferous |
|
Micrhystridium |
Micrhystridium simplex
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium singulare
|
France |
Late Cretaceous |
|