Micrhystridium |
Micrhystridium rarispinum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium rectangulare
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium recurvatum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium recurvatum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium recurvatum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium recurvatum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium recurvatum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium reticulatum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium rhopalicum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium robustum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium roquestii
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium sannemannii
|
Canada |
Middle Devonian |
|
Micrhystridium |
Micrhystridium scutospinum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium sericum
|
Canada(Ontario) |
Early Devonian |
|
Micrhystridium |
Micrhystridium setasessitante
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium shinetonense
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium singulare
|
Nd |
Nd |
|