Micrhystridium |
Micrhystridium varians
|
France(Ille-et-Vilaine) |
Early Cambrian |
|
Micrhystridium |
Micrhystridium vigintispinum
|
Nd |
Silurian |
|
Micrhystridium |
Micrhystridium vulgare
|
Nd |
Silurian |
|
Micrhystridium |
Micrhystridium williereae
|
Belgium |
Tarannon |
|
Micrhystridium |
Micrhystridium williereae
|
Georgia |
Tarannon |
|
Micrhystridium |
Micrhystridium williereae
|
Pennsylvania |
Late Llandoverian |
|
Micrhystridium |
Micrhystridium williereae
|
Alabama |
Tarannon |
|
Micrhystridium |
Micrhystridium williereae
|
Spain |
Ludlovian |
Early Gedinnian |
Micrhystridium |
Micrhystridium williereae
|
Belgium |
Late Llandoverian |
Late Wenlockian |
Micrhystridium |
Micrhystridium williereae
|
Spain |
Middle Gothlandian |
Late Gothlandian |
Micrhystridium |
Micrhystridium williereae
|
Libya |
Middle Gothlandian |
|
Micrhystridium |
Micrhystridium williereae
|
Pennsylvania |
Early Llandoverian |
Tarannon |
Neoveryhachium |
Neoveryhachium
|
Nd |
Llandoverian |
Early Gedinnian |
Neoveryhachium |
Neoveryhachium carminae
sp. nov. |
Georgia |
Tarannon |
|
Neoveryhachium |
Neoveryhachium carminae
sp. nov. |
Pennsylvania |
Late Llandoverian |
|
Neoveryhachium |
Neoveryhachium carminae
sp. nov. |
Alabama |
Tarannon |
|
Neoveryhachium |
Neoveryhachium carminae
sp. nov. |
Spain |
Ludlovian |
Early Gedinnian |