Hystrichosphaeridium |
Hystrichosphaeridium tuberatum
|
Nd |
Nd |
|
Hystrichosphaeridium |
Hystrichosphaeridium venustum
|
Nd |
Nd |
|
Leiosphaeridia |
Leiosphaeridia ovata
|
Nd |
Nd |
|
Leiosphaeridia |
Leiosphaeridia scrobiculata
|
Nd |
Nd |
|
Lophosphaeridium |
Lophosphaeridium agudisimum
|
Nd |
Nd |
|
Lophosphaeridium |
Lophosphaeridium microspinosum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium alloiteauii
|
Canada |
Middle Devonian |
|
Micrhystridium |
Micrhystridium andrewsii
|
Belgium |
Frasnian |
|
Micrhystridium |
Micrhystridium crassiechinatum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium gordonense
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium guapum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium hamatum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium lobeznum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium paraguaferum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium raspum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium raspum
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium tenuiramusculosum
|
Nd |
Nd |
|