Dorsennidium |
Dorsennidium vesiculospinum
|
Nd |
Nd |
|
Dorsennidium |
Dorsennidium vesiculospinum
|
Nd |
Nd |
|
Dorsennidium |
Dorsennidium yunnanense
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium decollatum
|
Australia(W.Australia) |
Middle Devonian |
Late Devonian |
Micrhystridium |
Micrhystridium kufferathii
|
Belgium |
Late Devonian |
|
Micrhystridium |
Micrhystridium multiangulare
|
USSR(Russia) |
Early Ordovician |
|
Micrhystridium |
Micrhystridium sedecimspinosum
|
Canada(Alberta) |
Late Devonian |
|
Micrhystridium |
Micrhystridium singulare
|
France(Aisne) |
Late Cretaceous |
|
Palacanthus |
Palacanthus multiangulare
|
USSR(Russia) |
Early Ordovician |
|
Palacanthus |
Palacanthus signum
|
France(Finistere) |
Middle Devonian |
|
Palacanthus |
Palacanthus stelligerum
|
Canada |
Middle Devonian |
|
Palacanthus |
Palacanthus stelligerum
|
Spain |
Late Silurian |
|
Palacanthus |
Palacanthus stelligerum
|
France(Finistere) |
Middle Ordovician |
|
Palacanthus |
Palacanthus stelligerum
|
Canada |
Middle Devonian |
|
Polygonium |
Polygonium kufferathii
|
Belgium |
Late Devonian |
|
Polygonium |
Polygonium parvum
|
USSR(Russia) |
Middle Cambrian |
|
Polygonium |
Polygonium sedecimspinosum
|
Canada(Alberta) |
Late Devonian |
|