Polyedryxium |
Polyedryxium polygonale
|
Nd |
Nd |
|
Polyedryxium |
Polyedryxium primarium
|
Nd |
Early Gedinnian |
Middle Gedinnian |
Polyedryxium |
Polyedryxium prismaticum
|
Nd |
Devonian |
|
Polyedryxium |
Polyedryxium pritulum
|
Nd |
Vendian |
Early Cambrian |
Polyedryxium |
Polyedryxium pruvostii
|
Nd |
Middle Devonian |
|
Polyedryxium |
Polyedryxium pseudopharaone
|
Nd |
Frasnian |
|
Polyedryxium |
Polyedryxium pulchrum
|
Nd |
Middle Devonian |
|
Polyedryxium |
Polyedryxium rabians
|
Nd |
Ludlovian |
Emsian |
Polyedryxium |
Polyedryxium robustum
|
Nd |
Devonian |
|
Polyedryxium |
Polyedryxium sarjeantii
|
Nd |
Middle Cambrian |
|
Polyedryxium |
Polyedryxium simplex
|
Nd |
Middle Devonian |
|
Polyedryxium |
Polyedryxium talum
|
Nd |
Middle Devonian |
Late Devonian |
Polyedryxium |
Polyedryxium tectum
|
Nd |
Devonian |
|
Polyedryxium |
Polyedryxium tetrahedroide
|
Nd |
Silurian |
Devonian |
Polyedryxium |
Polyedryxium tetrapyramidale
|
Nd |
Frasnian |
|
Polyedryxium |
Polyedryxium trifissile
|
Nd |
Onondagan |
|
Polyedryxium |
Polyedryxium venustum
|
Nd |
Middle Devonian |
|