Palaeotetradinium |
Palaeotetradinium hyalodermum
|
Nd |
Nd |
|
Peregrinixia |
Peregrinixia pyramidispinosa
|
Bulgaria |
Late Jurassic |
|
Peregrinixia |
Peregrinixia radiata
|
Atlantic Ocean |
Late Albian |
|
Podolina |
Podolina antiqua
|
USSR(Baltic) |
Early Cambrian |
|
Podolina |
Podolina minuta
|
USSR |
Vendian |
|
Polyedryxium |
Polyedryxium belgicum
|
Belgium |
Late Devonian |
|
Polygonium |
Polygonium
|
Czechoslovakia |
Arenigian |
|
Polygonium |
Polygonium acuminosum
|
Morocco |
Ordovician |
|
Polygonium |
Polygonium aleum
|
Canada(Newfoundland) |
Middle Cambrian |
|
Polygonium |
Polygonium aster
|
Ohio |
Late Devonian |
|
Polygonium |
Polygonium aster
|
France |
Middle Jurassic |
|
Polygonium |
Polygonium baltoscandium
|
Sweden |
Early Cambrian |
|
Polygonium |
Polygonium breviradiatum
|
USSR(Estonian SSR) |
Middle Ordovician |
|
Polygonium |
Polygonium celestum
|
Nd |
Tarannon |
Early Ludlovian |
Polygonium |
Polygonium christianii
|
Sweden |
Middle Ordovician |
|
Polygonium |
Polygonium clarum
|
Spain |
Early Cambrian |
Ordovician |
Polygonium |
Polygonium conjunctum
|
Sweden |
Middle Ordovician |
|