Polybessurus |
Polybessurus
|
Nd |
Nd |
|
Polybessurus |
Polybessurus bipartitus
|
Norway(Svalbard) |
Proterozoic |
|
Protosphaeridium |
Protosphaeridium
|
Nd |
Nd |
|
Pterospermella |
Pterospermella
|
Nd |
Nd |
|
Pterospermella |
Pterospermella solida
|
Norway(Svalbard) |
Early Cambrian |
|
Pterospermopsimorpha |
Pterospermopsimorpha
|
Nd |
Nd |
|
Pterospermopsimorpha |
Pterospermopsimorpha pileiformis
|
Nd |
Nd |
|
Satka |
Satka
|
Nd |
Proterozoic |
|
Satka |
Satka squamifer
|
Russia |
Proterozoic |
|
Segmentothallus |
Segmentothallus
|
Nd |
Nd |
|
Segmentothallus |
Segmentothallus asperus
|
Russia |
Proterozoic |
|
Siphonophycus |
Siphonophycus
|
Nd |
Nd |
|
Siphonophycus |
Siphonophycus inornatum
|
Norway(Svalbard) |
Proterozoic |
|
Siphonophycus |
Siphonophycus inornatum
|
Russia |
Proterozoic |
|
Siphonophycus |
Siphonophycus robustum
|
Norway(Svalbard) |
Proterozoic |
|
Skiagia |
Skiagia
|
Nd |
Nd |
|
Skiagia |
Skiagia ciliosa
|
Norway(Svalbard) |
Early Cambrian |
|