Protosphaeridium |
Protosphaeridium pusillum
|
Nd |
Riphean |
|
Protosphaeridium |
Protosphaeridium reticulatum
|
Nd |
Middle Riphean |
Early Cambrian |
Protosphaeridium |
Protosphaeridium rigidulum
|
Finland |
Late Precambrian |
Early Cambrian |
Protosphaeridium |
Protosphaeridium rugulosum
|
Spain |
Middle Cambrian |
Late Cambrian |
Protosphaeridium |
Protosphaeridium scabridum
|
Nd |
Riphean |
|
Protosphaeridium |
Protosphaeridium semiclausum
|
Nd |
Nd |
|
Protosphaeridium |
Protosphaeridium spumosum
|
Nd |
Nd |
|
Protosphaeridium |
Protosphaeridium torulosum
|
Nd |
Middle Cambrian |
|
Protosphaeridium |
Protosphaeridium tuberculiferum
|
Nd |
Middle Cambrian |
|
Protosphaeridium |
Protosphaeridium vermium
|
Nd |
Late Proterozoic |
|
Protosphaeridium |
Protosphaeridium vesiculare
|
Nd |
Nd |
|
Protosphaeridium |
Protosphaeridium volkovae
|
India(Madhya Pradesh) |
Late Precambrian |
|
Prototrachysphaeridium |
Prototrachysphaeridium
|
Nd |
Nd |
|
Prototrachysphaeridium |
Prototrachysphaeridium speciosum
|
Nd |
Nd |
|
Prototrachysphaeridium |
Prototrachysphaeridium staplini
|
Nd |
Nd |
|
Psenotopus |
Psenotopus
|
Nd |
Nd |
|
Psenotopus |
Psenotopus chondrocheus
|
Nd |
Silurian |
|