Trachysphaeridium |
Trachysphaeridium magnum
|
Nd |
Riphean |
|
Trachysphaeridium |
Trachysphaeridium maicum
|
Nd |
Riphean |
|
Trachysphaeridium |
Trachysphaeridium minor
|
Nd |
Late Sinian |
|
Trachysphaeridium |
Trachysphaeridium myctum
|
Nd |
Early Cambrian |
|
Trachysphaeridium |
Trachysphaeridium parapertum
|
Nd |
Proterozoic |
|
Trachysphaeridium |
Trachysphaeridium partiale
|
Nd |
Late Proterozoic |
|
Trachysphaeridium |
Trachysphaeridium patellare
sp. nov. |
USSR(Pre-Baltic) |
Arenigian |
|
Trachysphaeridium |
Trachysphaeridium phalanxum
|
Nd |
Late Llandoverian |
|
Trachysphaeridium |
Trachysphaeridium plicatum
|
Nd |
Nd |
|
Trachysphaeridium |
Trachysphaeridium pulchriforme
|
Nd |
Sinian |
Cambrian |
Trachysphaeridium |
Trachysphaeridium raryplicatum
|
Nd |
Ludlovian |
|
Trachysphaeridium |
Trachysphaeridium reticuloideum
|
Nd |
Sinian |
|
Trachysphaeridium |
Trachysphaeridium rigidulum
|
Finland |
Late Precambrian |
Early Cambrian |
Trachysphaeridium |
Trachysphaeridium roblotum
|
USSR(Kirghiz SSR) |
Middle Riphean |
Vendian |
Trachysphaeridium |
Trachysphaeridium robustum
|
Nd |
Sinian |
|
Trachysphaeridium |
Trachysphaeridium rugosum
|
Nd |
Sinian |
|
Trachysphaeridium |
Trachysphaeridium striatum
|
Nd |
Sinian |
|