Archaeohystrichosphaeridium |
Archaeohystrichosphaeridium cuspidatum
|
USSR(Pre-Baltic) |
Middle Cambrian |
|
Baltisphaeridium |
Baltisphaeridium dentatum
|
Nd |
Nd |
|
Baltisphaeridium |
Baltisphaeridium pungens
|
Nd |
Nd |
|
Baltisphaeridium |
Baltisphaeridium spinosum
|
Nd |
Nd |
|
Buedingiisphaeridium |
Buedingiisphaeridium matutinum
|
Nd |
Nd |
|
Dorsennidium |
Dorsennidium aster
|
France |
Middle Jurassic |
|
Dorsennidium |
Dorsennidium cuspidatum
|
USSR(Pre-Baltic) |
Middle Cambrian |
|
Dorsennidium |
Dorsennidium polyaster
|
Canada(Alberta) |
Late Devonian |
|
Dorsennidium |
Dorsennidium polyaster
|
Nd |
Nd |
|
Dorsennidium |
Dorsennidium polyaster
|
Canada(Alberta) |
Late Devonian |
|
Goniosphaeridium |
Goniosphaeridium connectum
|
Nd |
Nd |
|
Goniosphaeridium |
Goniosphaeridium cuspidatum
|
Nd |
Nd |
|
Goniosphaeridium |
Goniosphaeridium elongatum
|
Nd |
Nd |
|
Goniosphaeridium |
Goniosphaeridium oriens
|
Nd |
Nd |
|
Goniosphaeridium |
Goniosphaeridium radiatusum
|
Nd |
Nd |
|
Goniosphaeridium |
Goniosphaeridium tener
|
Nd |
Nd |
|
Micrhystridium |
Micrhystridium conobrachium
|
Czechoslovakia |
Late Arenigian |
|