Acanthodiacrodium |
Acanthodiacrodium
|
Nd |
Nd |
|
Acanthodiacrodium |
Acanthodiacrodium barbullatum
|
USSR |
Cambrian |
|
Aiora |
Aiora
|
Nd |
Nd |
|
Anthatractus |
Anthatractus
|
Nd |
Nd |
|
Anthatractus |
Anthatractus insolitus
|
Canada |
Devonian |
|
Antrosphaera |
Antrosphaera
|
Nd |
Nd |
|
Antrosphaera |
Antrosphaera calloviensis
|
England |
Late Jurassic |
|
Archaeletes |
Archaeletes
|
Nd |
Nd |
|
Archaeodiscina |
Archaeodiscina
|
Nd |
Nd |
|
Archaeofavosina |
Archaeofavosina
|
Nd |
Nd |
|
Archaeohystrichosphaeridium |
Archaeohystrichosphaeridium
|
Nd |
Nd |
|
Archaeopertusina |
Archaeopertusina
|
Nd |
Nd |
|
Archaeosacculina |
Archaeosacculina
|
Nd |
Nd |
|
Aremoricanium |
Aremoricanium
|
Nd |
Nd |
|
Baltisphaeridium |
Baltisphaeridium
|
Nd |
Nd |
|
Baltisphaeridium |
Baltisphaeridium longispinosum
|
Baltic |
Silurian |
|
Ceratocystidiopsis |
Ceratocystidiopsis
|
Nd |
Nd |
|