Acanthodiacrodium |
Acanthodiacrodium dentiferum
|
Germany |
Cambrian |
|
Acanthorytidodiacrodium |
Acanthorytidodiacrodium
|
Nd |
Nd |
|
Acanthozonodiacrodium |
Acanthozonodiacrodium
|
Nd |
Nd |
|
Achomosphaera |
Achomosphaera ramulifera
|
France |
Late Cretaceous |
|
Actiniscus |
Actiniscus elegans
|
Nd |
Nd |
|
Actinotheca |
Actinotheca aphroditae
|
Australia(W.Australia) |
Turonian |
|
Aiora |
Aiora fenestrata
|
Australia(W.Australia) |
Senonian |
|
Amphidiadema |
Amphidiadema denticulata
|
Australia(W.Australia) |
Campanian |
|
Angularia |
Angularia viridula
|
USSR(Siberia) |
Late Cretaceous |
|
Anthatractus |
Anthatractus insolitus
|
Canada |
Devonian |
|
Antrosphaera |
Antrosphaera calloviensis
|
England |
Late Jurassic |
|
Applanopsis |
Applanopsis lenticularis
|
Germany |
Jurassic |
Cretaceous |
Aptea |
Aptea polymorpha
|
Germany |
Aptian |
|
Apteodinium |
Apteodinium granulatum
|
Germany |
Aptian |
|
Archaeodiscina |
Archaeodiscina granulata
|
USSR(Estonian SSR) |
Early Cambrian |
|
Archaeofavosina |
Archaeofavosina simplex
|
USSR |
Precambriam |
|
Archaeohystrichosphaeridium |
Archaeohystrichosphaeridium sp
|
Nd |
Nd |
|